BELTS AND CHAINS 8.

Flat leather being not recommended for use in a speed

in excess of ____ fpm
1. It is Ideal for maximum quietness in sprocket drive a. 3600
operation to choose _____ or more teeth. b. 4800
a. 25 c. 6000
b. 26 d. All of these
c. 27
d. 28 9. V-belts operate efficiently at speed of about
a. 4500 fpm
2. It is recommended for high speed application that the b. 4400 fpm
minimum number of teeth in small sprocket should be c. 4200 fpm
a. 12 to 20 d. 3600 fpm
b. 18 to 24
c. 16 to 32 10. It is advised that in rubber belts application mounting,
d. 14 to 28 it should have an initial tension of ___ inch/ply
a. 18 to 24
3. Consider a maximum safe center distance of sprockets b. 15 to 20
should be _____ pitches. Very long center distance c. 12 to 15
caused catenaries tension in the chain. d. 10
a. 70
b. 80 11. In shear pin or breaking pin design. We may use the
c. 90 data experienced by Link-belt for 1/8-inch pins and the
d. 100 breaking stress is ______ ksi.
a. 40
4. The recommended lubricant for the chain drive b. 55
operation is c. 50
a. SAE 4140 d. 48
b. Petroleum oil
c. Moly slip 12. A type of V-belts to use in a driving pulley with speed
d. Heavy grease of 360 rpm and transmitting 5 hp
a. Type C belts
5. Type of leather belt being applied with waterproof b. Type B belts
cement is called c. Type A belts
a. Combination of oak/mineral tanned d. Type D belts
b. Oak tanned
c. Mineral tanned 13. Belt slip may take place because of
d. All of the above a. Loose load
b. Heavy belt
6. What type of leather belting should be used at an c. Driving pulley too small
ambient temperature above 140 deg F and possible acid d. All of the above
liquid coming in
contact with the belt? 14. A single ply leather belt running at a belt velocity of
a. Mineral tanned 300 ft/min is like to transmit ______ per inch of width
b. Combination of oak a. 2.5 hp
c. Oak tanned b. 3.0 hp
d. None of these c. 4.0 hp
d. 5.0 hp
7. It is recommended not to have a direct drive sprockets
if the ratio 15. What is the density of a leather belt?
of their teeth exceeds ______ use two or more step a. 0.035 lb/in3
combination. b. 0.0253 lb/in3
a. 10 times c. 0.046 lb/in3
b. 8 times d. 0.074 lb/in3
c. 5 times
d. 6 times
16. What is the density of flat rubber belt material? c. 73 lb/in. of width
a. 0.055 lb/in3 d. 80 lb/in. of width
b. 0.045 lb/in3
c. 0.0725 lb/in3 25. The recommended net belt pull for rubber belt is
d. 0.0726 lb/in3 a. 11.34 lb/ply per inch of width
b. 13.75 lb/ply per inch of width
17. The breaking strength of oak tanned belting varies c. 16.35 lb/ply per inch of width
from 3 to more than d. 20.34 lb/ply per inch of width
a. 5 ksi
b. 6 ksi 26. If two intersecting shafts are to be belt connected,
c. 7 ksi how many guide pulley is used
d. 8 ksi a. 1
b. 2
18. If the ends are joined by wire lacing with machine, the c. 3
usual efficiency of joint is d. 4
a. 75%
b. 85% 27. Two shafts at right angle to each other may be
c. 88% connected by the ________ arrangement
d. 100% a. Half turn
b. Three-fourths turn
19. The tension in the belt due to centrifugal force c. One turn
increases rapidly above d. Quarter turn
a. 2500 fpm
b. 3000 fpm 28. It offers long life, high efficiency, and low cost and low
c. 3500 fpm maintenance.
d. 4000 fpm a. Flat belt
b. V-Belt
20. Experience suggests that the most economical designs c. Tooth belt
are obtained for a belt speed of d. All of the above
a. 2000 to 3000 fpm
b. 3000 to 4000 fpm 29. It is used to connect pulleys or to convey materials by
c. 4000 to 4500 fpm transmitting motion and power.
d. 4000 to 4000 fpm a. rope
b. wires
21. For leather belts, recommended speed is c. belt
a. 2000 to 3000 fpm d. flat
b. 4000 to 5000 fpm
c. 6000 to 7500 fpm 30. A crossed belt wider than _____ inches should be
d. 7000 to 8000 fpm avoided.
a. 7
22. For fabric belts, recommended speed is b. 8
a. 2000 to 3000 fpm c. 9
b. 2000 and more fpm d. 10
c. 3000 to 4000 fpm
d. 4000 to 4500 fpm 31. If the pulley ratio is 3:1 or more, the reduction should
be
23. On high speed centrifugal blowers, it has been a. 25%
observed that the arc of contact reduced from 180 deg at b. 50%
rest to _____ in motion c. 75%
a. 90 deg d. 95%
b. 95 deg
c. 100 deg 32. The advantage of flat belting is that
d. 110 deg a. It can be used with high speed drives
b. It can be used in dusty and abrasive environments
24. The recommended initial tension of the belt is c. It allows long distances between shafts
a. 75 lb/in. of width d. All of the above
b. 71 lb/in. of width
33. The best leather has an ultimate strength of about 41. The minimum number of teeth on the smaller
a. 3000 psi sprocket for high speeds is
b. 4000 psi a. 19
c. 5000 psi b. 21
d. 6000 psi c. 23
d. 25
34. Initial tensions should range from ___ for leather belts
and 10 to 12 lb/ply per inch of width for rubber belts. 42. For maximum quietness, use sprockets with ____ or
a. 200 to 240 psi more teeth.
b. 220 to 260 psi a. 21
c. 240 to 280 psi b. 23
d. 260 to 300 psi c. 25
d. 27
35. The density of a balata belt is
a. 0.031 lb/in3 43. For the average application a center distance
b. 0.042 lb/in3 equivalent to ____ pitches of chain represents good
c. 0.051 lb/in3 practice
d. 0.061 lb/in3 a. 10 to 20
b. 20 to 30
36. In the selection of the proper belt, it is not considered c. 30 to 50
good practice to use single ply leather belts more than
d. 40 to 60
_____ wide
a. 6 in 44. The tension ratio of flat belt is
b. 7 in a. 2
c. 8 in b. 3
d. 9 in c. 4
d. 5
37. According to the Goodrich company, the permissible
net belt pull is _____ that it gives a simple means for 45. The tension ratio of V belt is
quick estimation. a. 2
a. 13.75 lb/ply per inch of width b. 3
b. 15.75 lb/ply per inch of width c. 4
c. 16.75 lb/ply per inch of width d. 5
d. 17.75 lb/ply per inch of width
46. Balata belt is about _____ stronger than rubber.
38.Which type of chain is used in motorcycle? a. 10%
a. Bush roller b. 15%
b. Pintle c. 20%
c. Silent d. 25%
d. None of the above
47. The coefficient of friction between the belt and the
39 The minimum number of teeth on the smaller sprocket pulley for leather belt running on steel pulley is
for low speeds is a. 0.1
a. 12 b. 0.2
b. 14 c. 0.3
c. 16 d. 0.5
d. 18
48. The capacity of a crossed belt should be reduced to
40. The minimum number of teeth on the smaller _____ that of an open belt
sprocket for a. 25%
moderate speeds is b. 50%
a. 15 c. 60%
b. 17 d. 75%
c. 19
d. 21 49. What is the usual factor of safety used with leather
belts?
a. 3
b. 5 a. Block brake
c. 7 b. Band brake
d. 10 c. Clutch
d. Centrifugal brake
50. In practice it is found that arcs less than _____ require
High belt tensions. 8. The brake lining operating at temperature ______,
a. 155 deg sintered mixtures containing ceramics are used.
b. 165 deg a. 750 F to 1000F
c. 175 deg b. 560 F to 900F
d. 180 deg c. 800F to 1200F
d. 400F to 789F
BRAKES AND CLUTCHES
9. Hydrodynamic brakes is the major type of
1. A shaft used to connect or disconnect at will is called a. Air brake
a. Clutch b. Fluid brake
b. Bearing c. Electric brake
c. Brake shaft d. Spot brake
d. Lock shaft
10. Types of brakes that are capable of stopping the
2. The frictional forces depend on coefficient of friction motion of a machine member as well as retarding its
and motion
a. Torque a. Electrical brake
b. Weights of object b. Fluid brake
c. Normal force c. Air brake
d. Moment d. Mechanical brake
3. Friction devices used to regulate the motion of bodies 11. It is considered as the simplest type of mechanical
and with clutches brake
a. Rollers a. Differential brake
b. Brakes b. Block brake
c. Babbitt c. Band brake
d. Holders d. Brake shoe
4. The part of the total frictional energy that is stored in
12. The friction devices used to connect shafts
the brake parts, principally in the drum or disk has been a. Brakes
variously estimated b. Clutches
at _______ c. Spring
a. 56% up d. Holder
b. 86% up
c. 90% up 13. A clutch that has a disadvantage of heavier rotary
d. 75% up masses
a. Multiple disc clutch
5. The part of an automobile disc clutch that presses b. Disc clutch
against the flywheel is referred to as c. Cone clutch
a. Contact plate d. None of these
b. Friction plate
c. Pressure plate 14. The overrunning clutch
d. Sliding plate a. Should be oiled
b. Should be repacked with grease
6. The brake capacity to absorb energy is known as c. Cannot be lubricated
a. Energy d. Contains no lubricant
b. Resistance brake
c. Power 15. The overrunning clutch
d. Braking torque a. Transmits cranking force to the engine flywheel
b. Is one-way clutch
7. If the band wraps partly around the brake wheel or c. Prevents the engine flywheel from driving the starting
drum an brake action is obtained by pulling the band tight
onto the wheel. This type of brake is known as
motor c. Clutch is faulty
d. All of the above d. All of the above
16. Clutch, gear box, differential etc, are the parts of 25. What faults develop in the brakes?
a. Brakes do not work properly
a. Charging system b. Brakes do not disengage
b. Transmission system c. Brakes makes noise
c. Cooling system d. All of the above
d. None of these
26. Which of the following types of brakes are also
17. In motor vehicles, it is very common practice to use a changed while replacing brake lining?
a. Multiple clutch a. Brake shoes
b. Hydraulic clutch b. Shoe rivets
c. Cone clutch c. Shoe spring
d. Single plate clutch d. Block brake
18. The clutch finger is pushed by 27. Power brakes require _______ power
a. Clutch fork
a. Equal
b. Clutch b. Less
c. Clutch bearing c. More
d. None of these
d. pulsating
19. A hydraulic clutch doesn’t incorporate a 28. What type of oil is used in the hydraulic brake
a. Clutch plate system?
b. Oil plate a. Engine oil
c. Vacuum plate b. Gear oil
d. None of these c. Brake oil
20. The lining of a brake shoe d. Clutch oil
a. Can be changed 29. The principal parts of a hydraulic brake system are the
b. Cannot be fitted master cylinder and the
c. Can be fitted with spring a. Multi cylinder
d. None of these b. Wheel cylinder
21. Due to air effect, the hydraulic brakes become c. Brake wire
a. More effective d. Brake shoe
b. Ineffective 30. In the mechanical brake system the main function is
c. Possible of
d. None of these a. Spring
22. The efficiency of hydraulic braking system is b. Cam
a. About 90 percent c. Shoe adjuster
b. 60-80 percent d. Shoe rivets
c. 50-60 percent 31. In motor vehicles, there is a _______ in addition of
d. 40-50 percent foot brake
23. The SAE recommends an angle of _____ for cone a. Hand brake
clutches faced with leather or asbestos or having cork b. Hydraulic brake
inside. c. Mechanical brake
a. 7.5” d. Band brake
b. 9.5” 32. Which of the following are also used in the suspension
c. 12.5” system?
d. 14.5” a. Stock absorbers
24. Why does clutch creates noise? b. Brake shoes
a. Clutch release bearing is either dry or defective c. Cams
b. Clutch spring is broken d. Block brakes
33. There are ______ plates in a multi plate clutch c. Band Clutch
a. More than one d. Band brake
b. Less than one
c. More than ten 42. The effectiveness of the brake may greatly decrease
d. Less than one shortly after it begins to act continuously, a phenomenon
called
34. Hydraulic clutches are used in _____ vehicles a. Creep
a. Costly b. Pressurized
b. Foreign made c. Fade
c. Cheap d. Worn-out
d. Affordable
43. Type of brake under the category of power brake is
35. Which of the following is mounted inside the clutch? known as
a. An engine a. Servo brake
b. Gear box propeller shaft b. Band brake
c. Both the rear axle c. Differential brake
d. All of the above d. Brake shoe
36. Which clutch is suitable for mine hoists and other 44. Clutches which are designed to transmit torque for
services where heavy loads are accompanied by severe one direction of rotation of the driver and then free
shock? wheel or transmit essentially no torque when the
a. Band clutch direction of the driver rotation is reversed
b. Block clutch a. Magnetic clutches
c. Centrifugal b. Trip clutches
d. Expanding ring clutch c. Overrunning clutches
d. Slip clutches
37. It is used to protect a machine in case of jamming and
for overload protection of motors and engine 45. The reason for noise at the time of engaging brake
a. Dry fluid clutch a. Back plate being loose or bent
b. Magnetic clutch b. Brake shoe being loose or bent
c. Eddy clutch c. Brake drum could be defective
d. Slip clutch d. All of the above
38. Refers to the simplest type of brakes 46. When the vehicle runs brake drum becomes hot
a. Differential brakes because of friction of the shoe. This fault is known as
b. Block brakes _______
c. Band brakes a. Brake lining
d. Brake shoe b. Brake winding
c. Back plate
39. The practical length of shoe is limited to about d. None of the above
a. 75
b. 90
c. 120 47. The maintenance of mechanical brake is
d. 180 a. Expensive
b. Economical
40. If the angle of contact is _____, the pressure between c. Costly
the brakes shoe and the drum cannot be considered d. None of the above
uniform.
a. Less than 45 deg 48. What is the most common defect of clutch?
b. Less than 60 deg a. Slip of the clutch
c. Greater than 60 deg b. Clutch does not disengage properly
d. Greater than 120 deg c. Clutch creates noise
d. All of the above
41. It is used to stop the motion of a moving object
a. Clutch 49. The act of keeping some pressure on the clutch pedal
b. Brakes at the time of driving is known as
a. Hydraulic clutch
b. Slip of the clutch a. bronze
c. Riding on clutch b. brass
d. Clutch adjustment c. duralumin
d. All of these
50. Which of the following shortcomings in the cone
clutch because of which the clutch is not used? 8. If a set of spur gears are made, installed and lubricated
a. Clutch slips quickly properly, they normally may be subjected to failures like
b. It occupies more space _______
c. Adjustment has to be done early a. Tooth spalling
d. All of the above b. Tooth penning
c. pitting
GEARS A d. shearing
1.The minimum recommended worm pitch diameter is ¼ 9. Which of the following is an example of rectilinear
in. and the maximum is translation?
a. 1 ¾ in. a. Locomotive wheels
b. 2 ¾ in. b. Rack gear
c. 3 in. c. Piston of an engine
d. 2 in. d. Jack
2. Vertex distance is a term used in _______gearing. 10. For economical in the manufacturing large worm
a. Spiral gears, the following materials are usually applied:
b. Worm a. Bronze rim with cast steel spider
c. Bevel b. Cast iron rim with bronze spider
d. Zerol c. Cast steel rim with brass spider
d. Alloyed aluminum rim with cast iron spider
3. The arc of action to circular pitch or length of action to
base pitch. 11. Intermediate gear is also called ____ gear in a gear
a. Approach train arrangement.
b. Contact ratio a. Idler
c. Arc of action b. Pinion
d. Arc of approach c. Third Gear
d. Mounted Gear
4. Recommended hardness of pinion for helical
/herringbone gear tooth should be ________BHN point to 12. The distance a helical gear or worm would tread along
sustain life. its axis in one revolution if it were free to move axially is
a. 50-58 called
b. 48-65 a. Lead
c. 40-50 b. Thread
d. 30-60 c. Pitch
d. Land
5. In designing gears for power transmission consider an
efficiency of ________as recommended. 13. Range of helix angle on helical gear is _____
a. 96 % or more a. Less than 18
b. 89 % or more b. 15-25
c. 85 % or more c. 20-35
d. 98 % or more d. 35-40
6. The surface of the gear between the fillets of adjacent 14.What will be the effect in bushing gears without
teeth is called: backlash?
a. Bottom land a. Jamming
b. Flank b. Overheating
c. Top land c. Overload
d. Flank of tooth d. All of these
7. Bevel gears subjected to corrosion and tightly loaded 15. The amount by which the width of a tooth space
are usually made of exceeds the thickness of the engaging tooth on the pitch
circles. 23. The distance of the tooth, which is equal to the sum
a. Backlash of the addendum and dedendum is known as
b. Clearance a. Full Depth
c. Undercut b. Whole Depth
d. Chordal thickness c. Working Depth
d. Dedendum
16. Height of tooth above pitch circle or radial distance
between pitch circle and top land of the tooth is called 24. It is used to change rotary motion to reciprocating
a. Top tooth motion
b. Addendum a. Helical Gear
c. Land b. Rack Gear
d. Hunting c. Working Depth
d. Dedendum
17. In involutes teeth, the pressure angle is often defined
as the angle between the line of action and the line of 25. Tooth measured along the chord at the pitch circle is
tangent to the pitch circle. It is termed as known as
a. Helix angle a. Flank
b. Age of recess b. Face Width
c. Angle of obliquity c. Width of Face
d. Arc of action d. Chordal Thickness
18. The reciprocal of a diametral pitch or the ratio of pitch 26. _______________ is the difference of addendum,
diameter to a number of teeth is called which is equivalent to the whole depth less working
a. Lead depth.
b. Module a. Fillet Space
c. Involute b. Fillet Radius
d. Clearance c. Clearance
d. Backlash
19. For evenly distributed and uniform wear on each
meshing gear tooth the ideal design practice is to 27. For moderate speed of mating gears, the ideal ratio
consider a contact is:
a. Wear resistance alloy addition to tooth gear a. 1.25 – 4.00
b. Heat treatment of the gears b. 1.20 – 1.45
c. Hardening of each c. 1.00 – 1.30
d. Hunting tooth addition d. 1.35 – 1.45
20. _____ used to transmit power at high velocity ratios 28. The distance of helical gear or worm would thread
between non-intersecting shafts that are usually but not along its axis in one revolution if it were to move axially is
necessarily at right angle. called
a. Helical Gear a. Length of Action
b. Bevel Gear b. Length of Contact
c. Worm Gear c. Land
d. Spiral Gear d. Lead
21. In gear design, the ratio of the pitch diameter in 29. Hypoid gear is a special type of gear like
inches to the number of teeth is called a. Worm Gear
a. Module b. Spur Gear
b. Diametral Pitch c. Herring Gear
c. English Module d. Bevel Gear
d. Circular Pitch
30. What type of gear is used for high – speed operation?
22. The concave portion of the tooth profile where it joins a. Helical
the bottom of the tooth fillet curve is called b. Spur
a. Fillet Curve c. Bevel
b. Fillet Radius d. Worm
c. Bottom Depth
d. Fillet
 parts
c. Avoid obstruction
d. Necessary to lessen casting weigth
31. In pair of gears, ____________ is the plane
38. A type of gear tooth cut inside a cylinder or ring is
perpendicular to the axial plane and tangent to the pitch termed as
surface. a. Rack Gear
a. Pitch b. Ring Gear
b. Pitch Plane c. Miter Gear
c. Pitch Circle d. Internal Gear
d. Pitch Point
39. The length of arc between the two sides of a gear
32. What type of gear, which can transmit power at a tooth on the pitch circle.
certain angle? a. Circle Thickness
a. Helical Gear b. Axial Plane
b. Worm Gear c. Helix Angle
c. Bevel Gear d. Chordal Curve
d. Herringbone Gear
40. Which of the following materials to be utilized to
33. __________ commonly used in parallel shaft reduce cost in the manufacture of large worm gears?
transmission especially when a smooth continuous action a. Alloyed Aluminum
is essential as in high b. Bronze rim with cast iron spider
speed drives up to 12 000 fpm. c. Cast iron rim with bronze spider
a. Bevel Gear d. All of these
b. Herringbone Gear
c. Spur Gear 41. A circle bounding the bottom of the teeth.
d. Helical Gear a. Addendum Circle
b. Addendum Cylinder
34. The hardness of helical and herringbone gear teeth c. Pitch Circle
after heat treatment is 210 to 300 Brinell Hardness for d. Dedendum circle
gear and pinion is at
____________. 42. _____________ is one in which angle is 900 that is the
a. 360 Brinell Minimum pitch
b. 400 Brinell Maximum cone has become a plane.
c. 340 – 350 normal a. Crown Gear
d. All of these b. Angular Gear
c. Miter Gear
35. The path of contact involute gears where the d. Spiral Gear
force/power is actually transmitted. It is a straight
imaginary line passing through the pitch point and 43. A _____________ is formed by elements which are
tangent to the base circle is known as perpendicular to the elements of the pitch cone at the
____________. large end.
a. Principal Reference Plane a. Cone Distance
b. Pitch Point b. Back Cone
c. Front Angle c. Root Cone
d. Line of Action d. Cone Center
36. ____________ is the angle of the base cylinder of an 44. A bevel gear of the same size mounted on a shaft at
involute gear that the tooth makes with the gear axis. 900 is
a. Base Helix Angle called
b. Pressure Angle a. Crown Gear
c. Arc of Recess b. Spur Gear
d. Arc of Approach c. Angular Gear
d. Miter Gear
37. Fillet radius in machine parts is usually introduced to:
a. Improve the look of the path 45. Gearing in which motion or power that is transmitted
b. Reduce concentration of stress and extend life of the depends upon the friction between the surfaces in
contact. b. Working depth includes clearance
a. Bevel Gears c. Tooth outline are always cycloidal curves
b. Spur Friction Wheels d. Tooth outlines are usually involute curves
c. Evans Friction Cones
d. Friction Gearing 4. __________ is a kind of gear used to transmit motion
from one shaft to another shaft at an angle to the first.
46. Wheels are sometimes used for the transmission of a. Worm Gear
high power when an approximately velocity ratio is b. Bevel Gear
desired is called: c. Helical Gear
a. Bevel Cones d. Spur Gear
b. Friction Gearing
c. Spur Friction Wheels 5. A circle coinciding with a tangent to the bottom of the
tooth spaces.
d. Evans Friction Wheels
a. Pitch Circle
47. The frustums of two cones used in a manner to permit b. Root Circle
a variation of velocity ratio between two parallel shafts c. Base Circle
are called d. Outside Circle
a. Evans Friction Cones
b. Bevel Cones 6. A circle the radius of which is equal to the distance
c. Spherical Cones from the gear axis to the pitch point.
a. Pitch Circle
d. Friction
b. Root Circle
48. If gears cannot parallel shafts, they are called c. Base Circle
a. Cycloidal Gears d. Outside Circle
b. Helical Gears
c. Spur Gears 7. Ratio of pitch diameter to the number of teeth.
d. Toothed Gears a. Diametral Pitch
b. Module
49. ____________ is used to transmit power between c. Contact Ratio
shafts axis of which it intersect. d. Helical Overlap
a. Spur Gears
b. Bevel Gears 8. A kind of gear used for heavy duty works where a large
c. Helical Gears ratio of speed is required and are extensively used in
d. Straight Bevel Gears speed reducer is known as
a. Worm Gear
50. The space between the adjacent teeth is called b. Spiral Gear
a. Tooth c. Helical Gear
b. Flank d. Bevel Gear
c. Backlash
d. Width 9. The ratio of the number of teeth to the number of mm
of pitch diameter equals number of gear teeth to each
GEARS B mm of pitch diameter.
a. Diametral Pitch
1. Tooth width measurement along the chord at the pitch b. Module
circle c. Circular Pitch
a. Chord Space d. English Module
b. Chord Clearance
c. Chordal Thickness 10. The depth of tooth space below the pitch circle.
d. Chordal Length a. Dedendum
b. Working Depth
2. Herringbone gears are gears which c. Full Depth
a. Do not operate parallel shafts d. Tooth Depth
b. Have a line contact between the teeth
c. Tend to produce and thrust on the shafts 11. The total depth of a tooth space equal to the
d. Consists of two left-handed helical gears addendum plus dedendum
a. Full Length
3. In usual spur gearing the b. Working Depth
a. Pitch circle and the base circle are the same
c. Whole Depth c. Diametral Pitch
d. Dedendum d. Circular Pitch
12. A circle coinciding with a tangent to the bottom of the 20. The number of teeth per inch of pitch diameter and
tooth space. which gives some indications of the size of the gear teeth.
a. Root Circle a. Module
b. Pitch Circle b. Pitch Circle
c. Addendum Circle c. Diametral Pitch
d. Dedendum d. Circular Pitch
13. The diameter of a circle coinciding with the top of the 21. An imaginary circle passing through the points at
teeth of an internal gear which the teeth of the meshing gears contact each other.
a. Pitch Diameter a. Pitch Circle
b. Root Diameter b. Addendum Circle
c. Internal Diameter c. Dedendum Circle
d. Central Diameter d. Base Circle
14. A gear with teeth on the outer cylindrical surface. 22. If the lead angle of a worm is 22.5 degrees then the
a. Outer Gear helix angle will be ___________.
b. External Gear a. 45 degrees
c. Spiral Gear b. 67.5 degrees
d. Helical Gear c. 22.5 degrees
d. 90 degrees
15. Addendum of a cycloidal gear tooth.
a. Cycloid 23. Refers to the smallest wheel of a gear train.
b. Epicycloid a. Pinion
c. Straight Rack b. Idler
d. Involute c. Spur
d. Driver
16. When meshed with a gear, it is used to change rotary
motion to reciprocating motion is 24. Spiral gears are suitable for transmitting
a. Gear Shaft a. Small Power
b. Gear Tooth b. Any Power
c. Gear Rack c. Huge Power
d. Gear Motor d. Pulsating Power
17. The portion of the gear tooth space that is cut below 25. Zero axial thrust is experienced in
the pitch circle and is equal to the addendum plus the a. Helical Gears
clearance b. Herringbone Gears
a. Top Root c. Spiral Gears
b. Dedendum d. Bevel Gears
c. Addendum
d. Tooth Space 26. Bevel gears are used to transmit rotary motion
between two shafts whose axes are
18. The portion of a gear tooth that projects above or a. Parallel
outside the pitch circle. b. Non – coplanar
a. Top Relief c. Non – intersecting
b. Dedendum d. None of the above
c. Addendum
d. Tooth Space 27. According to law of gearing
a. Teeth should be involute type
19. The distance from the center of one tooth of a gear to b. Clearance between mating teeth should be provided
the center of the next consecutive tooth measured on the c. Dedendum should be equal to 1.57M
pitch. d. None of these
a. Circular Pitch
b. Module
28. Gears for watches are generally manufactured by c. Pressure load
a. Die casting d. Tangential load
b. Machining on hobber
c. Machining on a gear shaper 36. The service factor of a gear may be taken as
d. Stamping ______________ if an electric motor drives a centrifugal
blower.
29. In case of gears the addendum is given by a. 1
a. One module b. 2
b. 2.157 x module c. 3
c. 1.57 x module d. 4
d. 1.25 / module
37. The kind of wear occurs because of a fatigue of the
30. In case of cross helical worm the axes of the two surface material as a result of high contact stresses is
shafts are known as
a. Parallel a. Slotting
b. Intersecting b. Pitting
c. Non – parallel c. Involuting
d. Non – parallel / non - intersecting d. curving
31. In case of spur gears the flank of the tooth 38. ___________ is caused by foreign matter such as grit
a. The part of the tooth surface lying below the pitch or metal particles or by a failure of the oil film at low
surface speed
b. The curve forming face and flank a. Suction
c. The width of the gear tooth measured axially along the b. Scoring
pitch surface c. Abrasion
d. The surface of the top of the tooth d. Corrosion
32. A reverted gear train is one in which 39. ___________ occurs when the oil film fails but in this
a. The direction of rotation of first and last gear is case the load and speed are so high that the surface
opposite metal is melted and metal sis smeared down the profile.
b. The direction of rotation of first and last gear is the a. Abrasion
same b. Corrosion
c. The first and the last gear are essentially on separate c. Spalling
but parallel shafts d. Scoring
d. None of the above
40. ___________ is a surface fatigue of greater extent
33. For best running conditions of gear, the contact ratio than pitting that is the flakes are much larger. This type of
should be about failure occurs in surface-hardened teeth.
a. 1.25 to 1.40 a. Abrasion
b. 1.20 to 1.45 b. Corrosion
c. 1.34 to 1.56 c. Spalling
d. 1.62 to 1.45 d. Scoring
34. The _____________ full depth teeth have the 41. Buckingham says that mating phenolic gears with
advantages of the greater capacity and less interference steel of BHN less than ______________ leads to excessive
trouble. abrasive wear.
a. 14.5 0 a. 200
b. 24 0 b. 300
c. 20 0 c. 400
d. 30 0 d. 500
35. _____________ is the average tangential force on the 42. _________ is the extra tooth in gear, which is use to
teeth distribute the wear more evenly.
is then obtained from the horsepower. a. Hunting Tooth
a. Total load b. Tooth Profile
b. Separation load c. Dummy Tooth
d. Add Tooth
43.The length of the hub should not be a. 210 and 300 Brinell
made___________ the face width of the gear. b. 147 and 300 Brinell
a. less than c. 230 and 320 Brinell
b. equal d. 220 and 320 Brinell
c. greater than
d. none of these GEARS C
1. Helical Gears mounted on non-parallel shafts
44. ______________ is a gear that has teeth cut are called___________
on the inside of the rim instead of on the a. Open gear
outside. b. Crossed helical gear
a. External gear c. Closed helical gear
b. Involute gear d. Herringbone gear
c. Stub Gear
d. Annular gear 2. _____________ is used to connect
intersecting shafts, usually but not necessarily
45. To eliminate fouling, let the minimum at 90 degrees.
difference in tooth numbers between the a. Bevel gear
internal gear and pinion be ____ for 14.5 deg b. Helical gear
involute full depth. c. Spur gear
a. 10 teeth d. Worm gear
b. 12 teeth
c. 14 teeth 3. Bevel gear teeth are built with respect to
d. 16 teeth a______ rather than to pitch cylinder as in
spur gears.
46. The loss pair of spur, helical or bevel gears in a. Pitch pedal
an ordinary train should not exceed b. Pitch profile
a. 4% c. Pitch cone
b. 6% d. Cylinder
c. 2%
d. 5% 4. Refers to the length of pitch cone in a bevel
gear.
47. The typical helix angle ranges from a. Cone center
________ to __________. b. Lead
a. 10 deg to 12 deg c. Center distance
b. 12 deg to 15 deg d. Pitch
c. 14 deg to 20 deg
d. 15 deg to 25 deg 5. Refers to the cone that is formed by the
elements of the top lands.
48. _____ is the advance of the tooth in the face a. Face cone
width divided by circular pitch. b. Root face
a. Face contact ratio c. Dial face
b. Speed ratio d. Pitch Face
c. Profile ratio
d. Advance ratio 6. The cone formed by the elements of bottom
lands.
49. The distance between the teeth measured a. Face cone
on the pitch surface along a normal to the b. Root cone
helix. c. Back cone
a. Lead d. Rake cone
b. Lead angle
c. Normal Circular pitch 7. An imaginary cone whose elements are
d. Pitch perpendicular to the pitch cone elements at
the large end of the tooth.
50. The hardness of helical and herringbone a. Front cone
teeth cut after heat treatment will generally b. Side cone
fall between the limits of
____________________.
c. Rear cone they are called______________.
d. Back cone a. Mold Gear
b. Helix gear
8. _____________ is one whose tooth profiles c. Miter gear
consist of straight elements that converge to a d. Tangent gear
point at the cone center.
a. Circular bevel gear 16. The use of gearbox provides
b. Straight bevel gear a. Gear leverage
c. Path bevel gear b. More torque
d. Herringbone gear c. More speed
d. None of these
9. The desired quality in gear is
a. Quietness 17. For equalizing the rotation of two gears, a
b. Durability gearbox employs
c. Strength a. Dog and clutch
d. All of these b. Crown gear
c. Star pinion
10. Straight and Zerol bevel gears should not be d. None of these
used when the pitch line velocity is greater
than 18. In a constant mesh gearbox, all the speed
a. 800 rpm gears remain
b. 850 rpm a. Separate
c. 875 rpm b. Joined to their couples
d. 900 rpm c. Of the same measurements
d. None of these
11. The spiral bevel gears are recommended
when the pitch line speed exceeds 19. If a big-gears is moved by a small gear then
a. 1000 fpm the big gear
b. 1100 fpm a. Will not rotate
c. 1500 fpm b. Will rotate in reverse direction
d. 2000 fpm c. Will rotate fastly
d. None of these
12. When the pitch line speed is above the 8000
fpm the teeth should be 20. _________ are bevel gears mounted on
a. Ground after hardening intersecting shafts at angle of other than 90
b. Should be cooled in air degrees.
c. Should be quenched after a. Right angle gears
d. None of these b. Half gears
c. Inclined gears
13. _____________ have curved teeth as in d. Angular gears
spiral bevels, but with zero spiral angle.
a. Spiral gears 21. The pitch angle is 90 degrees that is, the
b. Zerol bevel gears pitch cone has become a plane.
c. Zero bevel gears a. Atten gear
d. Straight bevel gears b. Crown gear
c. Cool gear
14. _______________ is a gear that has an d. Hiphap gear
advantage of smoother tooth engagement
quietness of operation greater strength and 22. ______________ is used to transmit power
higher permissible speeds. between non-intersecting shafts, nearly
a. Zerol bevel gear always at right angle to each other.
b. Straight Bevel gear a. Spur gear
c. Hypoid bevel gear b. Ordinary gear
d. Spiral bevel gear c. Bevel gear
d. Worm gear
15. When the pair of bevel gears of the same
size is on shafts intersecting at right angle,
23. What are the two types of construction for 31. Well proportion commercial gears with a
the worm? pitch line velocity of less than ___________
a. Shell and Cylindrical will normally not score of they have a
b. Shell and Zigzag reasonably good surface finish and are
c. Shell and Integral properly lubricated.
d. Tube and Integral a. 6000 fpm
b. 6500 fpm
24. The standard pressure angle for fine pitch c. 7000 fpm
gears is _____________ degrees and is d. 8000 fpm
recommended for most applications.
a. 14.5 degrees 32. Experimental data from actual gear unit
b. 16 degrees measurements are seldom repeatable within a
c. 20 degrees plus or minus __________ band.
d. 21 degrees a. 5%
b. 10%
25. The contact ratio of pair of mating spur c. 15%
gears must be well over___________ to d. 20%
insure a smooth transfer of load from one pair
of teeth to the next pair. 33. Pitting is a function of the Hertzian contact
a.1.0 stresses between two cylinders and is
b. 2.0 proportioned to the square root of the
c. 3.0 __________.
d. 4.0 a. Applied load
b. The contact stress
26. As general rule contact ratio should not be c. the stress
less than d. Impact
a. 1.1
b. 1.2 34. When an excitation frequency coincides with
c. 1.3 a natural frequency, this is known to be
d. 1.4 a. Unity
b. Resonance
27. Surface roughness on active profile surfaces c. Obliquity
on gear is about _______ pitch. d. Sinusoidal
a. 30
b. 32 35. The average tooth stiffness constant of face
c. 34 is usually
d. 36 a. 1.5 to 2psi
b. 3 to 6 psi
28. Tooth breakage on gear is usually c. 3 to 4 psi
a. A tensile fatigue d. 7.5 to 10 psi
b. A contact stress
c. A crack 36. When the number of teeth in a pair of
d. None of these meshing gears are such that they do not have
a common divisor _____________.
29. AGMA means a. Dummy
a. American German manufacturer Association b. LCD
b. Athletic Gear Main Association c. Add it
c. American Gear Metal Association d. Hunting
d. American Gear Manufacturers Association
37. For internal gears having a 20 degree
30. Which of the following does not belong to pressure angle and full depth teeth, the
the group?
difference between the number of teeth in a
a. Tooth scoring gear and pinion should nit be less than
b. Tooth breakage _________.
c. Pitting a. 10
d. Toughing b. 12
c. 14 45. The angle through which the gear turns from
d. 16 the time a particular pair of teeth come into in
contact until they are in contact at the pitch
38. Zerol bevel gears of 20 degree angle should point.
have a pinion either no less than a. Pressure angle
a. 15 teeth b. Angle of action
b. 16 teeth c. Angle of approach
c. 17 teeth d. Angle of recess
d. 18 teeth
46. Arc of the circle through which a tooth
39. ___________ are machine elements that travels from the point of contact with the
transmit motion by means of successively mating tooth to the pitch point is called;
engaging teeth.
a. Arc of contact
a. Sprockets b. Arc of approach
b. Gears c. Arc of recess
c. Tooth belt d. Arc of action
d. Annular
47. The ratio of the arc of approach to the arc of
40. Arc of the pitch circle through which a tooth action
travels from the first point of contact with the a. Approach ratio
mating tooth to the pitch point is called:
b. Action ratio
a. Arc of contact
c. Recess ratio
b. Arc of approach d. Contact ratio
c. Arc of recess
d. Arc of action 48. In a pair of gear, it is the plane that contains
the two aces in a simple gear, it may be any
41. Height of tooth above pitch or the distance lane containing the axes and the given point.
between the pitch circle and the top of the a. Axial plane
tooth is called:
b. Central plane
a. Dedendum c. Normal plane
b. Addendum d. Transverse plane
c. Working depth
d. Total depth 49. Arc of the pitch circle through which a tooth
travels from its contact with the mating tooth
42. The circle that bounds the outer ends of the at the pitch point where the contact ceases is
teeth. called:
a. Addendum circle a. Arc of contact
b. Dedendum circle b. Arc of approach
c. Pitch circle c. Arc of recess
d. Root circle d. Arc of action
43. The angle through which the gear turns from 50. The amount by which the width of the tooth
the time a given pair of teeth are in contact at space exceeds the thickness of the engaging
the pitch point until they pass out the mesh. tooth on the pitch circles.
a. Pressure angle a. Clearance
b. Angle of action b. Tolerance
c. Angle of approach c. Allowance
d. Angle of recess d. Backlash
44. The angle through which the gear turns from Gears D
the time a given pair of teeth are in contact at
the pitch point until they pass out the mesh. 1. The ___________ from which an involute
a. Pressure angle tooth is generated or developed
b. Angle of action a. Root circle
c. Angle of approach b. Base circle
d. Angle of recess c. Pitch circle
d. Dedendum circle
2. The angle at the base cylinder if an involute 9. The length of the arc of the pitch circle
gear, that the tooth makes with the gear axis. between the centers or other corresponding
a. Helix angle points of the adjacent teeth.
b. Pressure angle a. Circular pitch
c. Lead angle b. Diametral pitch
d. Base helix angle c. Base pitch
d. Normal pitch
3. In an involute gear, ______________ is the
pitch on the circle or along the line of action. 10. The smallest diameter on a gear tooth with
a. Base circle which the mating gear makes contact.
b. Normal base pitch a. Contact ratio
c. Base pitch b. Contact diameter
d. Pitch gear c. Contact stress
d. None of the above
4. The base pitches in the normal plane.
a. Normal pitch 11. The maximum compressive stresses within
b. Normal base pitch the contact area between mating gear tooth
c. Axial plane profiles called
d. Central plane a. Bearing stress
b. Contact stress
5. The base pitches in the axial plane.
c. Contact stress
a. Axial base pitch
d. None of the above
b. Axial pitch
c. Normal pitch 12. The curve formed by the path of a point on a
d. Base pitch circle as it rolls along a straight line.
a. Trochoid
6. In worm gear, ______________ is a plane b. Epicycloids
perpendicular to the gear axis and contains c. Hypocloid
the common perpendicular of the gear and
d. Cycloid
the worm axis.
a. Central plane 13. The circular pitch in the normal plane.
b. Normal plane a. Circular plane
c. Axial plane b. Normal circular pitch
d. Transverse plane c. Central plane
d. Circular base pitch
6. In worm gear, ______________ is a plane
perpendicular to the gear axis and contains 14. The strength of the arc between the tow
the common perpendicular of the gear and sides of a gear tooth on the pitch circles
the worm axis. unless otherwise specified.
a. Central plane a. Face of tooth
b. Normal plane b. Circular thickness
c. Axial plane c. Tooth profile
d. Transverse plane d. Face width
7. The length of the chord subtended by the 15. The amount by which the dedendum exceeds the
circular thickness arc is called addendum of
a. Backlash the mating tooth
b. Face width a. Tolerance
c. Chordal thickness b. Allowance
d. Curve thickness c. Clearance
d. Backlash
8. The height from the top of the tooth of the
chord subtending the circular thickness arc. 16. The smallest diameter on a gear tooth with which the
a. Curve thickness mating gear makes.
b. Chordal thickness a. Idler
c. Chordal addendum b. Pinion
d. Chordal dedendum
c. Gear c. Ratio factor
d. Central diameter d. Efficiency
17. The ratio of the arc of action to the circular pitch is 25. When it rolls along the outer side of another circle, it
known as is called
a. Contact ratio a. Cycloid
b. Action ratio b. Hypocycloid
c. Recess ratio c. Epicycloid
d. Approach ratio d. Trochoid
18. The curve that satisfy the law of gearing 26. A gear with teeth on the outer cylindrical surface
a. Tooth profile a. Annular gear
b. Stub curve b. external gear
c. Conjugate curve c. Idler
d. Involute curve d. Spur gear
19. The depth of the tooth space below the pitch circle or 27. That surface of the tooth, which is between the pitch
the radial dimension between the pitch circle and the circles to the top of the tooth, is known as _____.
bottom of the tooth space a. Face width
a. Addendum b. Tooth flank
b. Dedendum c. Face of tooth
c. Working depth d. Top land
d. Whole depth
28. The length of the teeth in axial plane
20. The circle that bounds the bottoms of the teeth. a. Face of tooth
a. Addendum circle b. Face width
b. Pitch circle c. Circular pitch
c. Base circle d. Chordal thickness
d. Dedendum circle
29. The surface of the tooth between the pitch cylinder
21. The ratio of the number of teeth to the number of and the addendum cylinder.
millimeters of pitch diameter. a. Face
a. Diametral pitch b. Flank
b. Module c. Top land
c. Circular pitch d. Bottom land
d. Base pitch
30. The concave portion of the tooth profile where it joins
22. The diametral pitch circulated in the normal plane and the bottom of the tooth space.
is equal to the pitch divided by the cosine of helix angle a. Tooth curve
a. Normal diametral plane b. Involute
b. Normal diametral pitch c. Fillet radius
c. Normal plane d. Fillet curve
d. Normal axial pitch
31. The maximum tensile stress in the gear tooth fillet
23. That portion of the face width that actually comes a. Gear stress
into contact with mating teeth, as occasionally one b. Contact stress
member of a pair of gears may have a greater face width c. Fillet stress
than the other is called d. Tooth stress
a. Effective face width
b. Effective tooth face 32. That surface which is between the pitch circle and the
c. Effective tooth thickness bottom land is called
d. Effective tooth flank a. Flank of tooth
b. Face of tooth
24. The actual torque ratio of a gear set divided by its c. Face width
gear ratio. d. Fillet of tooth
a. Coefficient of performance
b. Transmission ratio 33. The surface of the tooth between the pitch and root
cylinders.
a. Fillet c. Bottom land
b. Face d. Tooth space
c. Flank
d. Bottom land 42. The distance a helical gear or worm would thread
along its axis one revolution of it were free to move
34. The number of teeth in the gear divided by the axially.
number teeth in the pinion. a. Lead
a. Ratio factor b. Helix
b. Gear ratio c. Length of action
c. Transmission ratio d. Line of action
d. None of the above
43. The path of contact in involute gears. It is a straight
35. The angle that a helical gear tooth makes the gear line passing through the pitch point and the tangent to
axis. the base circles.
a. Helix angle a. Length of action
b. Lead angle b. Line of action
c. Pressure angle c. Line of contact
d. Tooth angle d. None of the above
36. When it rolls along the inner side of another circle 44. The distance on involute line of action through which
a. Cycloid the point of contact moves during the action of the tooth
b. Epicycloid profile
c. Hypocloid a. Length of action
d. Trochoid b. Line of action
c. Line of contact
37. The diameter of the circle coinciding with the tops of d. None of the above
the teeth on an internal gear.
a. Pitch diameter 45. The ratio of pitch diameter in millimeter to the
b. Internal diameter number of teeth.
c. Root diameter a. Dedendum
d. Dedendum diameter b. Addendum
c. Module
38. A gear with teeth on the inner cylindrical surface d. None of the above
a. Pitch gear
b. Internal gear 46. A plane normal to the tooth surfaces acts a point of
c. Idler contact and perpendicular to the pitch plane.
d. Spur gear a. Axial plane
b. Central plane
39. The curve formed by the path of a point on a straight c. Normal plane
line called their generatrix, as it rolls along a convex base d. Diametral
curve
a. Involute 47. The distance between similar equally spaced tooth
b. Cycloidal surfaces, in a given direction and along a given curve or
c. Cycloid line.
d. Trochoid a. Module
b. Pitch
40. The top surface of the tooth. c. Addendum
a. Tooth face d. Involute
b. Tooth surfaces
c. Top land 48. The angle subtended by the arc on the pitch circle
d. Tooth flank equal in the length to the circular pitch.
a. Pitch angle
41. The surface of the gear between the fillets of adjacent b. Pressure angle
teeth c. Helix angle
a. Space width d. Lead angle
b. Backlash
49. Of meshing gears, ______ is the point of tangency to also equal to working depth plus clearance.
the pitch circle. a. Full depth
a. Pitch point b. Working
b. Pitch of contact c. Whole depth
c. Pitch d. None of the above
d. Reference point
6. It is a condition in generated gear teeth when any part
50. In a pair of gears, it is the plane perpendicular to the of the fillet
axial plane and tangent to the axial plane and tangent to curve lies inside of a line drawn tangent to the working
the pitch surfaces. profile as its
a. Normal plane lowest point.
b. Central plane a. Medium cut
c. Pitch plane b. Under cut
d. Tangent plane c. Over cut
d. Hidden cut
GEARS E
7. The curve formed by the path of a point on the
1. One of the causes of spur gear tooth breakage is the extension of the radius
unbalanced load on one end of breakage is the of a circle as it rolls along the curve or line.
unbalanced load on one end of the tooth a. Cycloid
that results in higher stress than when the load is evenly
b. Epicycloids
distributed. To
c. Hypocycloid
minimize this problem, the face width “b” should not be d. Trochoid
greater than the
thickness of the tooth. In the absence of test values, the 8. A plane perpendicular to the axis plane and to the pitch
following can be a guide . plane.
a. 2.5 Pc < b < 4 Pc a. Normal plane
b. 2.0 Pd < b < 4 Pd b. Pitch plane
c. 2.5 Pd < b < 4 Pd c. Tangent plane
d. 2.0 Pc < b < 4 Pc d. Transverse plane
2. Any plane perpendicular to a gear axis is called 9. The octal width dimensions of a gear blank to the pitch
a. Plane of action plane.
b. Plane of rotation a. Total face width
c. Normal plane b. Effective face width
d. Transverse plane c. addendum
d. Transverse plane
3. The angle between the tooth profile and a radical line
at its pitch point. 10. The space between the teeth measured along the
Involute teeth the angle between the line of action and pitch circle.
line tangent to a. Tooth space
the pitch circle. b. Tooth thickness
a. Roll angle c. Backlash
b. Pitch angle d. Tooth face
c. Helix angle
d. Pressure angle 11. The width of tooth measured along the pitch circle.
a. Tooth space
4. The radial distance from the addendum circle to the b. Tooth thickness
working depth c. Backlash
circle. d. Tooth face
a. Total depth
12. An arbitrary modification of a tooth profile whereby a
b. Full depth
c. Whole depth small amount
d. Working depth of material is removed near the tip of the gear tooth.
a. Chamfer
5. The total depth of the tooth space equal to addendum b. Tip relief
plus dedendum
c. Under cut 20. For helical and herring bone gears, the speed ratio is
d. None of these limited to
a. 3:1
13. A plane tangent to the surfaces at a point or line of b. 5:1
contact. c. 6:1
a. Normal plane d. 10:1
b. Pitch plane
c. Tangent plane 21. They are cylindrical in form operate on parallel axes
d. Axial plane and have straight
teeth parallel to the axis.
14. A circle coinciding with or tangent to the bottoms of a. Helical gears
the tooth spaces. b. Bevel gears
a. Addendum circle
c. Spur gears
b. Pitch circle d. Worm gears
c. Base circle
d. Root circle 22. The design stress was based upon the ultimate
strength of the material with a factor of safety of about
15. The angle subtended at the center of the base circle ______.
from teeth origin a. 2
of an involute to the point of tangency of the generation b. 3
from any point
c. 4
on the same involute.
d. 5
a. Root angle
b. Roll angle 23. Safe working stresses for common gear materials
c. Pitch circle operating at very
d. Base circle low velocities are usually assumed to be ______ the
ultimate strenght.
16. ______ gear with teeth spaced along a straight line a. One-fourth
and suitable for
b. one-third
straight line motion. c. One-half
a. helical d. Two-third
b. bevel
c. rack 24. To avoid charring by the heat of friction, rawhide
d. worm gears should not be
operated of pitch line velocities greater than _____.
17. The pitch plane, axial plane and traverse plane, al a. 2500 fpm
intersect at a point b. 3000 fpm
and mutually perpendicular to the c. 3500 fpm
a. Principal reference plane d. 4000 fpm
b. Principal reference point
c. Principal reference axis 25. The outside diameter of the hub of the larger gears
d. Principal reference line should be _____
the bore for steel.
18. A device for engaging and disengaging gears. a. 1.5 times
a. Gear shift b. 1.6 times
b. Gear train c. 1.7 times
c. Gear wheel d. 1.8 times
d. Gear motor
26. The outside diameter of the hubs of larger gears
19. For spur gear, the speed ratio is customary to limit the should be ______
reduction of the bore for cast iron.
a. 3:1
a. 1.5 times
b. 4:1 b. 1.8 times
c. 5:1 c. 2.0 times
d. 6:1 d. 2.5 times
27. Helix angles of _____ degrees are preferred for single c. 22.5 degrees
helical gears. d. 25 degrees
a. 10 and 18
b. 12 and 20 35. The axes intersect, and the teeth are curved and
c. 15 and 23 oblique is called
d. 18 and 28 a. Skew bevel gears
b. Straight bevel gears
28. Helix angles of _____ degrees are preferred for c. Spiral bevel gears
double helical gears. d. Zerol bevel gears
a. 15 and 25
b. 20 and 30 36. A type of gear axes of non-parallel and non-
c. 25 and 40 intersecting and the teeth
are straight.
d. 30 and 45
a. Hypoid gears
29. A ______ is a spur gear of infinite diameter. b. Skew bevel gears
a. hypoid c. Straight bevel gears
b. Herring bone d. Zerol bevel gears
c. annular
d. rack 37. For worm gears, Buckingham recommends face width
a. 0.2 Dwo
30. It is standard practice to assume that the thickness of b. 0.3 Dwo
the tooth measured around the pith circle is exactly ____ c. 0.4 Dwo
of the circular pitch. d. 0.5 Dwo
a. one-fourth
b. one-half 38. For worm gears, circular pitch is equal to
c. one-third a. Axial pitch
d. two-third b. Diametral pitch
c. Normal pitch
31. It occurs under heavy loads and in adequate d. Traverse pitch
lubrication.
a. Pitting 39. The service factor of heavy shock, rolling mill, and
b. Honing rock
c. Scoring crushes.
d. Tooth breakage a. 1.25 – 1.35
b. 1.35 – 1.50
32. In order to get the benefit of helical-gear action the c. 1.50 – 1.80
face width should d. 1.75 – 2.00
be at least _____ the axial pitch.
a. once 40. Any plane perpendicular to a gear axis is called
b. twice a. Transverse axis
c. thrice b. Conjugate axis
d. minimum c. Plane rotation
d. Axis of rotation
33. The outside diameter of the worm gear measured on
the central 41. The circle containing the bottoms of the tooth spaces
plane. is called
a. Addendum diameter a. Addendum circle
b. Throat diameter b. Base circle
c. Pitch diameter c. Pitch circle
d. Root diameter d. Root circle

34. For worms mating with gears having 24 teeth or more 42. The surface between the flanks of adjacent teeth.
the ______ a. Bottom land
pressure angle is recommended. b. Top land
a. 14.5 degrees c. Pitch surface
b. 20 degrees d. Space width
43. The usual ratio of miter gear is GEARS F
a. 1:1
b. 1:2 1. Which type of gear is a cylinder, wheel or disk on the
c. 1:3 surface of
d. 1:4 which is cut parallel teeth?
a. Bevel gear
44. The angle between an element of the face cone and b. Helical gear
its axis c. Spur gear
equals pitch angle plus addendum angle. d. Worm gear
a. Cutting angle
b. Face angle 2. Which type of gear has a ratio of 1:1?
c. Pitch angle a. Herringbone gears
d. Front angle b. Miter gear
c. Internal gear
45. The apex of the pitch cone. d. Spur gear
a. Cone center
b. Vertex 3. The distance between similar sides of adjacent teeth
c. Pitch point measured
d. Apothem on the pitch line is called
a. Diametral pitch
46. The portion of the tooth surface adjacent to the b. Linear pitch
involute lying c. Circular pitch
inside a radial line passing through an imaginary d. Axial pitch
intersection of the
involute and the base circle. 4. The rack gear, circular pitch is called
a. Excessive cut a. Linear pitch
b. Over cut b. Base pitch
c. Under cut c. Diametral pitch
d. None of the above d. Axial pitch

47. In spur gearing system, the preferred pressure angle is 5. _________ is equal to twice the addendum.
a. 14-1/2 deg a. Tooth flank
b. 20 deg b. Tooth thickness
c. 22-1/2 deg c. Whole depth
d. 25 deg d. Working depth

48. Hub length usually vary from 6. The meaning of module in a gearing system is
a. 1.05 Ds to 1.l7 Ds a. Distance
b. 1.25 Ds to 2 Ds b. Addendum
c. 1.35 Ds to 2.5 Ds c. Measure
d. 1.35 Ds to 3.0 Ds d. Surface

49. The service factor for heavy shock is 7. Refers to the portion of the tooth surface adjacent to
a. 1 to 1.25 the involute
b. 1.25 to 1.50 lying inside a radial line passing through an imaginary
c. 1.50 to 1.75 intersection
d. 1.75 to 2.0 of the involute and the base circle.
a. Over cut
50. A gear wheel with curved teeth that mesh with a b. Under cut
worm. c. Tip relief
a. Worm wheel d. None of the above
b. Rack gear
c. Spiral gear 8. In a pair of gears, spur or bevel, the smaller is often
d. Herring bone gear called
a. Rack
b. Pinion
c. Worm c. Sole
d. Idler d. Corner
9. Which of the following gears that are of the same size 17. The apex of the pitch cone.
and a. Cone vertex
transmit motion at right angles? b. Cone distance
a. Herringbone gears c. Cone radius
b. Spur gears d. Cone center
c. Miter gears
d. Rack gears 18. Gear pump used in hydraulic system are used for
a. Low and medium pressure
10. The cones, which represents in bevel gears the b. Medium and high pressure
original friction c. Low and high pressure
surfaces, are called d. Medium and not high pressure
a. Back cone
b. Length of cone 19. In machine tool drive the modulus for gears are
c. Pitch cones usually
d. Cone distance selected between
a. 10 ≥ μ ≥ 1
11. Which of the following angles equals the pitch angle? b. 2 ≥ μ ≥ 1
a. Back angle c. 20 ≥ μ ≥ 1
b. Front angle d. 5 ≥ μ ≥ 1
c. Face angle
d. Root angle 20. The shape of the curve on the sides of gear tooth is
termed as
12. The surface between the flanks of adjacent teeth. a. Stub
a. Top land b. Involute
b. Tooth flank c. Trochoid
c. Tooth face d. Cycloid
d. Bottom land
21. The distance in a straight line from one side of a tooth
13. The portion of the common tangent to the base to the
circles along side at points where the pitch circle passes through the
which contact between malting involutes occurs. tooth.
a. Line of action a. Circular pitch
b. Pitch line b. Pitch
c. Arc of action c. Chordal thickness
d. Angle of action d. Tooth length
14. The intersection between the axes of the line of 22. The ________ of a bevel gear is equal to the altitude
centers and the of the
common tangent to the base circles. pitch cone.
a. Pitch line a. Length of cone
b. Pitch circle b. Vertex distance
c. Pitch point c. Length of hub
d. Pitch surface d. Thickness
15. The angle between the element of the face cone and 23. The _______ of a worm is the distance between the
its axis. center of
a. Face angle one tooth and the center of an adjacent tooth, measured
b. Back angle perpendicular to the teeth.
c. Front angle a. Diametral pitch
d. Increment angle b. Circular pitch
c. Axial pitch
16. Refers to a portion of the small end of the tooth. d. Normal pitch
a. Heel
b. Toe
24. The _________ of a worm gear is the concave surface c. 3 π
of the d. 4 π
gear tooth.
a. Radius 32. A line drawn through all the points at which the teeth
b. Throat touch
c. Pitch each other.
d. Addendum a. Angle of contact
b. Arc of contact
25. A type of gear, which is used for heavy duty work c. Path of contact
where a large d. Arch of approach
ratio of speed is required.
a. Worm gear 33. The length of the gear tooth measured along an
element of the
b. Bevel gear
c. Spur gear pitch surface is called
d. Miter gear a. Acting flank
b. Face width
26. A ________ is a cylinder with teeth resembling those c. Flank of the tooth
of an d. Tooth face
acme thread.
a. Pinion 34. The _______ is equal to the tooth thickness plus the
space width.
b. Spur
a. Normal pitch
c. Worm
d. Bolt b. Axial pitch
c. Diametral pitch
27. The ________ is the angle at which the teeth of a d. Circular pitch
helical gear
are slanted across the face of the gear. 35. The _______ is the arc of the pitch circle where the
a. Lead angle tooth profile cuts the pitch circle when a pair of teeth first
comes in contact until they are in contact at the pitch
b. Helix angle
c. Pressure angle point.
d. Pitch angle a. Arc of recess
b. Arc of approach
28. A ___________ is one that is thicker in proportion to c. Arc of contact
its length than the involute tooth. d. Arc of action
a. Hypoid
b. Cycloidal tooth 36. The ______ traced by the outermost corner of one
c. Stub tooth tooth on the plane of the other gear.
d. Spiral a. Cycloid
b. Hypocycloid
29. Which gears are used to connect parallel shafts lying c. Epitrochoid
in the same plane? d. Trochoid
a. Worm gears
b. Bevel gears 37. An imaginary circle passing through the points at
c. Herringbone gears which the tooth of the meshing gears contact each other.
d. Spiral gears a. Pitch circle
b. Base circle
30. Which gears are used to connect the shafts at an c. Addendum circle
angle but d. Dedendum circle
lying in same plane?
a. Helical gears 38. A gear with teeth on the outer cylindrical surface.
b. Worm and worm wheel a. Rack gear
b. Zerol gear
c. Spur gears
d. Herringbone gears c. Miter gear
d. External gear
31. The product of circular pitch and diametral pitch is
a. 2 π 39. The diameter of a circle coinciding with the top of the
b. π teeth of an internal gear.
a. Dedendum diameter c. Total depth
b. Pitch diameter d. Whole depth
c. Base diameter
d. Internal diameter 48. The amount by which the dedendum in a given gear
exceeds the addendum of its mating gear.
40. It is standard practice to assume that the thickness of a. Whole depth
the tooth measured around the pitch circle is exactly b. Clearance
_____ the circle pitch. c. Blacklash
a. One half d. Working depth
b. One third
c. One fourth 49. The outside diameter of the worm gear measured on
d. One fifth the central plane.
a. Dedendum diameter
41. The helix angles for herringbone gears are used from b. Addendum diameter
______ for industrial gears. c. Throat diameter
a. 10 to 15 d. Pitch diameter
b. 15 to 20
c. 20 to 30 50. The circle from which the involute is generated.
d. 25 to 45 a. Base circle
b. Pitch circle
42. The distance parallel to the axis from the pitch circle c. Working depth circle
to the face of the shoulder or hub. d. Addendum circle
a. Back cone
b. Backing KEYS, SPLINES, COUPLINGS
c. Crown height 1. A type of coupling that allows slight amount
d. Apex distance of torsional angular flexibility due to introduction with
43. A machine that makes gear teeth by means of a some elastic material cylindrically wrapped around the
reciprocating cutter that rotates slowly with the work. bolts in the flange.
a. Gear forming A. Simple elastic bonded coupling
b. Gear hobber B. Elastic material bushed coupling
c. Gear shaper C. Elastic materials bonded coupling
d. Gear cutter D. All of these

44. A type of gear wheels connecting non parallel, non 2. Which of the following keys that is square or flat and
intersecting shafts usually at right angles. tapered with head?
a. Helical gear A. Pin key
b. Herringbone gear B. Saddle key
c. Hypoid gear C. Gib-head keys
d. Bevel gear D. None of the above

45. The angle between the plane of the pitch circle and a 3. What are considered as the most common keys?
plane tangent to the large end of the tooth. A. Flat keys
a. Front angle B. Square keys
b. Back angle C. Saddle keys
c. Dedendum angle D. A & B above
d. Face angle 4. A key may either be straight or tapered. It is usually a
46. The circle containing the bottoms of the tooth spaces. drive fit.
a. Root circle A. Pin key
b. Working depth circle B. Saddle key
c. Base circle C. Gib - head key
d. Pitch circle D. None of these

47. The depth of the tooth inside of the pitch line is called 5. A key with one of several patented methods of keying
a. Working depth is driven or pressed into a hole that is small enough to
b. Dedendum close the slit, assembled in radial direction.
A. Fit key
B. Saddle key 14. Which key is normally used in wrist
C. Roll pin watches?
D. Pin key A. Kennedy keys
B. Sunk key
6. Kennedy keys are also known as C. Tangent keys
A. Tangential keys D. None of the above
B. Normal keys
C. Saddle keys 15. If a square key and shaft are to be of the
D. Roll pin same material and of equal strength the length
of key would be equal to
7. A key that allows the hub to move along the A. D
shaft but prevents the rotation of the shaft. B. 0.75D
A. Woodruff keys
C. 1.2D
B. Feather keys D. 1.5D
C. Gibbs keys
D. Square key 16. A type of key that is used in self- aligning
machine key made by a side milling cutter in the
8. Which of the following type of fits used for form of a segment of a disk.
involute spline? A. Kennedy key
A. Close fit B. Saddle key
B. Press fit
C. Tangent key
C. Sliding fit
D. Woodruff key
D. All of these
17. A female mating member that forms a
9. Used for permanents fits and are similar to groove in the shaft to which the key fits.
involute splines except that the pressure angle is A. Key path
14.5 degrees. B. Key way
A. Separation load C. Key holder
B. Stub serrations
D. Key hole
C. Spline Shaft
D. Involute Serrations 18. A square taper key fitted into a keyway of
square section and driven from opposite ends of
10. In the case of a knuckle joint, the pin is the hub is known as
most likely to fail in. A. Barth key
A. Compression B. Feather key
B. Shear C. Kennedy key
C. Tension D. Saddle key
D. Double shear
19. A machine member employed at the
11. In case of sunk key, interface of a pair of mating male and female
A. The key is cut in both shaft and hub circular cross – sectioned members to prevent
B. The key way is cut in hub only relative angular motion between these mating.
C. The key way is cut in shaft only A. Keyway
D. The key way is helical along the shaft B. Key
12. Splined shafts are generally for. C. Constant key
A. Aircraft D. Variable key
B. Automobiles 20. A leather key is one of the following types of
C. Bicycles A. Sunk
D. Machine tools B. Tapered
13. Splines are used when C. Parallel
A. The power to be transmitted is low D. Tangent
B. The power to be transmitted is high 21. Permanent keys made integral with the shaft and
C. The torque is high fitting into key ways broached into the mating hub.
D. Axial relative motion between shaft and hub A. Square keys
is necessary B. Splines
C. Woodruff keys A. Clevis pins
D. Kennedy keys B. Cotter pins
C. Dowel pins
22. A type of square key with bottom two corners D. Taper pins
beveled is called
A. Flat key 31. The key fits mating grooves in the shaft and
B. Feather key mating member is called
C. Barth key A. Key way
D. Woodruff key B. Key path
C. Key hole
23. The bearing load on feather keys should not exceed D. None of these
A. 600psi
B. 800psi 32. Used as couplings, or in addition to overload, where
C. 1000psi there is danger of injury to machines or to material in
D. 1200psi process.
A. Flange couplings
24. The two keys are angularly spaced B. Involute serrations
A. 45° C. King pins
B. 60° D. Shear pins
C. 75°
D. 90° 33. A coupling that transmits power via the frictional
forces induced by pulling the flanges toward each other
25. The three keys are angularly spaced over slotted tapered sleeves is known as
A. 60° A. Flange coupling
B. 90° B. Flange compression coupling
C. 120° C. Ribbed compression coupling
D. 180° D. Rigid coupling
26. The permissible crushing stress is about ________ 34. What is used for absorbing some shock and vibration
times the permissible shear stress that may appear on one shaft and of preventing the
A. 1.5 occurrence of reversed stresses caused by the shaft
B. 1.7 deflecting at the coupling.
C. 1.9 A. Flange coupling
D. 1.10 B. Flexible coupling
27. Practical considerations required that the hub length C. Rigid coupling
should be at least _______ to obtain a good grip. D. None of these
A. 1.2D 35. For a single Hooke’s coupling the shaft angle should
B. 1.5D not be greater than
C. 1.7D A. 10°
D. 1.9D B. 12°
28. For three keys, a ________ percent overload often is C. 15°
used. D. 30°
A. 10 36. A universal coupling is
B. 15 A. A rigid coupling
C. 20 B. A type of flange coupling
D. 25 C. Used for collinear shafts
29. A pin that is cylindrical in shape with a head on one D. Used for non – collinear shafts
end and a radial through hole in the other end. 37. A flange coupling is
A. Clevis pins A. Flexible
B. Taper pins B. Used for collinear shafts
C. Dowel pins C. Used for non collinear shafts
D. Taper pins D. Used only on small shafts rotating at low
30. Used for the attachment of levers, wheels and speed
similar devices onto shafts for light duty service.
 38. In flange coupling the weakest element C. To reduce the transmission of shock loads from
should be the one shaft to another
A. Bolts D. All of the above
B. Flange
C. Key 46. Typical hub length falls between _________ where D
D. Shaft is the shaft diameter
A. 1.2D and 1.8D
39. In flange coupling the flange bolts are designed B. 1.25D and 2.4D
for C. 1.30D and 2.5D
A. Fatigue D. 1.35D and 3.0D
B. Shear forces
C. Compression 47. The diameter of the large end of the pin should be
_______the shaft diameter
D. Tensile forces
A. 1/4
40. Which of the following mechanical devices is B. 1/3
used for uniting or connecting parts of a mechanical C. 1/2
system? D. 3/2
A. Coupling
B. Keys 48. The most common type of sliding action fastener and
C. Splines is widely used on doors is the
A. Pawl fastener
D. Flexible couplings
B. Magnetic fastener
41. A coupling that employs a fluid to provide C. Sliding latch
angular flexibility between the input and output D. Screw fastener
shafts
A. Rigid coupling 49. When the key is not fitted on all four sides experience
B. Flexible coupling has shown that, the permissible crushing stress is about
C. Hydraulic coupling __________ times the permissible shear stress
A. 1.3
D. Oldham coupling
B. 1.5
42. Which of the following type of coupling is used C. 1.7
with collinear shafts D. 1.9
A. Collar coupling
B. Rigid coupling 50. The mechanical fastening that connects shafts
C. Flexible coupling together for power transmission
D. Hydraulic coupling A. Coupling
B. Key
43. A type of coupling used to connect shafts that C. Splines
have lateral misalignment D. None of the above
A. Compression coupling
B. Collar coupling SHAFTS
C. Chain coupling 1. Torsional deflection is a significant consideration in the
D. Oldham coupling design of shaft and the limit should be in the range of
44. A coupling that is composed of two slotted ________ degrees/ foot of length.
members, which are connected by a continuous a. 0.004 to 0.006
steel spring, and lies in the slots b. 0.08 to 1
A. Ajax coupling c. 0.006 to 0.008
B. Falk coupling d. 0.008 to 1
C. Lord coupling
D. Slip coupling 2. For a universal joint shaft angle should he
_______degrees maximum and much less if in high
45. Shaft couplings are used in machinery for several rotational speed.
purposes. The most common purpose of shaft coupling is a. 12
A. To provide for the connection of shafts of units b. 16
that are manufactured separately c. 15
B. To provide for misalignment of the shafts d. 14
3. It is good design practice for steel line shafting to 11. For transmission shafts the allowable deflection is one
consider a limit to the liner a deflection of degree in a length of _______ diameters.
_______inch/foot length maximum. a. 10
a. 0.050 b. 15
b. 0.010 c. 20
c. 0.020 d. 25
d. 0.060
12. An old rule of thumb for transmission shafting is that
4. It is a rotating machine member that transmits power. the deflection should not exceed ________ of length
a. Cam between supports.
b. Plate
c. Shaft a. 0.01 in. per foot
d. Flywheel b. 0.02 in. per foot
c. 0.03 in. per foot
5. A stationary member carrying pulleys, wheels and etc. d. 0.04 in. per foot
that transmit power is called:
a. Axle 13. In general for machinery shafts, the permissible
b. Propeller shaft deflection may be closer to
c. Turbine shaft a. 0.02 in/ft
d. Machine shaft b. 0.01 in/ft
c. 0.002 in/ft
6. A line shaft is also known as
d. 0.030 in/ft
a. Counter shaft
b. Jack shaft 14. The speed at which the center of mass will equal the
c. Main shaft deflecting forces on the shafts with its attached bodies
d. Head shaft will then vibrate violently, since the centrifugal forces
changes its direction as the shafts turns.
7. Which of the following shaft intermediate between a
line shaft and a driven shaft?
a. Critical speed
a. Counter shaft b. Geometrical speed
b. Jack shaft c. Mean speed
c. Head shaft d. Unit speed
d. All of the above
15. For shaft, the minimum value of numerical combined
8. Short shafts on machines are called shock and fatigue factor to be applied in every case to the
a. Core shafts computed bending moment is
b. Head shafts
c. Medium shafts a. 1.0
d. Spindles b. 1.3
9. For shafts, the shear due to bending is a maximum at c. 1.5
the neutral plane where the normal stress is d. 1.8
a. constant 16. It is suggested that the design factor on the yield
b. Maximum strength be about 1.5 for the smooth load, about 2 to
c. Minimum 2.25 for minor shock loads, and ________ when the
d. Zero loading reverses during operation.
10. Criteria for the limiting torsional deflection vary from a. 3.0
0.08 per foot of length for machinery shafts to ______ per b. 4.0
foot. c. 3.5
a. 1° d. 4.5
b. 2°
17. A column is called sort column when.
c. 3° A. The length is more than 30 times the
d. 4° diameter
B. Slenderness is more than 120
C. The length is less than 8 times the diameter
D. Slenderness is more than 32
18. For a circular shaft subjected to torque the A. 282 kg/cm^2
value f shear stress. B. 423 kg/cm^2
A. Uniform throughout C. 599 kg/cm^2
B. Has maximum value at the axis D. 620 kg/cm^2
C. Has maximum value at the surface
D. Is zero at the axis and linearly increases to a 27. The value of allowable stresses which are generally
maximum value at the surface of the shaft used in practice for line shafts carrying pulleys is
A. 150 kg/cm^2
19. The compression members tend to buckle in B. 282 kg/cm^2
the direction of C. 423 kg/cm^2
A. Axis of load D. 550 kg/cm^2
B. Perpendicular to the axis of load
28. The value of allowable stresses which are generally
C. Minimum cross-section
D. Least radius of gyration used in practice for small, short shafts, countershafts is.
A. 282 kg/cm^2
20. A reinforcement concrete beam is B. 599 kg/cm^2
considered to be made of. C. 650 kg/cm^2
A. Clad material D. 750 kg/cm^2
B. Composite material
C. Homogeneous material 29. Torsional deformation in transmission shafts should
be limited to _____ in 20 diameters.
D. Heterogeneous material
A. 1°
21. The column splice is used for increasing B. 2°
A. Strength of the column C. 3°
B. Cross-sectional area of the column D. 4°
C. Length of the column
D. All of the above 30. Lateral deflection caused by bending should not
exceed
22. A simply supported beam has a uniformly A. 0.001 in. per foot of length
distributed load on it, the bending moment is. B. 0.005 in. per foot of length
A. Triangle C. 0.01 in. per foot of length
B. Parabola D. 0.05 in. per foot of length
C. Semi-circle
D. Rectangle 31. Front axle should be live and
A. weak
23. The power obtained by the piston reaches B. Dead
flywheel through the. C. strong
A. countershaft D. None of these
B. crankshaft
C. Transmission shaft 32. The steering is coupled to the two front wheels by
D. Line shaft means of a
A. Connecting rod
24. There two types of crankshaft. B. Tie rod
A. Single piece and build up C. Push rod
B. Forged and turned D. Spindle
C. Rotary and stationary
D. None of these 33. In the overdrive transmission system the rotation
speed of _____ rest higher than that of the engine’s
25. Engine valves get open by means of. speed
A. Cam shaft A. Main shaft
B. Rocker shaft B. Crank shaft
C. Crank shaft C. Propeller shaft
D. Valve guard D. Machine shaft
26. The value of allowable stresses which are 34. A slip joint _____ the length of the propeller shaft.
generally used in practice for main transmitting A. increases
shaft is B. decreases
C. Keeps appropriate C. 15000 to 30000 rpm
D. None of the above D. 20000 to 50000 rpm
35. The transmission system incorporates clutch, gear 44. Which of the following materials is used for shafting?.
box, and propeller shaft and. A. AISI 3240
A. brake B. AISI 3150
B. differential C. AISI 4063
C. Steering D. AISI 33000
D. Main shafting
45. The process of redistributing the mass attached to
36. The lay shaft moves _____ the primary shaft. rotating body in order to reduce the vibrations arising
A. Equal to from a centrifugal force.
B. More than A. Shaft coupling
C. Less than B. Shaft balancing
D. In the gear ratio C. shaft hooper
D. Stator balancing
37. The main shaft is lifted _____ the lay shaft.
A. before 46. In many cases the _____ of the shaft is important
B. After design fracture.
C. Parallel to A. deflection
D. Adjacent to B. rigidity
C. size
38. In the top gear, the rotational speeds of _____ remain D. strength
the same.
A. Primary and lay shafts 47. Commercial shafting is made of.
B. Main and lay shafts A. Low carbon steel
C. Primary and main shafts B. Cats iron
D. Secondary and main shafts C. brass
D. bronze
39. The primary and lay shafts rotate in ____ direction.
A. In the same 48. What is the most common material for shafting?
B. different A. Wrought iron
C. reverse B. Cast iron
D. None of the above C. Mild steel
D. aluminum
40. It is an integral part of a machine
A. Spindle 49. Cold drawing produces a _____ shaft that hot rolling,
B. Axle but with higher residual stresses.
C. Countershaft A. weaker
D. Machine shaft B. stronger
C. harder
41. Stresses in shaft are analyzed through. D. None of the above
A. torsional
B. bending 50. Allowable stresses in shear equal to _______ are
C. axial common design of a shaft.
D. All of these A. 3000 to 5000 psi
B. 4000 to 6000 psi
42. What is the standard stock length? C. 5000 to 8000 psi
A. 16 ft D. 6000 to 10000 psi
B. 20 ft
C. 24 ft
D. All of the above
43. Centrifugal separators that operate a speeds _____
also employ these flexible shafts.
A. 1000 to 3000 rpm
B. 5000 to 10000 rpm