1.

Determine the mass moment of inertia in (kg-m-s^2) with respect to the axis of rotation, the
flywheel effect, and the radius of gyration of cast iron flywheel having the following
specification: Rim: OD = 1350 mm ; ID = 1050 mm, Face width = 325 mm, Hub: OD =
230 mm: ID = 105 mm, Length = 270 mm, Arms: 6 with 60 x 85 mm in cross-section and
considered as slender rods, L = 500mm. Material: Cast iron.
A. 492
B. 598
C. 669
D. 379

ANSWER: A

2. Determine the total mass of the flywheel in kg with respect to the axis of rotation, the flywheel
effect, and the radius of gyration of cast iron flywheel having the following specification: Rim:
OD = 1350 mm ; ID = 1050 mm, Face width = 325 mm, Hub: OD = 230 mm: ID = 105
mm, Length = 270 mm, Arms: 6 with 60 x 85 mm in cross-section and considered as slender
rods, L = 500mm. Material: Cast iron.
A. 1674
B. 1474
C. 1895
D. 1307

ANSWER: B

3. A rectangular key was used in a pulley connected to a line shaft with a power of 130 kW at a
speed of 1100 rpm. If the shearing stress of the shaft is 45 N/mm^2 and the key to be 25 hat of
the shaft diameter.
A. 158 mm
B. 168 mm
C. 178 mm
D. 188 mm

ANSWER: C
4. A flange coupling with bolt circle diameter of 300 mm uses 10 bolts, 25 mm diameter. The torque
transmitted is 20 KN.m and compressive stress of bolts is 15 MPa. Determine the required flange thickness.
A. 32 mm
B. 36 mm
C. 34 mm
D. 38 mm

ANSWER: B

5. A coupling that allows axial flexibility/movement in the operation. Made of alternate bolting of steel,
leather, fabric and/or plastic material into the two flanges
A. Flexible disc coupling
B. Flexing Oldham coupling
C. Flexible toroidal spring coupling
 D. Elastic-material bonded coupling

ANSWER: A
6. A 76.2 mm diameter shafting of SAE 1040 grade cold rolled, having a yield point of 50 ksi and with a ¾ x
¾ x 5 inches key. Compute the minimum yield point in the key in order to transmit the torque of the shaft.
The factor of safety to used is 2 and Sys=0.5Sy.
A. 39.20 ksi
B. 279.20 ksi
C. 42.130 ksi
D. 47.120 ksi
ANSWER: D
7. A flywheel weighing 6 kN has a mean diameter of 90 cm. The maximum speed of the flywheel is 7 rev/sec
slowed down to 4 rev/sec during the shearing process. Determine the energy released by the flywheel.
A. 7856 kg-m
B. 9872 kg-m
C. 8145 kg-m
D. 8241 kg-m
ANSWER: D

8. A flywheel rotates at a 220 rpm slowed down to 65% of its revolution during the three – fourth second
punching portion of the cycle. Compute the angular acceleration of the flywheel in radian per second
squared.
A. 10.7
B. -10.7
C. 7.10
D. -7.10
ANSWER: B
9. A punch and die set to punch a ¾ in. hole in a 3/8 in. thick plate. If the ultimate shearing stress or strength
of the plate is 50,000 psi, what force will be required?
A. 4000 lb
B. 42,000 lb
C. 9000 lb
D. 44,200 lb
ANSWER: D

10. A punch punches a 1-in diameter hole in a steel plate ¾ inch thick every 10 sec. The actual punching takes
1 sec. The ultimate shear strength of the plate is 60,000 psi. The flywheel of the punch press has a mass
moment of inertia of 500 in-lb-sec2 and rotates at a mean speed of 150 rpm. What is the horsepower
required for the punch operation?
A. 7.04 hp
B. 9.04 hp
C. 8.04 hp
D. 10.04 hp
ANSWER: C

11. What pressure is required for punching a 1-inch square hole in a ¼ inch thick plate steel?
A. 15 tons
B. 32 ½ tons
C. 20 tons
D. 26 2/3 tons
ANSWER: D
12. Before installing a new flange gasket be sure that the:
A. flange faces are painted
B. flange faces are absolutely clean
 C. isolating valves are open
D. old gasket is in place
ANSWER: B
13. The cast iron flywheels are commonly designed with a factor
of safety of______
A. 14 to 15
B. 8 to 9
C. 10 to 13
D. 6 to 12
ANSWER: C

14. A flywheel rotates at 120 rpm or 12.57 rad/sec slowed down to 102 rpm or 10.68 rad/sec during
the punching operation that requires ¾ second of the punching portion of the cycle. Compute
the angular acceleration of the flywheel in rad/sec 2.
A. -2.52 rad/sec2

B. -2.75 rad/sec2

C. 3.15 rad/sec2

D. 2.22 rad/sec2

ANSWER: A

15. A flywheel for a punching press must be capable of furnishing 3400 N-m of energy during the
25% revolution while the hole is being punched. The flywheel maximum speed is 200 rpm and
the speed. The mean radius of the rim is 1016 mm and contributes 90% of the energy
requirements. Approximate total weight of the flywheel to be 1.20 times that of the rim.
Compute for the coefficient of fluctuation.
A. 0.0139
B. 0.159
C. 0.002
D. None of the Above
ANSWER: A
16. Tapered square keys with the diagonal dimension in a circumferential direction
A) Square key         
B) woodruff key
C) saddle keys
D) kennedy key
ANSWER: D
17. Is a square key with bottom two corners bevelled.
A) Square key
B) saddle key
C) barth key
D) woodruff key
18. ANSWER: C
 It is a rectangular sunk key with a head at one end known as gib head. It is usually provided to
facilitate the removal of key
A) Gib-head key
B) parallel sunk key
C) rectangular sunk key
D) feather key
ANSWER: A
19. Rectangular or square section uniform in width and thickness throughout.
A) gib-head key
B) parallel sunk key
C) rectagular sunk key
D) feather key
ANSWER: B
20. A key attached to one member of a pair and which permits relative axial movement.
A) Gib-head key
B) parallel sunk key
C) rectangular sunk key
D) feather key
ANSWER: D
21. The depth of the keyway in each of the shafts to be connected should be________ and the
diameters should also be same
A) greater than
B) less than
C) the same
D) haft
ANSWER: C
22. The depth of the keyway in each of the shafts to be connected should be________ and the
diameters should also be same
A) greater than
B) less than
C) the same
D) haft
ANSWER: C
23. Is a flat key that is easy to facilitate easy driving and removal of the key
A) Square key
B) woodruff key
C) gib-head taper key
D) kennedy key
ANSWER: C
24. A sheet metal working company purchase a shearing machine from a surplus dealer without a
flywheel. It is calculated that the machine will use 2380 joules of energy to shear a 1.2 mm thick
sheet metal. The flywheel to be used will have a mean diameter of 91.44 cm with a width of
25.4 cm. The normal operating speed is 180 rpm and slows down to 160 rpm during the shearing
process. Assuming that the arms and the hub will account for 12% of the rim weight
 concentrated at the mean diameter and that the material density is 0.26 lb/cu. In. Compute for
the weight of the flywheel.
A. 296 kg
B. 306 kg
C. 347 kg
D. 385 kg
ANSWER: B
25. A 48 in diameter spoked steel flywheel having a 12 in wide x 10 in deep rim rotates at 200 rpm.
How long a cut (in inches) can be stamped in one inch thick aluminum plate if utimate shearing
strength of the aluminum is 40,000 lb/in^2. During stamping, the force exerted by the stamp
varies from a maximum F lb at the point of contact to zero lb when the stamp emerges from the
metal. Neglect the weight of the flywheel and spokes and use 0.28 lb/in^3 density for flywheel
material.
A. 43.2 in
B. 41.1 in
C. 44.5 in
D. 35.9 in
ANSWER: B
26. An engine is designed to develop 10kW of power at a mean speed of 1000 rev/min. Find the
moment of inertia, in kg-m2, of a suitable flywheel, assuming a speed variation of ± 1.5% of the
mean speed and an energy fluctuation equal to 0.9 of the work done per revolution.
A. 1.612 kg-m2
B. 1.566 kg-m2
C. 2.014 kg-m2
D. 2.333 kg-m2
ANSWER: A
27. A shearing machine requires 150 kg m of energy to shear a steel sheet, and has a normal speed
of 3.0 rps, slowing down to 2.8 rps during the shearing process. The flywheel of the machine has
a mean diameter of 75 cm and weighs 15.5 kg/cm^3. The width of the rim is 30 cm. If the hub
and arms of the flywheel account for 15% of its total weight, find the thickness of the rim in cm.
A. 0.00487 cm
B. 0.00432 cm
C. 0.00363 cm
D. 0.00482 cm
ANSWER: C
28. What would be the weight of a flywheel in kg if the weight of the rim is 3 times the sum of the
weight of the hub and arms. Given the outside diameter and inside diameter to be 24 in and 18
in respectively and the rim width is 4.5 in. (assume steel flywheel)
A. 140.95 kg
B. 160.95 kg
C. 200.95 kg
D. 152.95 kg
ANSWER: D
29. A cast iron flywheel with a mean diameter of 36 inches changes speed from 300 rpm to 280
while it gives up 8000 ft-lb of energy. What is the coefficient of fluctuation.
A. 0.069
B. 0.015
C. 0.082
D. 0.020
ANSWER: A
30. A coupling consisting of two circular plates welded to the ends of two shafts is to be designed
using 2.54 cm diameter bolts to connect one plate to the other. The bolts are to be located at a
distance of 0.1524 m from the axes of the shafts. If the coupling is to transmit 4026.8 kw at a
shaft speed of 1200 rpm, how many bolts should be used in the coupling if the allowable shear
stress for the bolts is 103.43 Mpa?
A. Two
B. Three
C. Four
D. Five
ANSWER: C
31. A flange coupling is to be designed, using 25 mm diameter bolts at a distance of 152 mm from
the center of the shaft. allowable shearing stress on the bolt is 103 Mpa. if the shaft is to
transmit 5,600 hp at a speed of 1200 rpm, how many bolts are needed in the connection?
A. 2
B. 3
C. 4
D. 5
ANSWER: D
32. Find the diameter of the coupling bolts to connect shafts which are to transmit 3000 kw when
running at 100 rpm if 8 bolts are to be fitted on a pitch circle diameter of 610 mm and allowing
stress of 38 MN/m2 in the bolts.
A. 65.74 mm
B. 62.72 mm
C. 55.44 mm
D. 52.45 mm
ANSWER: B
33. A flange bolt coupling consist of eight steel 20 mm diameter steel bolts spaced evenly around a
bolt circle 300 mm in diamter. if the coupling is subjected to a torque of 15.1 KN-m, determine
the maximum shearing stress in the bolts?
A. 40450 kPa
B. 63320 kpa
C. 40054 kpa
D. 31298 kpa
ANSWER: C
34.  A cast iron flywheel with a mean diameter of 36 inches changes speed from 300 rpm to 280
while it gives up 8000 ft-lb of energy. What is the coefficient of fluctuation.
A) 0.069
 B) 0.015
C) 0.082
D) 0.020
ANSWER: A
35.  A 48 in diameter spoked steel flywheel having a 12 in wide x 10 in deep rim rotates at 200 rpm.
How long a cut (in inches) can be stamped in one inch thick aluminum plate if utimate shearing
strength of the aluminum is 40,000 lb/in^2. During stamping, the force exerted by the stamp
varies from a maximum F lb at the point of contact to zero lb when the stamp emerges from the
metal. Neglect the weight of the flywheel and spokes and use 0.28 lb/in^3 density for flywheel
material.
A) 43.2 in
B) 41.1 in
C) 44.5 in
D) 35.99 in
ANSWER: B
36. The cross-section of the flywheel arms is usually
A) L-section
B) rectangular
C) I-section
D) elliptical
ANSWER: D
37. It is used to connect two shafts which are perfectly aligned.
A) rigid coupling
B) bushed pin coupling
C) universal coupling
D) oldham coupling
ANSWER: A
38. It consists of a hollow cylinder whose inner diameter is the same as that of the shaft. It is fitted
over the ends of the two shafts by means of a gib head key.
A) universal coupling
B) Muff-coupling
C) oldham coupling
D) bushed pin coupling
ANSWER: B
39. It is used to join two shafts which have lateral misalignment.
A) oldham coupling
B) universal coupling
C) muff-coupling
D) bushed pin coupling
ANSWER: A
40. A flange bolt coupling has 10 steel 25.4 mm diameter bolts evenly tighten around a 415 mm bolt
circle. Determine the torque capacity of the connection if the allowable stress in the bolt is 50
MN/m2.
A) 59.95 KN.m
 B) 52.6 KN.m
C) 46.15 KN.m       
D) 43.8 KN.m
ANSWER: B
41. is used to connect two shafts whose axes intersect at a small angle.
A) hooked's coupling
B) Oldham coupling
C) bushed pin coupling
D) muff-coupling
ANSWER: A
42. This coupling may be used for heavy duty and moderate speeds.
A) muff-coupling
B) hooke's coupling
C) bushed pin coupling
D) oldham coupling
ANSWER: A
43. A 4 inches shaft using a flat key, whose width is 1 inch is transmitting a torque of 63,000 in.lb, if
the designed shearing stress is 5000 psi, determine the safe length of key
A) 6.3 inches
B) 5.3 inches
C) 4.3 inches
D) 7.0 inches
ANSWER: A
44. Is a flat key that is easy to facilitate easy driving and removal of the key
A) Square key
B) woodruff key
C) gib-head taper key
D) kennedy key
ANSWER: C
45. Universal coupling is:
A) Used for non-collinear shafts
B) Rigid coupling
C) Type of flange coupling
D) Used for collinear shafts
ANSWER: A
46. A flange coupling having an outside diameter of 200 mm connects two 45 mm shafts. There are
four 18 mm bolts on 138 mm bolt circle. The radial flange thickness is 25 mm. If the torsional
stress in the shaft is not exceed 40 Mpa, determine the power that can be transmitted at 1000
rpm.
A. 35 kW
B. 50 kW
C. 75 kW
D. 100 kW

ANSWER: C
47. A flange coupling having an outside diameter of 200 mm connects two 45 mm shafts. There are
four 18 mm bolts on 138 mm bolt circle. The radial flange thickness is 25 mm. If the torsional
stress in the shaft is not exceed 40 Mpa, at 1000 rpm. Determine the shearing stress in bolts
uniformly distributed.
A. 195.78 Mpa
B. 183.42 Mpa
C. 179.09 Mpa
D. 169.65 Mpa

ANSWER: B

48. flange coupling having an outside diameter of 200 mm connects two 45 mm shafts. There are
four 18 mm bolts on 138 mm bolt circle. The radial flange thickness is 25 mm. If the torsional
stress in the shaft is not exceed 40 Mpa, at 1000 rpm. Determine the maximum shearing stress
induced in the bolts.
A. 183.42 Mpa
B. 169.65 Mpa
C. 244.56 Mpa
D. 214.26 Mpa

ANSWER: C

49. flange coupling having an outside diameter of 200 mm connects two 45 mm shafts. There are
four 18 mm bolts on 138 mm bolt circle. The radial flange thickness is 25 mm. If the torsional
stress in the shaft is not exceed 40 Mpa, at 1000 rpm. Determine the bearing pressure in the
bolts.
A. 6.8 Mpa
B. 5.8 Mpa
C. 9.4 Mpa
D. 10.12 Mpa

ANSWER: B

50. Determine the mass moment of inertia in (kg-m-s^2) with respect to the axis of rotation, the
flywheel effect, and the radius of gyration of cast iron flywheel having the following
specification: Rim: OD = 1350 mm ; ID = 1050 mm, Face width = 325 mm, Hub: OD =
230 mm: ID = 105 mm, Length = 270 mm, Arms: 6 with 60 x 85 mm in cross-section and
considered as slender rods, L = 500mm. Material: Cast iron.
A. 492
B. 598
C. 669
D. 379

ANSWER: A
1. The shaft whose torque varies from 2500 to 6500 in-lbs has 2 in. in diameter and 65000 psi yield
strength. Compute for the shaft mean average stress.
A. 6036 psi
B. 2865 psi
C. 4138 psi
D. 1592 psi

ANSWER: B

2. A 1.5 in. diameter 60 ft steel rod carries a tensile load of 17,300 lbf. The elongation is 0.234 in.,
the modulus of elasticity is 3.1 x10^7 psi. Find the computed unstretched length.
A. 239.913 in.
B. 362.371 in.
C. 710.975 in.
D. 642.986 in.

ANSWER: C

3. A 1.5 in. diameter 60 ft steel rod carries a tensile load of 17,300 lbf. The elongation is 0.234 in. If
the modulus of elasticity is 250 Gpa, the unstretched length of the rod will become.
A. 6.097 m
B. 22.02 m
C. 11.87 m
D. 17.04 m

ANSWER: B

4. Determine the maximum deflection of 55 mm x 300 mm rectangular aluminum beam 8 meters

long subjected to a load acting downward at midpoint of 900 N. Note: a = 3 m.
A. 22.16 mm
B. 11.08 mm
C. 3.02 mm
D. 17.03 mm

ANSWER: A

5. Find the polar section modulus of hollow shaft with outside diameter 8.5 inches and inside
diameter 5.5 inches.
A. 39.76 in^3
B. 99.45 in^3
C. 45.32 in^3
D. 53.27 in^3

ANSWER: B

6. What is the bending moment if ft-lb at the fixed end of a 12 ft truss with a uniform weight of 120
lbf/ft and a concentrated vertical load at the free end of 1300 lbs?
 A. 17,000
B. 24,240
C. 11,111
D. 23,541

ANSWER: B

7. The bottom chord of a 12 m panel of a bridge consists of three steel eye-bars placed side by
side, each 175 mm by 35 mm. They jointly carry a pull of 1450 kN. The central bar is 0.85 mm
too short. Assuming the pins through the eyes to be parallel, what is the tensile stress of the
outer bar if there is an inequality in the length of the bars? Assume the bars to be of uniform
cross section for the entire length.
A. 75.81 Mpa
B. 110.37 Mpa
C. 78.91 Mpa
D. 115.55 Mpa

ANSWER: A

8. The bottom chord of a 12 m panel of a bridge consists of three steel eye-bars placed side by
side, each 175 mm by 35 mm. They jointly carry a pull of 1450 kN. The central bar is 0.85 mm
too short. Assuming the pins through the eyes to be parallel, what is the tensile of the central
bar if there is an inequality in length of the bars? Assume the bars to be uniform cross section
for the entire length.
A. 89.26 Mpa
B. 125.89 Mpa
C. 115.55 Mpa
D. 75.81 Mpa

ANSWER: A

9. A steel rod is stretched between two rigid walls and carries a tensile load of 6000 N at 35C. If the
allowable stress is not to exceed to 140 Mpa at -22C, what minimum diameter of the rod?
Assume coefficient of thermal Expansion of steel 11.7 x 10^-6 m/m-C.
A. 26.64 mm
B. 61.52 mm
C. 54.98 mm
D. 36.74 mm

ANSWER: B

10. The work cylinder of a hydraulic system is acted by a hydraulic pressure of 400 psi while the
maximum load of the piston is 6000 lbs. if the allowable tensile stress is 2500 psi, what is the
required wall thickness of the cylinder.
A. 0.448 in.
B. 0.564 in.
C. 0.125 in.
D. 0.383 in.
 ANSWER: D

11. The strength of the longitudinal joint is 520 kN, whereas for the girth joint it is 300 kN. What is
the maximum diameter of the cylindrical tank if the internal pressure is 2 Mpa.
A. 445 mm
B. 500 mm
C. 550 mm
D. 600 mm

ANSWER: D
1. Design the size of the steel shaft to be used for a 550 Hp, 300 rpm application if the allowable
torsion deflection is 0.98 degree and the allowable stress is 11,000 psi and modulus of rigidity is
14 x10^6 psi.
A. 4.75 in
B. 2.87 in
C. 3.77 in
D. 5.27 in

ANSWER: C

2. Design the length of the steel shaft to be used for a 550 Hp, 300 rpm application if the allowable
torsion deflection is 0.98 degree and the allowable stress is 11,000 psi and modulus of rigidity is
14 x10^6 psi.
A. 41.1 in
B. 35.2 in
C. 45.3 in
D. 38.1 in

ANSWER: A

3. A journal shaft has a diameter of 67 mm transmit 93 ¼ kW. Compute the linear speed of a pulley
65 cm mounted on the shaft.
A. 1870 ft/min
B. 1734 ft/min
C. 1582 ft/min
D. 1450 ft/min

ANSWER: B

4. Compute the speed of the gear mounted on a 55 mm diameter shaft receiving power from a
driving motor of 204.875 kW.
A. 2167 RPM
B. 2597 RPM
C. 1892 RPM
D. 1674 RPM

ANSWER: A

5. Two parallel shafts connected by pure coiling turn un the same direction and having speed ratio
of 3. What is the distance of the two shafts if the smaller cylinder is 25 cm in diameter?
A. 20 cm
B. 25 cm
C. 27 cm
D. 30 cm

ANSWER: B
6. It is desired to check the design of a 2.5 in medium steel shaft subjected to turning moment of
45,000 in-lb. Ultimate stress is 55,000 psi. determine the factor of safety applied.
A. 3.75
B. 1.96
C. 2.5
D. 2.75

ANSWER: A

7. A turbine developing 16,750 Hp and it turns the shaft at 350 rpm. The propeller which is
attached the shaft develops thrust of 170,000 lbs. A hollow steel shaft with an outside diameter
of 16 in. will be used. Determine the inside diameter of the shaft if the maximum shearing stress
based on the torsion alone is not to exceed 8000 psi.
A. 9.59 in
B. 7.86 in
C. 15.84 in
D. 13.25 in

ANSWER: C

8. A turbine developing 16,750 Hp and it turns the shaft at 350 rpm. The propeller which is
attached the shaft develops thrust of 170,000 lbs. A hollow steel shaft with an outside diameter
of 16 in. will be used. What is the diameter of the solid shaft?
A. 12.43 in
B. 15.89 in
C. 10.27 in
D. 13.56 in

ANSWER: A

9. A turbine developing 16,750 Hp and it turns the shaft at 350 rpm. The propeller which is
attached the shaft develops thrust of 170,000 lbs. A hollow steel shaft with an outside diameter
of 16 in. will be used. What is the percentage saving in weight over the solid shaft?
A. 92.71%
B. 96.71%
C. 74.49%
D. 87.34%

ANSWER: B

10. A taper pin with a minimum mean diameter of 8.2 mm will be applied to fix the lever to a 2.5 in
shaft with an allowable design stress of 16 ksi. Compute for the maximum torque in in-lbs. Use a
factor of safety 2.5.
A. 2611.88
B. 1398.80
C. 699.4
D. 1044.75
 ANSWER: D

11. An 18 ft steel line shaft has no bending action except its own weight. What power in Hp can the
shaft deliver at a speed of 250 rpm. Consider that the torsional deflection will not exceed 0.08/ft
length.
A. 36.95 Hp
B. 14.58 Hp
C. 30.65 Hp
D. 26.90 Hp

ANSWER: A

12. A 550 rpm shaft fitted with a 35 inches diameter pulley weighing 300 lbs. This pulley delivers 40
Hp to a load. The shaft is also fitted with a 26 inches pitch diameter gear weighing 220 lb. This
gear delivers 30 Hp to a load. Assume that the tension of the tight side of the belt is twice that
on the slack side of the belt, determine the concentrated loads produced on the shaft by the
pulley in lb.
A. 1132.35
B. 588.236
C. 523.85
D. 1085.77
ANSWER: D
13. A 550 rpm shaft fitted with a 35 inches diameter pulley weighing 300 lbs. This pulley delivers 40
Hp to a load. The shaft is also fitted with a 26 inches pitch diameter gear weighing 220 lb. This
gear delivers 30 Hp to a load. Assume that the tension of the tight side of the belt is twice that
on the slack side of the belt, determine the concentrated loads produced on the shaft by the
gear in lbs.
A. 264.44
B. 462.61
C. 484.44
D. 753.85
ANSWER: C
14. Determine the maximum length flexible steel wire shaft encased in a stationary tube that fits
closely enough to impose a frictional torque of 3 N-m/m. the wire has a diameter of 12 mm and
the induced stress must not exceed 145 MN/m^2.
A. 13.74 m
B. 16.40 m
C. 12.97 m
D. 11.65 m
ANSWER: B
15. Flexible steel wire shaft encased in a stationary tube that fits closely enough to impose a
frictional torque of 3 N-m/m. the wire has a diameter of 12 mm and the induced stress must not
exceed 145 MN/m^2. What will be the angular rotation of one end with respect to the other
end?
A. 132.75 deg
B. 136.83 deg
C. 139.65 deg
D. 142.95 deg
 ANSWER: B
16. A 12 mm x 12 mm key used in low speed shaft of a 25 kW speed reducer which rotates at 450
rpm. The shaft is 50 mm in diameter. Determine the shear stress in key assume length of the key
equal to 2 times the shaft diameter.
A. 31.2 Mpa
B. 17.68 Mpa
C. 25.87 Mpa
D. 34.97 Mpa
ANSWER: B
17. A 12 mm x 12 mm key used in low speed shaft of a 25 kW speed reducer which rotates at 450
rpm. The shaft is 50 mm in diameter. Determine the torsional stress in the shaft.
A. 26.68 Mpa
B. 17.68 Mpa
C. 31.2 Mpa
D. 21.62 Mpa
ANSWER: D
18. A shaft whose diameter is 60 mm rotating at a speed of 250 rpm and power to be transmitted is
45 kW at steady load. Assuming a 15 mm x 15 mm x 90 mm square key is used. Determine the
factor of safety used in the hey if yield point in shear is 260 Mpa.
A. 4.6
B. 5.6
C. 6.1
D. 3.8
ANSWER: C
19. The torsional capacity of a spline fitting is based on the maximum allowable pressure on the
active surface of the splines. The major diameter of the splined fitting is 80 mm, the minor
diameter is 65 mm, and the coefficient of friction is 0.15. the number of splines is 8. Considering
the pressure in the active surface to be 9 Mpa, determine the length of the spline needed for a
transmitted torque of 800 N-m.
A. 71 mm
B. 61 mm
C. 51 mm
D. 41 mm
ANSWER: C
20. The torsional capacity of a spline fitting is based on the maximum allowable pressure on the
active surface of the splines. The major diameter of the splined fitting is 80 mm, the minor
diameter is 65 mm, and the coefficient of friction is 0.15. the number of splines is 8. Considering
the pressure in the active surface to be 9 Mpa, determine the force required to slide the splines
axially under load.
A. 2.2 kN
B. 3.4 kN
C. 5.3 kN
D. 4.2 kN
ANSWER: B
1. Maximum speed ratio for V-belt.
A) 12:1
B) 10:1
C) 11:1
D) 13:1
ANSWER: B
2. These are used to transmit large powers at belt speeds above 22 m/s as in compressors and
generators.
A) Light drives
B) Medium drives
C) Heavy drives
D) small drives
ANSWER: C
3. materials for flat belt that are acid and waterproof and cannot withstand temperature higher
than 100C.
A) Rubber belts
B) Balata belts
C) Steel belts
D) leather belts
ANSWER: B
4. are made of cotton and are used for rough and short service.
A) balata belts
B) Rubber belts
C) steel belts
D) textile belts
ANSWER: D
5. Round belts are used singly, as from _______ mm the minimum allowable ratio of the diameter
of smaller pulley to the belt diameter is about 20, the recommended ratio is 30.
A) 4 TO 8
B) 5 to 10
C) 2 to 6
D) 4 to 10
ANSWER: A
6. The ultimate strength of leather belt varies from 21 to 35 MPa and a factor of safety may be
taken as ______. 
A) 5 to 9
B) 8 to 10
C) 10 to 12
D) 7 to 9
ANSWER: B
7. It has been found that for the efficient transmission of power, the belt speed _____ m/s may be
used.
A) 18 to 30
 B) 20 to 24
C) 20 to 22.5
D) 22.5 to 24.5
ANSWER: C
8. the power is transmitted between small shafts rotating in opposite direction.
A) Cross belt drive
B) Open belt drive
C) parallel belt drive
D) Chain belt drive
ANSWER: A
9. In order to obtain good results with flat belts, the maximum distance between the shafts should
not exceed 10 meters and the minimum should not be less than ____ times the diameter of the
larger pulley.
A) 2.5
B) 3.5
C) 4.5
D) 1.5
ANSWER: B
10. A pulley 600 mm in diameter transmits 40 kW at 500 rpm. The arc of contact between the belt
and pulley is 155, the coefficient of friction between belt and pulley is 0.35 and the safe working
stress of the belt is 2.1 MPa. Determine the belt tensions ratio, neglecting the effect of
centrifugal force.
A) 2.578
B) 2.857
C) 3.286 
D) 3.271
ANSWER: A
11.  _______are acid and waterproof and cannot withstand temperature higher than 100C.
A)  Steel belts
B) Balata belts
C) Rubber belts
D) Textile belts
ANSWER: B
12. ________ are made of cotton and are used for rough and short service.
A)  Steel belts
B)  Balata belts
C) Rubber belts
D) Textile belts
ANSWER: D
13.  _______made of rubber on a cotton-duck based are used where the belt is expose to the
weather or steam as they do not absorb moisture so readily as leather.
A)  Steel belts
B)  Balata belts
C) Rubber belts
 D) Textile belts
ANSWER: C
14. V-belt advantage is used for speed ratio as high as 10:1 and belts speed up to _______m/min.
A) 2000
B) 2100
C) 2200
D) 2300
ANSWER: B
15. Belt joints that made by the manufacturer to form an endless belt, is preferred than other joints.
A) Laced joint
B)  Hinged joint
C) Cemented joint
D)  None of the above
ANSWER: C
16. Belt joints that fastened to the belt ends and connected by a steel or fiber pin.
A)  Laced joint
B) Hinged joint
C)  Cemented joint
D) None of the above
ANSWER: B
17.  The cast iron pulleys are generally made with rounded rims. This slight convexity is known.
A) Round iron
B) crowning
C) idler
D) arm and hub
18. ANSWER: B
 These pulleys are usually used for belt transmission from electric motors, when the center to
center shaft distance is small.
A)  Steel pulleys
B) wooden pulleys
C) cast iron pulleys
D) paper pulleys
ANSWER: D
19. These pulleys have 2/3rd of the weight of cast iron pulleys of similar size.
A) Steel pulleys
B) Wooden pulleys
C) Cast iron pulleys
D)   Paper pulleys
ANSWER: B
20. The centrifugal tension prevents the use of V-belts at speeds below ____ m/s and above
____m /s.
A) 5 and 50
B) 10 and 100
C) 20 and 200
 D) 8 and 80
ANSWER: A
21. maximum velocity ratio of V-belt
A) 10
B) 11
C) 12
D) 13
ANSWER: A
22. V-belt groove angle is_____
A) 24-36 degrees
B) 20-30 degrees
C) 23-32 degrees
D) 19-34 degrees
ANSWER: A
23. V-belt provides longer life______
A) 2 to 4 years
B) 3 to 5 years
C) 3 to 6 years
D) 2 to 5 years
ANSWER: B

24. A single square thread power screw is to raise a load of 70 kN. The screw has a
major diameter of 36 mm and a pitch of 6 mm. The coefficient of thread friction
and collar friction are 0.13 and 0.10 respectively. If the collar mean diameter
is 90 mm and the screw turns at 60 rpm, find the combined efficiency of screw
and collar.
A. 13.438%
B. 12.526%*
C. 15.530%
D. 14.526%
ANSWER: B

25. What is the working strength of a 2” carbon steel bolt which is screwed up
tightly in a packed joint when the allowable working stress is 12000 psi?
A. 20120 lbs
B. 20443 lbs
C. 25347 lbs
D. 20200 lbs
ANSWER: C

26. What is the frictional Hp acting on a collar loaded with 100 kg weight? The
collar has an outside diameter of 100 mm and an internal diameter of 40 mm. The
collar rotates at 1000 rpm and the coefficient of friction between the collar
and the pivoted surface is 0.15.
A. 0.8 Hp
B. 1.4 Hp
C. 0.5 Hp
D. 1.2 Hp
ANSWER: B

27. Compute the deflection of an 18 coils helical spring having a load of 100 kg.
The modulus of elasticity in shear of spring is 96.62 GPa, outside diameter of
9.256 cm and wire diameter of 9.525 mm. The spring is squared and ground ends.
A. 19 mm
 B. 11 mm
C. 90 mm
D. 14 mm
ANSWER: C

28. A three extension coil springs are hooked in series that support a single weight
of 100 kgs. The first spring is rated at 0.400 kg/mm and the other 2 lower is
rated at 0.64 kg/mm. Compute the total deflection.
A. 562 mm
B. 156 mm
C. 668 mm
D. 256 mm
ANSWER: A
29. Two pulleys, 80 cm apart, carries a belt in an open connection. If the diameter
of the pulleys are 40 cm and 15 cm. What is the length of the belt needed?
A. 255 cm
B. 309 cm
C. 395 cm
D. 249 cm
ANSWER: D
30.The power screw is lifting a load of 4000 lbs. A 2.5 in. double square
thread with 2 threads per is to be used. The frictional radius of the
collar is 2 inches and the coefficients of friction are 0.10 for the
threads and 0.15 for the collar. The velocity of nut is 10 ft/min.
A. 1.21 Hp
B. 1.48 Hp
C. 1.35 Hp
D. 1.69 Hp
ANSWER: A
31.A spring is designed to fire a 2 kg projectile. The outside diameter of the
coil is 160 mm with an 18 mm wire and a total of 22 coils squared and
ground. The spring has a free length of 650 mm. When set or loaded, the
spring is compressed to a length of 450 mm. Determine the spring index and
Wahl factor.
A. 8.23 and 1.23
B. 7.88 and 1.23
C. 8.23 and 1.19
D. 7.88 and 1.19
ANSWER: D
32.In an open belt drive, the center distance between two pulleys is 300 mm.
If the pulley diameters are 20 mm and 100 mm respectively. Determine the
belt length?
A. 652 mm
B. 736 mm
C. 794 mm
D. 810 mm

ANSWER: C

33.Find the angle of contact on the small pulley for a belt drive with center
distance of 72 inches if pulley diameters are 6 in. and 12 in.,
respectively.

A. 180.60 deg
B. 203.61 deg
C. 243.40 deg
D. 175.22 deg
ANSWER: D
34.Determine the belt length of an open belt to connect the 6 cm and 12 cm
diameter pulley at a center distance of 72 cm.
 A. 172.39 cm
B. 184.39 cm
C. 160.39 cm
D. 190.39 cm
ANSWER: A
35.A 12 cm pulley turning at 600 rpm is driving a 20 cm pulley by means of
belt. If the total belt slip is 5%, determine the speed of the driving
gear.
A. 360 rpm
B. 382 rpm
C. 342 rpm
D. 364 rpm

ANSWER: C

36. An eyebolt is lifting a block weighing 350 lbs. The eyebolt is of SAE C1040 material with S U =67
ksi and Sy = 55 ksi, what is the stress area (in inches square) of the bolt if it is under the unified
coarse series thread?
A. 0.1341
B. 0.1134
C. 0.0991
D. 0.1043

ANSWER: B

37. Compute the working strength of 1 in. bolt which is screwed up tightly in packed joint when the
allowable working stress is 13,000 psi.
A. 3,600 lbs
B. 3,950 lbs
C. 3,900 lbs
D. 3,800 lbs

ANSWER: C

38. A 2” single thread, square screw has a TPI of 2 and coefficient of friction of 0.2. What is the
efficiency?
A. 31%
B. 44%
C. 35%
D. 55%

ANSWER: A

39. Determine the number of ½ in. diameter set-screw needed to transmit a 4 Hp at a shaft speed of
1000 rpm and the shaft diameter of 1 in.
A. 1
B. 2
C. 3
D. 4

ANSWER: A
40. Find the horsepower required to drive a power screw lifting a load of 4000 lbs. A 2 ½” double
square thread with two threads per inch is to be used. The frictional radius of the collar is 2
inches and the coefficient of friction are 0.1 for the threads and 0.15 for the collar. The velocity
of the nut is 10 ft/min.
A. 4.395 Hp
B. 3.459 Hp
C. 4.953 Hp
D. 5.935 Hp

ANSWER: A

41. A three extension coil springs are hooked in series that support a single weight of 100 kgs. The
first spring is rated at 0.4 kg/mm and the other 2 lower is rated at 0.64kg/mm. Compute the
total deflection.
A. 563 mm
B. 268 mm
C. 156 mm
D. 250 mm

ANSWER: A

42. Compute the maximum deflection of an 18 coils helical spring having a load of 100 kgs. The
modulus of elasticity in shear of springs is 98.62 GPa, OD of 9.256 cm and wire diameter of 9.525
mm. The spring is squared and ground ends.
A. 95 mm
B. 90 mm
C. 97 mm
D. 101 mm

ANSWER: B

43. An industrial fan running at 600 rpm is driven by a 25 kW, 960 rpm, induction motor. The pulley
mounted on the motor shaft is 270 mm. Center to center distance is 1.45 m and use f=0.35.
Determine the minimum angle of wrap and the length of the belt.
A. 3.0298 rad, 4006.7 mm
B. 4.0201 rad, 5000 mm
C. 3.0289 rad, 4007.6 mm
D. 4.0989 rad, 5010 mm

ANSWER: A

44. Steel pulleys, 120 mm and 530 mm in diameter are to transmit 2.5 kW at 1100 rpm of the
smaller pulley, through a single-ply oak-tanned leather belt. Use f=0.35 for oak-tanned leather,
allowable stress of 2.8 MPa, distance between shafts is 3000 mm and belt thickness of 3.215
mm. Determine the ratio of net tension.
A. 2.85
B. 5.82
C. 8.52
 D. 2.58

ANSWER: A

45. A coiled spring with 5 cm of outside diameter is required to work under the load of 190 N. The
wire diameter is 5mm, the spring is to have 6 active coils and the ends are to be closed and
ground. Determine the total number of coils. The modulus of rigidity is 80 GPa and the mean
radius is to be 23 mm, with 7 mm pitch of the spring.
A. 6
B. 7
C. 8
D. 9
ANSWER: C
46. A cantilever spring is composed of six graduated leaves each 60 mm wide and 12 mm thick. Find
the maximum induced stress if loaded with 8000N at the tip. Length of spring is 700 mm. Use E =
200 GPa.
A. 648.14 MPa
B. 684.41 MPa
C. 641.14 MPa
D. 468.41 MPa

ANSWER: A

47. The smaller of two concentric helical springs is made of 22 mm-diameter steel spring and has an
outside diameter of 100 mm with 10 active coils. The outer spring is made of 32 mm-diameter
steel spring and has an outside diameter of 250 mm with 8 active coils. Before the load is
applied, the outer spring is 25 mm longer than the inner spring. If the load of 90 KN is applied to
this nest of springs, find the spring rate of each spring in KN/m.
A. 507.5, 143.6
B. 31.5, 212.5
C. 493.8, 126.5
D. 976.1, 318.8
ANSWER: C
48. These are used to transmit large powers at belt speeds above 22 m/s as in compressors and
generators.
A) Light drives
B) Medium drives
C) Heavy drives
D) small drives
ANSWER: C
49. materials for flat belt that are acid and waterproof and cannot withstand temperature higher
than 100C.
A) Rubber belts
B) Balata belts
C) Steel belts
D) leather belts
 ANSWER: B
50. are made of cotton and are used for rough and short service.
A) balata belts
B) Rubber belts
C) steel belts
D) textile belts
ANSWER: D
1.A spur pinion rotates at 600 rpm and transmits 25
kW to a mating gear. The pitch diameter of the
pinion is 100 mm, and the pressure angle is 20 o.
Determine the tangential load, in N.
A.7660*
B. 6790
C. 3900
D.3098
2.A parallel helical gear-set consists of a 19-tooth
pinion driving a 57-teeth gear. The pinion has a
left-hand helix angle of 20o, a normal pressure
angle of 14½o, and a normal diametral pitch of 10
teeth/inch. If the pinion is to transmit 50 Hp at a
speed of 1750 rpm. Determine the center distance
of the two gears.
A.2.02 inches
B. 6.06 inches
C. 4.04 inches*
D.2.06 inches
3.Two shafts are connected by spur gears. The pitch
radii of the gears A and B are 207 mm and 842
respectively. If the shaft a makes 350 revolutions
per minute and is subjected to twisting moment of
 236 N.m what is the tooth pressure of the two
gears?
A.1177 N*
B. 1255 N
C. 890 N
D.878 N
4.A parallel helical gear set was a 17-tooth pinion
driving a 34-tooth gear. The pinion has a right-
hand helix angle of 30o, a normal pressure angle
of 20o, and a normal diametral pitch of 5 teeth/in.
Find the axial circular pitches.
A.1.2566 inches/tooth*
B. 1.6625 inches/tooth
C. 1.6526 inches/tooth
D.1.6256 inches/tooth
5.Two helical gears transmit 500 HP at 3600 rpm.
What should be the bore diameter of each gear be
if the allowable stress in gear shafts is 12500 psi?
A.1.252 in
B. 1.3275 in
C. 1.4568 in
D.1.5276 in*

6. Height of tooth above pitch circle or the radial distance

between pitch circle or the radial distance between
pitch circle and top land of the tooth.
 A. Top root
B. Addendum
C. Land
D. Hunting tooth
ANSWER: B
7. In involute teeth, the pressure angle is often defined as
the angle between the line of action and the line
tangent to the pitch circle. It is termed as:
A. Helix angle
B. Angle of recess
C. Angle of obliquity
D. Arc of action
ANSWER: C
8. In the selection of wire rope, regular lay means wires
and strands are arranged in the following manner:
A. Twisted in same direction
B. Twisted in any direction
C. Twisted in opposite direction
D. Twisted in along direction
ANSWER: C
9. The reciprocal of a diametral pitch or the ratio of pitch
diameter to the number of teeth.
A. Lead
B. Module
 C. Involute
D. Clearance
ANSWER: B
10. For an evenly distributed and uniform wear on each
meshing gear tooth, the ideal design practice is to
consider a _____________.
A. Wear resistance alloy addition to tooth gear
B. Heat treatment of gears
C. Hardening of each tooth
D. Hunting tooth addition
ANSWER: D
11. It is recommended for high speed application that
the minimum number of teeth in small sprocket should
be:
A. 26 to 30
B. 12 to 16
C. 26 to 28
D. 18 to 24
ANSWER: C
12. In gear design, the ratio of pitch diameter in inches
to the number of teeth:
A. Module
B. Diametral pitch
C. English module
 D. Circular
ANSWER: C
13. The concave portion of the profile where it joins the
bottom of the tooth space:
A. Fillet curve
B. Fillet radius
C. Bottom curve
D. Fillet
ANSWER: A
14. The distance of the tooth which is equal to the
addendum and dedendum”
A. Full
B. Whole depth
C. Working depth
D. Dedendum
ANSWER: B
15. In a gear design, the total work load must be equally
shared by its arms. Rim must be rigid to support these
arms and also the bead is recommended for its
stiffening value. The assumption in the detailed design
of rim thickness and depth of bead is ____ circular
pitch.
A. 0.65
B. 0.50
 C. 0.56
D. 0.44
ANSWER: C
16. Tooth width measured along the chord at the pitch
circle:
A. Flank
B. Face width
C. Width of space
D. Chordal thickness
ANSWER: D
17. The distance a helical gear or worm would thread
along its axis in one revolution if it were free to move
axially is called:
A. Length of action
B. Line of action
C. Land
D. Lead
ANSWER: D
18. In a pair of gears, ___________ is the plane
perpendicular to the axial plane and tangent to the
pitch surface.
A. Pitch
B. Pitch plane
C. Pitch circle
 D. Pitch point
ANSWER: B
19. The arbitrary modification by removing a small
portion of a tooth material at the tip of the gear tooth
is called:
A. Tip removal
B. Tip undercut
C. Tip relief
D. Pressure angle cut
ANSWER: C
20. In a pair of gears it is the plane that contains the two
axis, in single gear, it may be any plane containing the
axis and the given point.
A. Axial plane
B. Pitch plane
C. Normal plane
D. All of the above
ANSWER: A
21. The concave portion of the tooth profile where it
joins the bottom of the tooth space.
A. Fillet curve
B. Fillet
C. Undercut
D. Plane
 ANSWER: A
22. The length of arc between the two sides of a gear
tooth on the pitch circle:
A. Circular thickness
B. Axial plane
C. Helix angle
D. Chordal angle
ANSWER: A
23. In case of spur gears the flank of the tooth is:
A. The part of the tooth surface lying below the pitch
surface.
B. The curve forming face and flank.
C. The width of the gear tooth measured axially along
the pitch surface.
D. The surface of the top of the tooth.
ANSWER: A
24. In case of cross helical worm the axes of two shafts
are:
A. Parallel
B. Intersecting
C. Non-parallel
D. Non-parallel non-intersecting
ANSWER: D
25. In case of helical gears the axial plane is given by:
 A. Diametral pitch over the sine of helix angle
B. Diametral pitch over the cosine of helix angle
C. Diametral pitch over cotangent of helix angle
D. Diametral pitch over the tangent of helix angle
ANSWER: D
26. Determine the bending stress of wire rope with
drum diameter of 8 inches and wire diameter of 0.1
inch.
A.37.5 x 10^4 psi
B. 37.9 x 10^4 psi
C. 36.8 x 10^4 psi
D.38.2 x 10^4 psi
ANSWER: A
27. What power in kW is required to lift a load of 6000
lbs by means of a cable wrapped around the drum of a
hoist, the drum being 45 in. diameter and making 27
rpm?
A.43.14
B. 54.69
C. 56.97
D.45.98
ANSWER: A
28. As recommended the center to center distance
between sprockets not less than _____ times the
bigger sprocket.
A.1.5
B. 2.5
C. 1
D.2
ANSWER: A
29. Big chain sprocket wheels are designed with
spokes/arms are generally elliptical in cross section
with major axis ____ times the minor axis.
A.1.5
B. 2.5
C. 2
D.1
ANSWER: C
30. It is ideal for maximum quietness in sprocket drive
operation to choose___ or more teeth.
A.24
B. 27
C. 30
D.18
ANSWER: B
31. Consider a maximum safe center distance of
sprockets should be ______ pitches. Very long center
distance cause catenary tension in the chain.
A.65
B. 70
C. 75
D.80
ANSWER: D
32. For involute gear, parallel-axis gears with either
spur or helical teeth, is the rectangular area in the
plane of action bounded by the length of action
and the effective face width.
A. Zone of action
B. Path of action
C. Length of action
D. Involute action
ANSWER: A
33. It is the straight line passing through the pitch
point and tangent to both base circles.
A. Zone of action
B. Plane of action
C. Length of action
D. Line of action
ANSWER: D
34. The imaginary surface in which contact occurs
between two engaging tooth surfaces.
A. Surface of action
B. Plane of action
C. Length of action
D. Line of action
ANSWER: A
35. The distance of the line of action through which
the point of contact moves during the action of the
tooth profile.
A. Length of action
B. Plane of action
C. Surface of action
D. Arc of action
ANSWER: A
36. The arc of the pitch circle through which a tooth
profile moves from the beginning to the end of
contact with a mating profile.
A. Length of action
B. Plane of action
C. Surface of action
D. Arc of action
ANSWER: D
37. The arc of the pitch circle through which a tooth
profile moves from its beginning of contact until
the point of contact arrives at the pitch point.
A. Length of action
B. Arc of approach
C. Arc of recess
D. Arc of action
ANSWER: B
38. The arc of the pitch circle through which a tooth
profile moves from contact at the pitch point until
contact ends.
A. Length of action
B. Arc of approach
C. Arc of recess
D. Arc of action
ANSWER: C
39. The number of angular pitches through which a
tooth surface rotates from the beginning to the end
of contact.
A. Pitch ratio
B. Contact ratio
C. Tooth ratio
D. Speed ratio
ANSWER: B
40. The contact ratio in a transverse plane. It is the
ratio of the angle of action to the angular pitch.
A. Pitch ratio
B. Transverse contact ratio
C. Contact ratio
D. Speed ratio
ANSWER: B
41. The type of gear used to connect shafts that are
in the same plane and parallel. The teeth are cut
straight and parallel to the axis of the shaft
rotation.
A. Spur gear
B. Miter gear
C. Wheel
D. Bevel gear
ANSWER: A
42. Refers to the surface of the gear between the
fillets of adjacent teeth:
A. Top land
B. Bottom land
C. Pitch
D. Fillet
ANSWER: B
43. Effective face width of a helical gear divided by
gear axial pitch.
A. Face overlap
B. Teeth overlap
C. Land overlap
D. Pitch overlap
ANSWER: A
44. The curve formed by the path of a point on a
straight line as it rolls along a convex base curve.
A. Involute
B. Trochoid
C. Cycloid
D. Fillet
ANSWER: A
45. Gears whose teeth have a working depth equal
2.000 divided by the normal diametral pitch.
A. Stub teeth
B. Normal teeth
C. Full-depth teeth
D. Long teeth
ANSWER: C
46. The pinion shaft of a double reduction geared
turbine is 140 mm diameter, runs at 3000 rpm and the
stress in it is 48 MN/m2. The main shaft is 445 mm
 diameter and runs at 90 rpm. Assuming that the same
power is transmitted by both shafts, find the stress in
the main shaft.
A.50 mpa
B. 40 mpa
C. 60 mpa
D.30 mpa
ANSWER: A
47. A parallel helical gear-set consists of a 19-tooth
pinion driving a 57-teeth gear. The pinion has a left-
hand helix angle of 20o, a normal pressure angle of
14½o, and a normal diametral pitch of 10 teeth/inch. If
the pinion is to transmit 50 Hp at a speed of 1750 rpm.
Determine the center distance of the two gears.
A.2.02 inches
B. 6.06 inches
C. 4.04 inches
D.2.06 inches
ANSWER: C
48. A right-handed single-thread hardened-steel worm
has a catalog rating of 2.25 kW at 650 rpm when
meshed with a 48-tooth cast-steel gear. The axial pitch
of the worm is 25 mm, normal pressure angle is 14.5 o,
and the pitch diameter of the worm is 100 mm. The
coefficient of friction is 0.085. Determine the shafts
center distance.
 A.241 mm
B. 142 mm
C. 412 mm
D.124 mm
ANSWER: A
49. A 20o straight-tooth bevel pinion having 14 teeth and
a diametral pitch of 6 teeth/inch drives a 32-tooth
gear. The two shafts are at right angles and in the same
plane. The pinion is to transmit 1800 rpm and
transmitting 50 hp. Determine the pitch diameters of
the gears.
A.2.33 inches and 5.36 inches
B. 3.23 inches and 3.56 inches
C. 5.36 inches and 6.36 inches
D.2.33 inches and 2.33 inches
ANSWER: A
50. A triple threaded worm has a pitch diameter of 3
inches. The wheel has 25 teeth and a pitch diameter of
5 inches. Material for both the wheel and the wheel is
phosphor bronze. Determine the helix angle of the
gear.
A.11.31o
B. 13.11o
C. 11.13o
D.10.13o
ANSWER: A
1. Multi-disc clutch of 11 steel discs and 10 bronze discs, with effective outside and inside diameter
of 230 mm and 170 mm, respectively. If the shaft turns at 1600 rpm and an axial force of 750 N
is applied. Find the power in kW capacity, considering a coefficient of friction of 0.3.
A. 76
B. 89
C. 69
D. 95

ANSWER: A

2. Disk clutch with an outside diameter of 34 cm and an inside diameter of 14 cm is connected to

an engine that turns at 800 rpm. The coefficient of friction is 0.25 with pressure between the
friction surfaces is 6 kg/cm2. Compute the force on the clutch.
A. 2635.70 kg
B. 3769.91 kg
C. 1825.38 kg
D. 2961.98 kg

ANSWER: B

3. Disk clutch with an outside diameter of 34 cm and an inside diameter of 14 cm is connected to

an engine that turns at 800 rpm. The coefficient of friction is 0.25 with pressure between the
friction surfaces is 6 kg/cm2. Determine the power transmitted by the engine.
A. 78.32 kW
B. 88.39 kW
C. 98.33 kW
D. 101.28 kW

ANSWER: C

4. Band brake absorb 7.5 Hp at 300 rpm. The maximum pressure of the lining and the drum is 130
psi. The angle of wrap is 2.8 radians. The width of the band is 4 inches and f= 0.2. Find the
forces at the right side. The diameter of the drum is 10 inches.
A. 6300 lbs
B. 4500 lbs
C. 3800 lbs
D. 5200 lbs

ANSWER: D

5. Bearings of one cylinder are 155 mm and 300 mm long and support a load of 4500 kg. The
coefficient of bearings is 0.016 and crankshaft rotates at 500 rpm. Bearing diametral clearance is
0.160 mm. Determine the unit loading per bearing.
A. 73.5 psi
 B. 68.8 psi
C. 78.8 psi
D. 65.8 psi

ANSWER: B

6. Bearings of one cylinder are 155 mm and 300 mm long and support a load of 4500 kg. The
coefficient of bearings is 0.016 and crankshaft rotates at 500 rpm. Bearing diametral clearance is
0.160 mm. determine the friction loss per bearing.
A. 1.4 kW
B. 1.3 kW
C. 1.5 kW
D. 1.6 kW

ANSWER: A
7. A disc clutch has 6 pairs of containing friction surfaces. The frictional radius
is 2 in and the coefficient of friction is 0.3. An axial force of 100 lb acts on
the clutch. The shaft speed is 400 rpm. How much horsepower can the clutch
transmit?
A. 3.12
B. 5.21
C. 2.28
D. 4.51
ANSWER: C

8. How much torque can a cone clutch transmit if the angle of conical elements is
10 deg., the mean diameter of the conical clutch sections is 203 mm and an axial
force of 556 N is applied? Assume coefficient of friction of 0.45 between clutch
elements.
A. 148.35 N-m
B. 232.26 N-m
C. 213.43 N-m
D. 146.24 N-m
ANSWER: D

9. A simple band brake has a pull of 1800 N in the tight side while 675 N in the
slack side. The allowable tensile stress for the 2 mm thick band is 70 MPa.
Determine the band width.
A. 18.26 mm
B. 12.86 mm
C. 11.68 mm
D. 16.28 mm
ANSWER: B

10. The specific dynamic capacity of a roller bearing is 7500 lb. If subjected to an
equivalent radial load 1000 lbs, 1600 rpm. What is the expected life in millions
of revolutions?
A. 852.79
B. 825.79
C. 842.79
D. 835.79
ANSWER: B

11. A deep groove ball bearing has a specific dynamic capacity of 10400 lb. At 1500
rpm and a radial load of 1800 lb. What is the life of this bearing in hours?
A. 2043
B. 2243
C. 2143
 D. 2343
ANSWER: C
12. The name of the taper shank used on drills is:
A. Miller
B. Morse
C. Starrett
D. Stanley

ANSWER: B

13. If a drill is too great, it will:

A. not cut
B. cut faster
C. cut slower
D. close its temper

ANSWER: D

14. The correct cutting angle on a drill for ordinary work is:
A. 65 deg
B. 50 deg
C. 59 deg
D. 45 deg

ANSWER: C

15. A tool bit for cutting an American National thread should be ground with a
________.
A. 90 deg
B. 45 deg
C. 60 deg
D. 30 deg

ANSWER: C

16. Another name for hydrochloric acid is:

A. acetic acid
B. muriatic acid
C. nitric acid
D. sulfuric acid

ANSWER: B

17. The lathe compound is used for:

A. angle cutting
B. facing
C. grooving
D. any of the above

ANSWER: D

18. The usual value of helix angle of a drill is:

A. 30 deg
B. 60 deg
C. 45 deg
D. 90 deg
 ANSWER: A

19. A mechanism which usually does the indexing in a machine tool, is called:
A. indexing
B. dividing head
C. slotter
D. universal chuck

ANSWER: B

20. In drilling soft materials use cutting angle as low as 40 degrees but for
extremely hard material up to ________ degrees is recommended.
A. 65
B. 80
C. 75
D. 85

ANSWER: B

21. The usual shrinkage allowance specified for patterns to compensate for the expected shrinking of cast steel
parts construction of steel casting in cooling:
A. 1/8 inch/ft
B. 3/32 to 1/8 inch/ft
C. 3/16 inch/ft
D. 5/32 to 7/32 inch/ft
ANSWER: C
22. Torsional deflection is a significant consideration in the design of shaft and the limit should be in the range
of ___________ degree/foot of length
A. 0.4 to 1
B. 0.08 to 1
C. 0.1 to 1
D. 0.6 to 1
ANSWER: B

23. A cone clutch has an angle of 10 degrees and a coefficient of friction of 0.42. Find the axial force required
if the capacity of the clutch is 7.46 kW at 500 rpm. The mean diameter of the active conical section is 300
mm.
A. 0.40332 kN
B. 0.2453 kN
C. 0.3928 kN
D. 0.2384 kN
ANSWER: C
24. A multiple disk clutch has 9 plates having a contact surface of 50 mm. inside diameter and 100 mm. outside
diameter. If the coefficient of friction is 0.2 and the maximum average permissible normal pressure is 276
kPa. What is the required operating force?
A. 1,425.8 N
B. 1,525.8 N
C. 1,625.8 N
D. 1,725.8 N
ANSWER: C

25. With an electric arc welding rate of 12 inches per minute, how long will it take to weld a ¼ in thick plate by
4 ft long seam?
A. 2 min
 B. 4 min
C. 3 min
D. 5 min
ANSWER: B
26. Determine the most economical acetylene gas consumption in cu. ft to manually cut crosswise a 4 ft x 20 ft
x 1 in thick steel plate into five sheets of 4 ft x 4 ft x 1 in steel plate. The manual cutting rate of oxy-
acetylene gas cutter is 12 min in 11 ft to 16 ft length of steel plate. Oxygen consumption is 60 cu. ft and
acetylene gas rate is 10 cu. ft per hour
A. 2.4
B. 7.2
C. 3.5
D. 9.5
ANSWER: A
27. A simple band brake has a pull of 1800 N in the tight side while 675 N in
the slack side. The allowable tensile stress for the 2 mm thick band is 70
MPa. Determine the band width and its corresponding tension ratio.
A. 15.28 mm and 2.88
B. 12.86 mm and 2.67
C. 15.28 mm and 2.67
D. 12.86 mm and 2.88

ANSWER: B

28.A cone clutch with mean diameter of 250 mm, if the conical elements are
inclined 8° and the axial force is 450 N. The rotational speed of the
driver is 200 rpm and the coefficient of friction is 0.20, determine the
torque transmitted for uniform wear.
A. 80.83 N-m
B. 85.19 N-m
C. 89.27 N-m
D. 93.28 N-m

ANSWER: A

29.Determine the most economical oxygen gas consumption in cu. ft to manually

cut lengthwise a 4 ft x 20 ft x 1 in thick steel plate. Oxy-acetylene gas
used is 6 cu. ft and oxygen gas rate is 130 ft3/hr.
A. 15
B. 25
C. 19
D. 29
ANSWER: D
30. How long will it take to saw a rectangular piece of steel
plate size ½ “ x 4’ x 8’ the length of cut is 4 ft. The power
hacksaw makes 120 rpm and the feed per stroke is 0.008 in.?
A. 48 min.
B. 50 hr
C. 0.83 hr
D. 52 min.
ANSWER: C
31. For gear cutting which cutter is used?
A. End mill cutter
B. Plain milling cutter
C. Form relieve cutter
D. All of the above
 ANSWER: C

32. In a slotter, the table gets ___ different feeds

A. One
B. Two
C. Three
D. None of the above
ANSWER: C

33. If a clearance of a cutting edge is 15 deg, the lip (wedge) angle

in 75 deg, the rake angle will be
A. 80 deg
B. 70 deg
C. 10 deg
D. None of the above
ANSWER: C
34. The approximate hardness of HSS end mill cutter is
A. 45 HRC
B. 52 HRC
C. 62 HRC
D. 72 HRC
ANSWER: C
35. When the feed motion takes place in a slotting machine
A. during the cutting motion.
B. after each forward stroke.
C. at the end of return motion.
D. after each double stroke.
ANSWER: D
36. Which of the following conditions may cause error during
knurling?
A. to much longitudinal feed.
B. clamped length of tool too short.
C. surface speed too low.
D. unnecessary support with tail stock center.
ANSWER: A
37. Mark the milling method during which the formation of the chatter
marks is very likely
A. during down cut milling with a straight tooth cutter.
B. during up cut milling with a straight tooth cutter.
C. during face milling with a straight tooth cutter.
D. while using spiral tooth cutter.
ANSWER: B
38. Mark the cutter which works simultaneously with up cut and down
cut process
A. Side milling cutter.
B. Semi-circular milling cutter.
C. Shell end mill.
D. Plain milling cutter.
ANSWER: C

39. A polygon with 9 flats is to be milled using the indexing head.

The indexing head transmission ratio is 40:1.Determine the number
of crank rotation and mark the correct answer
A. 9 full rotation.
B. 5 full rotation, 2 holes on the 36 hole circle.
C. 4 full rotation, 12 holes on the 27 hole circle.
D. 2 full rotation, 16 hole on the 47hole circle.
ANSWER: C

40. Where the relieved cutters are reground?

A. on the circumstances
B. relieved cutters are not reground
C. on the flank
D. on the side faces
ANSWER: C
41. What happens if the job is loosely fitted between centers in
cylindrical grindings?
A. the job will be out of round.
B. the job will be oversize.
C. the job will be thrown out.
D. the job will not rotate.
ANSWER: A

42. Internal and external taper on cylindrical jobs are ground in

A. plain cylindrical grinding machine.
B. universal cylindrical grinding machine.
C. internal grinding machine.
D. centreless grinding machine.
ANSWER: B

43. Which of the following is used to clean the gauge blocks before
and after use?
A. Brush
B. Cotton waste
C. Chamois leather or linen cloth
 D. None of the above
ANSWER: C
44. The function of clutch in the machine tool is?
A. lowering of drive speed
B. to disconnect or connect at will the drive
C. alignment of drive shaft
D. to insure that two shaft line up at high speed
ANSWER: B

45. The rule of thumb in journal bearing design; the clearance

ratio/clearance should be.
A. 0.0090
B. 0.0010
C. 0.0042
D. 0.00120
ANSWER: B

46. Cold rolled shafting is not available in diameter larger

than__________
A. 6 inches
B. 6 ½ inches
C. 5 inches
D. 5 ½ inches
ANSWER: C
47. Hand taps are provided in sets of three called:
A. taper, plug and end
B. taper, plug and bottom
C. short, taper and bottom
D. short, medium and long
ANSWER: B
48. When preparing to tap a hole, the size of the drill will be
A. equal to the size of the tap
B. larger than the size of the tap
C. smaller than the size of the tap
D. none of the above
ANSWER: C
49. The grade of grinding wheel depends upon
A. Grain size
B. Structure
C. Kind of abrasive
D. Hardness of bond
ANSWER: D

50. Which kind of bond is commonly used?

A. Vitrified
B. Rubber
C. Shellac
D. None of the above
ANSWER: A