1. Calculate the maximum deflection of a 12m beam with fixed 8.

8. Four cylinders rolling in opposite direction has a speed ratio

ends if the load applied on it is 3 KN located at its center. (l = of A,B,C,D=5:3:1:4. If center distance between cylinder A and
4,200,000 mm4, E=200 GPa). C is 70 inches, find diameter of cylinder D,
a. 128.6mm c. 0.17mm A.16.376 in C.26.34 in
b. 32.14mm d. 0.27mm B.12.45 in D.18.75 in

2. A 12cm x 16cm air compressor is operated with maximum 9.It is the outer surface or the pulley is made in convex for to
pressure of 10 kg/cm2. There are 5 bolts with yield strength of keep the belt in center when it is in motion
64 ksi holding the cylinder head to the compressor. Determin A. creep B. crowning
the tensile C. dressing D. slip
a.26.59 MPa b.27.96 MPa
c.28.54 MPa d.32.56 MPa 10.A 2 1/2inches double square thread with two threads/inch is
to be used The frictional radius of the collar is 2 inches and
3.All four compression coil spring support one load of 400 kg. the coefficients of fiction are 0.10 for the threads and 0.15 for
All four springs are arranged in parallel and rated same at the collar. The velocity of the nut is 10 ft/min. for the threads
0.709 kg/mm.Compute defiection in mm and load 4000lbs.Find the efficiency of the screw
a.564 b.1457 A.25.58% C.27.65%
c.171 d.141 B.26.58% D.28.58%

4.What horsepower is required to lift a load of 5000 lbs by a 11.The “tang” of a file is the part that.
cable wrapped around the drum of a hoist the drum being 40in. A.Does the cutting
in diameter and making 24 rpm? B.Fits into the handle
A.28 C.18 C.has no teeth
B.50 D.36 D.is opposite the handle

5.A 1200 mm cast iron pulley is fastened to a 112.5 mm shaft 12.A 19 mmstud bolts used to fastened on a 250 mm diameter
by means of a 28.13 mm square key that is 175 mm long. The cylinder head of diesel engine. If there are 10 stud bolts,
key and the shaft made of SAE 1030 steel, annealed determine the pressure inside the cylinder if bolt stress is 50
(Sy=49ksi, Su=67ksi). What force acting at the pulley will shear Mpa
this key? A.188.8 KPa C.2888 KPa
A16,304 kg b.40,361 kg B.3426 KPa D.4828 KPa
C.61,304 kg d.30,461 kg
13.A 16 mm plate tapped over and secured b y fillet weld on
6.A double threaded worm gear transmits 15hp at 1150rpm. the inside and outside to form a penstock 1.5 m diameter. An
The pitch of the worm is 0.75 inches and pitch diameter of allowable stress of 140mpa on the 14 mm fillet weld he internal
3inches. The pressure angle is 141/2o and the coefficient of pressure that can be carried by the welded joint.
friction is 0.12, Find the worm gear efficiency A.1.38Mpa C. 3.38Mpa\
A.55.13% C.58.34% B. 2.38Mpa D.4.38Mpa
B.50.23% D.60.34%
14.A rectangular key was used in pulley connected to a line
7.A helical compression spring has a scale of 400 lbs/inch, an shaft with a power of 7.46 in a speed of 1200, rpm lf the
inside diameter of 2.5 inches, a free length of 8 inches and shearing stress of then shaft and key are 30 mpa and 240 Mpa
with squared and ground ends, Material is to be chrome , respectively is the length of the rectangular key if the width is
vanadium steel with working stress of 63,000 psi and G = one four that of the shaft diameter
10,800,000 psi. For a load of 825lbs, and for average service. A.3.24 mm C.5.24 mm
Wahls factor, k=1.25, determine the number of active coils. B.4.24mm D.6.24mm
A. 8.23 C.5.34
B.11.23 D.7.81 15.A mechanical press is used to punch 6 holes per minute on
a 25 mm thick plate. The hole in 25mm in diameter and the
plate has an ultimate strength in shear of 420 Mpa. The normal is 7196.60 kg/m. The arms and account 10% of the rim weight
operating speed is 200rpm and it slows down to 180 rpm concentrated at mean diameter. Determine the thickness of the
during the process of punching. The fly wheel has a mean rim.
diameter of one meter and the rim width is 3 times the a. 0.145 cm c. 0.764 cm
thickness. Assume that the hub and is arm account for 5% of b. 0.345 cm d. 0.587 cm
the rim weight concentrated at the mean diameter and density
of cast iron is 7,000 kg per cubic meter. Find the flywheel 21. Big chain sprocket wheels are designed with spokes/arms
weight. are generally elliptical in cross section with major axis _______
A.3.23 KN C.7.38KN times the minor axis.
B.5.39 KN D.9.71KN a. 2 c. 1-1/2
b. 2 ½ d. 3
16.A solid transmission shall 3.5 inches in diameter. It is
desired to replace it with a hollow shaft as much as the same 22. A dumb waiter designed to travel a height of 3m when
torsional strength but its weight should only be half as much as loaded will have a maximum gross weight of 100 kg. A coil
the solid shaft. Find the outside diameter of the shaft spring is provided below to absorb shock in the event that the
A.4.23in C.7.38in dumb waiter should fall freely because of sudden breakage of
B.5.34in D.9.30in the wire rope carrying it. If the coil spring will be deflected to
30.48 cm, if the dumb waiter should accidentally fall and it hit
17. A band brake is installed on at 250 rpm and a diameter of the spring from its maximum height of travel, determine the
900 mm . the angle of contact is 1.5 radians and one end of number of active coils.
the b rake band is fastened to a fixed pin while the other end a. 10.20 c. 16.34
to the brake arm 150 mm from the fixed pin . The coefficient b. 14.23 d.18.34
of friction is 0. 25 and the straight brake arm is 1000 mm a
long and is placed perpendicular to the diameter bisecting the 23. A electric motor running at 1200 rpm drives a punch press
angle of contract Determine the width in millimeters if. The shaft at 200 rpm by means of a 130 mm wide and 8 mm thick
maximum tensile stress is 55Mpa and thickness is 3.0mm belt. When the clutch is engaged the belt slips. To correct this
A.37 C.41mm condition, an idler pulley was installed to increase the angle of
contact but the same belt and pulley were used. The original
18.A single threaded metric thread has a pitch of 4mm and a contact angle on the 200 mm motor pulley is 160 degrees. The
mean diameter of 18mm it is used as a translation screw in original tension ratio is 2.4 and the net tension is 12 N/mm of
conjunction with a collar having an outside diameter of 37 mm the belt width. If the increase in transmission capacity of 20%
and an inside diameter of 27 mm The load is 400 kg and will prevent slippage, determine new angle of contact.
coefficient of friction is 0.3 for both threads and collar. Find the a. 210o c. 230o
total torque b. 220o d. 240o
A.1083 kg-mm C.3321 kg-mm
B.2089kg-mm D.4873kg-mm 24. A double thread ACME thread screw driven by a motor at
400 rpm raises the attached load of 900 kg at a speed of 10
19. The application of electrical current to the corrosion circuit m/min. The screw has a pitch diameter of 36 mm. The
to counter the corrosion reaction is called coefficient of friction on threads is 0.15. The friction torque on
A. cathodic protuction the thrust bearing of the motor is taken as 20% of the total
B. sacrificial anodes method torque input. Determine the motor power required to operate
C. chemical corrosion process the screw.
D. galvanic action a. 1.239 kW c. 3.110 kW
b. 2.239 kW d. 4.239 kW
20. It is found that a shearing machine requires 205 joules of
energy to shear a specific gauge of sheet metal. The mean 25. A helical gear has 30 teeth and a pitch diameter of 280mm.
diameter of the flywheel is to be 76.20. The normal operating Gear module is 8 and pressure angle normal to tooth is 20 o.
speed is 200 rpm, and slows down to 180 rpm during shearing The force normal to the tooth surface is 4500 N. Determine the
process. The rim width is 30.48 cm, and the weight of cast iron kW transmitted at 620 rpm.
 a. 43.49 kW c. 34.94 kW 32. A simple band brake has a 76 cm drum and fitted with a
b. 44.93 kW d. 49.43 kW steel band 2/5 cm thick lined with a brake lining having a
coefficient of friction of 0.25. The arc of contact is 245o. The
26. The smaller of two concentric springs is made of 22 mm drum is attached to 60 cm hoisting drum that sustain a rope
diameter steel spring and has an outside diameter of 100 mm load of 820 kg. The operating force has a moment arm of 1.50
with 10 active coil. The outer spring is made of 32 mm steel m and the band is attached 12 cm from the pivot point. Find
spring and has an outer diameter of 250 mm with 8 active the operating force of the end of brake arm.
coils. Before the load is applied, the outer spring is 25 mm a. 773.80 N c. 777.80 N
longer than the inner spring. If the load of 90 kN is applied to b. 775.80 N d. 779.80 N
the nest of the springs (G=80GPa). Find the spring rate of the
outer spring. 33. A spherical tank has a diameter of 10 m. If the tangential
a. 126.50 kN/m c. 146.50 kN/m stress of the tank is 16 MPa, find the maximum internal
b. 136.50 kN/m d. 156.50 kN/m pressure that the tank can carry if the wall thickness is 25.4
mm.
27. Calculate the factor of safety resulting from the following a. 315.2 kPa b. 264.3 kPa
stress values: yield strength, Sy = 60 ksi; endurance strength, c. 162.6 kPa d. 143.2 kPa
Sn = 20 ksi, average stress, Sm=15 and alternating stress, Sa =
10 ksi. 34. A mechanical press is used to punch 6 holes per minute on
a. 0.92 c. 1.33 a 25 mm thick plate. The hole in 25 mm in diameter and the
b. 2.17 d. 1.11 plate has an ultimate strength in shear of 420 MPa. The
normal operating speed is 200 rpm and it slows down to 180
28. A helical gear having 14 ½ degree normal pressure angle rpm during the process of punching. The fly wheel has a mean
and transverse diametral pitch of 2.3622 per cm, the helix diameter of one meter and the rim width is 3 times the
angle is at 45o and has 8 teeth. Compute the transverse thickness. Assume that the hub and is arm account for 5% of
pressure angle in degrees. the rim weight concentrated at the mean diameter and density
a. 22.2 c.18.9 of cast iron is 7,000 kg per cubic meter. Find the power
b. 19.3 d. 20.1 required to drive the press.
a. 0.833 kW c. 1.56 kW
29. The torsional deflection of SAE 1040 steel is 0.8 o in a b. 1.031 kW d. 2.13 kW
length of ½ m . The shear stress is 69 MPa. Compute the
diameter of the shaft in mm. The modulusof elasticity of steel is 35. A bevel gear speed reducer with 18 teeth on the pinion and
79 GPa. 99 teeth on the gear, both being hardened alloy steel. The
a. 73mm b. 63 mm module is 6 and the width of the face is 58mm. The rating
c. 93 mm d. 83 mm listed is 40 kW at 900 rpm of the pinion. Determine the cone
distance.
30. Compute the speed of the gear mounted on a 52.5 mm a. 202 mm c. 101 mm
diameter shaft receiving power from a 250 hp driving motor. b. 302 mm d. 404 mm
a. 1076 rpm b. 1253 rpm
c. 1563 rpm d. 1852 rpm 36. Compute for the load in KN on a 3 cm diameter 100 cm
long steel rod if its maximum elongation exceeds 0.12.
31. A flange coupling connects two 2” diameter shafts. The a. 178 b. 196
flanges are fitted with 6 bolts of SAE 1040 steel on a 7“ bolt c. 148 d. 287
circle. The shafts runs at 300 rpm and transmit 45 hp. Assume
a factor of safety of 5, ultimate tension of 70,000 psi and 37. A cylindrical tank has an inside diameter of 5 in and is
ultimate shear of 50,000 psi. Determine diameter of the bolt subjected to internal pressure of 500 psi. If maximum stress is
required. 1200 psi, determine the required thickness.
a. 0.228 in c. 0.428 in a. 1.4 in c. 1.0 in
b. 0.328 in d. 0.528 in b. 1.2 in d. 1.6 in
38. A thickness of cylindrical tank is 50 mm. The internal a. 0.159 c. 0.246
diameter is 300 mm and has a internal stress of 8423.58 kPa. b. 0.625 d. 0.189
Determine the maximum internal pressure.
a. 2071.51 kPa b. 2514.76 kPa 47. A lathe machine operation used to produce straight,
c. 3054.19 kPa d. 2358.41 kPa conical, curved a grroved work pieces such as shafts, pins,
handles, and various machine components.
39. The pressure inside the cylindrical tank varies from 800 a. facing b. turning
kPa to 3200 kPa continuously. The diameter of shell is 1.6m. c. knurling d. drilling
Find the wall thickness if yield point is 460 MPa, endurance
strength is 200 MPa and factor of safety of 3. 48. A type of saw which have long, flexible, and continuous
a. 18.34 mm c. 20.45 mm blades and have a continuous cutting action.
b. 24.83 mm d. 28.45 mm a. hack saw b. band saw
c. circular saw d. none of the above
40. A spur gear 20 degrees full- depth involute teeth has an 49. A rail having a coefficient of linear expansion of 11.6 x 10-6
outside diameter of 195 mm and a module of 6.5. Determine m/moC increases its length when heated from 70 oF to 133oF.
the number of teeth. Determine the strain.
a. 20 c. 28 a. 2.04 x 10-4 c. 4.06 x 10-4
b. 25 d. 41 b. 6.05 x 10-4 d. 2.77 x 10-4
41. A standard 20 degrees full-depth spur gear has a 24 teeth
and circular pitch of 0.7854 in. Determine the working depth. 50. A spring has a load of 50 lb with a spring index of 8. If
a. 0.25 in. c. 0.50 in. stress induced is 90,000 psi, determine the wire diameter.
b. 0.45 in. d. 0.60 in. a. 0.058 in c. 0.452 in
b. 0.0828 in d. 0.1157 in
42. A shaft whose torque varies from 2200 to 6400 in-lb. It has
a diameter of 1.25 inches and yield stress of 63,000 psi. Find 51. A shaft revolving at 1740 rpm is supported by a bearing
the variable component stress. with a length of 105 mm and a diameter of 64 mm. If the load
a. 6524.45 psi b. 4245.56 psi is light and SAE Oil No. 20 is used with an average
c. 5475.95 psi d. 7834.56 psi temperature of 65 C and diametral clearance is 0.136 mm,
what would be the loss of power due to friction? Express your
43. A 21 tooth sprocket is connected to a 63 tooth sprocket by answer in kW.
means of RC 60 having 180 inches. Determine the distance A. 0.117 kW c. 0.174 kW
between the sprockets in inches. B. 0.147 kW d. 0.714 kW
a. 51.5 in b. 47.6 in
c. 62.2 in d. 58.4 in 52. A spring sustain 200 ft-lb of energy with deflection of 3 in.
Assume that the main coil diameter is 7 times the wire
44. A 76 mm solid shaft is to be replaced by a hollow shaft of diameter and allowable stress of 100,000 psi, determine the
equal torsional strength. Determine the percent savings in wire diameter.
weight by using hollowshaft. Outside diameter of the hollow a. 0.416 in c. 0.568 in
shaft is 100 mm. b. 0.32 in d. 0.672 in
a. 56.74% b. 55.85%
c. 58.85% d. 53.56% 53. A flanged bolt coupling has ten (10) steel 25.4 mm
diameter bolts evenly tighten around a 415 mm bolt circle.
45. What power should short shaft , 50 mm in diameter, Determine the torque capacity of the connection if the
transmits at 750 rpm? allowable shearing stress in the bolt is 50 Mn/m2.
a. 110 kW b. 100 kW a. 42.3 kN-m b. 52.57 kN-m
c. 80 kW d. 60 kW c. 50 kN-m d. 57.25 kN-m

46. a 20 degrees full-depth gear has tooth thickness of 0.25 in. 54. A concentric helical spring is use to support load of 90 KN.
find the addendum distance. The inner spring has spring rate of 495.8 KN/m and outer
spring is 126.5 KN/m. IF initially the inner spring is 25 mm 61. It is a necessary inter-atomic bond between adjacent
shorter than the other spring, find the percent load carried by molecular dipoles, which may be permanent or induced.
inner spring. a. Van der Waals Bond b. covalent bond
a. 34.65% c. 86.25% c. ionic bond d.none of these
b. 55.86% d. 76.81%
62. The yield strength of a regular yellow brass (65 to 70% Cu,
55.Determine the safe wall thickness of a 30 inches steel tank 30 to 35% Zn) can be increased/improved by:
with internal pressure of 7.82 MPa. The yield stress of material a. tempering c. cold working
is at 275.48 Mpa. The factor of safety to use is 2.0. b. chill casting d. heat treatment
a. 20.6 mm b. 21.6 mm 63. It is a process of butt welding in which the major portion of
c. 22.6 mm c. 23.6 mm the heat required for the welding operation is derived from the
arcing that occurs in the space between the parts to be joined.
56. A band brake is to absorb 5 hp at 200 rpm. The maximum a. tack welding c. ultrasonic welding
pressure of the lining and drum is 120 psi. The width of the b. flash welding d. none of the above
band is 3 inches and the coefficient of friction f=0.15. Find the
maximum band tension. The diameter of the drum is at 8 64. It is the surface damage which results when two surfaces
inches. in contact slight periodic relative motion.
a. 1680 b. 1440 a. corrosion fatigue b. wear
c. 2440 d. 2980 c. fretting d. none of the above

57. Compute the shear modulus of elasticity G of steel whose 65. A bevel gear of the same size mounted on shafts at 90
modulus of elasticity E is 200 GPa and Poisson’s ratio v is degrees
0.30. a. crown gear b. spur gears
a. 23.923 GPa b. 92.763 GPa c. angular gears d. miter gears
c. 76.923 GPa d. 67.923 GPa
66. Which of the following hardness tests measures the
58. A square and ground spring ends spring has a free length hardness of the specimen in relation to the depth of
of 250 mm. There are 10 active coils with the wire diameter of penetration?
12.5mm. If the spring rate is 150 KN/m ad mean diameter is a. Brinell hardness test
100 mm, determine the solid stress. b. Rockwell hardness test
a. 2315.54 MPa b. 7654.80 MPa c. Shore’s scleroscope test
c. 7842.70 MPa d. 8432.90 MPa d. Vickers’s hardness test

59. A solid steel 50mm diameter and 300mm long at 67. SAE steel that responds to heat treatment.
temperature of 25C is firmly secured at each end so that the A. SAE 1060 c. SAE 1030
expansion is fully restricted. Taking the coefficient of linear b. SAE 1117 d. SAE 1020
expansion of steel as 1.2 x 10 -5 C and its modulus of elasticity
as 206 GN/m2. Determine the stress set-up if it is heated to 68. To reduce cost in manufacturing of large worm gears the
150 C. materials to utilize:
a. 390 x 106 N/m2 c. 309 x 106 N/m2 a. alloyed aluminum rim with cast iron spider
b. 410 x 106 N/m2 d. 145 x 106 N/m2 b. bronze rim with cast steel spider
60. A prismatic bar at 500 F is embedded in a rigid concrete c. all of these
wall. The bar is 40 degree long and has a cross sectional area d. cast iron with bronze spider
of 0.4 in2. What is the axial force in the bar if its temperature is
reduced to 100 F? The coefficient of thermal expansion is 5 x 69. ______________ is one in which of the rigid
105 F. members/bodies joined together to form a kinematic chain.
a. 5000 lb b. 8000 lb a. all of these b. link
c. 24,000 lb d. 32,000 lb c. frame d. coplanar
70. A steel pulley with a mean radius of 120 mm is rotated at a A safety valve spring having 9-1/2 coils has the ends
speed of 1100rpm. If the mass of the rim is 5kg, what is the squared and ground. The outside diameter is 115 mm and the
centrifugal force? wire diameter is 13 mm. It has a free length of 203 mm. The
spring must be initially compressed to hold the boiler pressure
a. 7961.5 N b. 9632.5 N
of 1.38 MPa on the valve seat of 32 mm diameter. Modulus of
c. 5231.5 N d. 4265.5 N rigidity is taken as G=80 or 60 GPa. Determine:
81. The force acting on the spring.
71. The differential of the shear equation is which on the a. 0.811 KN or 0.611 c. 1.45 KN
following: b. 1.11 KN d. 1.87 KN or 1.67
a. bending moment of the beam 82. The spring index.
b. tensile strength of the beam a. 6.85 c. 8.85
b. 7.85 d. 9.85
c. tensile strength of the beam
83. The coil deflection
d. load of the beam a. 31 mm c. 35 mm
b. 33 mm d. 45 mm
72. The maximum stress that a member subjected to a 84. The compressed length of spring
completely reversed load can withstand for an infinite number a. 142 mm c. 162 mm
of load applications without failure. b. 152 mm d. 172 mm
a. alternating stress c. endurance limit
85. The length of arc between the two sides of a gear tooth on
b. finite stress d. ultimate stress
the pitch circle.
a. axial plane c. helix angle
73.MALABO b. circular thickness d. chordal angle

An open belt drive connects a 450 mm driving pulley 86. The path of contact in involute gear when force or power is
to another driven pulley 1000 mm in diameter. The belt is 300 actually transmitted. It is a straight imaginary line no passing
mm wide and 0 mm thick. The coefficient of friction of the belt through the pitch and tangent to the base circle.
drive is 0.30 and the mass of the belt is 2.8 kg per meter of belt a. principal reference plane c. pitch point
length. Other data are as follows: b. front angle d. line of action
Center distance bet shafts = 4 m
Maximum allowable tensile stress of belt = 1500 kPa 87. The main bearings of a one cylinder steam engine are 152
Speed of driving pulley = 900 rpm mm diameter and 280 mm long and support a load of 4400 kg.
Determine: The bearings are well ventilated and are heavy in construction.
74. The belt density in lb/in3 The coefficient of friction in bearings is 0.017 and crankshaft
a. 0.014 c. 0.034 rotates at 450 rpm. Bearing diametral clearance is 0.152 mm.
b. 0.024 d. 0.044 Determine the friction loss per bearing.
75. The belt speed in fps a. 1.314 kW c. 1.214 kW
a. 63.34 c. 67.37 b. 1.413 kW d. 1.143 kW
b. 65.03 d. 69.57
76. The angle of contact, rad 88. Ratio of the length of action to the base pitch.
a. 3 rad c. 5 rad a. velocity ratio b. contact ratio
b. 4 rad d. 6 rad c. recess ratio d. obliquity ratio
77. The power transmitted, kw
a. 37.45 c. 43.24 89. To avoid brittleness of weld or the residual stress in the
b. 40.80 d. 48.24 welding it normally stress relieved of
78. The load at tight side a. normalizing c. flame hardening
a. 1011.47 lbs c. 1211.47 b. tempering d. annealing
b. 1111.47 d. 1311.47 90. The purpose of these parts in application is to have better
79. The load a t slack side bearings to seal the guard against marning, etc.
a. 559 lbs c. 579 lbs a. bearing journal b. metallic seal
b. 569 lbs d. 589 lbs c. washer d. shaft seal

80. The phenomenon of continuous stretching under load even 91. Addendum of a cycloidal gear tooth is
if the stress is less than the yield point. a. cycloid c. straight rack
a. elasticity b. uctility b. epicycloids d. involute
c. plasticity d. creep
92. A lathe with multiple cutting stations:
a. turnet lathe b. lathe
c. shaper d. none of the above

93. Machine shop instrument for checking the flatness of plane

surfaces to 10ths of thousands of a centimeter.
a. blade type micrometer c. planimeter
b. dial caliper d. micrometer

94. An act of cutting out a piece of metal at a desired shape

and size.
a. broaching b. blanking
c. slitting d. dinking

95. Type of high carbon and alloy used in the production of

precision work tools.
a. chrome manganese c. high-speed
b. titanium d. chrome-molybdenum

96. Design the size of a solid steel shaft to be used for a 500
hp, 250 rpm application if the allowable torsional deflection is 1
deg and the allowable stress is 10,000 psia and modulus of
rigidity is 13 x 106 psi.
a. 5 in c. 4-7/8 in
b. 4-5/8 in d. 4-3/4 in

97. Compute the working strength of 1” bolt which is screwed

up tightly in packed joint when the allowable working stress is
13,000 psi.
a. 3600 psi c. 3950 lbs
b. 3900 lbs d. 3800 lbs

98. Compute the circular pitch (in inches) of a pair of gears

having a speed ratio of 4 and a center distance of 10.23. Each
gear has 27 teeth and pinion has 18 teeth.
a. 0.8095 c. 0.8035
b. 0.7825 d. 0.8085

99. A drop hammer of 1 ton dead weight capacity is propelled

downward by a 12 in diameter cylinder. At 100 psi air pressure,
what is the impact velocity if the stroke is 28 inches?
a. 83.2 fps c. 15.8 fps
b. 31.6 fps d. 47.4 fps

100. A centrifugal pump is directly coupled to a motor. The

pump rating is 3,600 liters per minute against a total head of 8
meters of water. Pump efficiency is 65% at a speed of 550
rpm. Calculate the torsional stress induced on the 40 mm
diameter motor shaft.
a. 11,193.45 kPa c.10,009.12 kPa
b. 13,467.34 kPa d.15,345.67 kPa
1. Calculate the maximum deflection of a 12m beam with fixed 8. Four cylinders rolling in opposite direction has a speed ratio
ends if the load applied on it is 3 KN located at its center. (l = of A,B,C,D=5:3:1:4. If center distance between cylinder A and
4,200,000 mm4, E=200 GPa). C is 70 inches, find diameter of cylinder D,
a. 128.6mm c. 0.17mm A.16.376 in C.26.34 in
b. 32.14mm d. 0.27mm B.12.45 in D.18.75 in

2. A 12cm x 16cm air compressor is operated with maximum 9.It is the outer surface or the pulley is made in convex for to
pressure of 10 kg/cm2. There are 5 bolts with yield strength of keep the belt in center when it is in motion
64 ksi holding the cylinder head to the compressor. Determin A. creep B. crowning
the tensile C. dressing D. slip
a.26.59 MPa b.27.96 MPa
c.28.54 MPa d.32.56 MPa 10.A 2 1/2inches double square thread with two threads/inch is
to be used The frictional radius of the collar is 2 inches and
3.All four compression coil spring support one load of 400 kg. the coefficients of fiction are 0.10 for the threads and 0.15 for
All four springs are arranged in parallel and rated same at the collar. The velocity of the nut is 10 ft/min. for the threads
0.709 kg/mm.Compute defiection in mm and load 4000lbs.Find the efficiency of the screw
a.564 b.1457 A.25.58% C.27.65%
c.171 d.141 B.26.58% D.28.58%

4.What horsepower is required to lift a load of 5000 lbs by a 11.The “tang” of a file is the part that.
cable wrapped around the drum of a hoist the drum being 40in. A.Does the cutting
in diameter and making 24 rpm? B.Fits into the handle
A.28 C.18 C.has no teeth
B.50 D.36 D.is opposite the handle

5.A 1200 mm cast iron pulley is fastened to a 112.5 mm shaft 12.A 19 mmstud bolts used to fastened on a 250 mm diameter
by means of a 28.13 mm square key that is 175 mm long. The cylinder head of diesel engine. If there are 10 stud bolts,
key and the shaft made of SAE 1030 steel, annealed determine the pressure inside the cylinder if bolt stress is 50
(Sy=49ksi, Su=67ksi). What force acting at the pulley will shear Mpa
this key? A.188.8 KPa C.2888 KPa
A16,304 kg b.40,361 kg B.3426 KPa D.4828 KPa
C.61,304 kg d.30,461 kg
13.A 16 mm plate tapped over and secured b y fillet weld on
6.A double threaded worm gear transmits 15hp at 1150rpm. the inside and outside to form a penstock 1.5 m diameter. An
The pitch of the worm is 0.75 inches and pitch diameter of allowable stress of 140mpa on the 14 mm fillet weld he internal
3inches. The pressure angle is 141/2o and the coefficient of pressure that can be carried by the welded joint.
friction is 0.12, Find the worm gear efficiency A.1.38Mpa C. 3.38Mpa\
A.55.13% C.58.34% B. 2.38Mpa D.4.38Mpa
B.50.23% D.60.34%
14.A rectangular key was used in pulley connected to a line
7.A helical compression spring has a scale of 400 lbs/inch, an shaft with a power of 7.46 in a speed of 1200, rpm lf the
inside diameter of 2.5 inches, a free length of 8 inches and shearing stress of then shaft and key are 30 mpa and 240 Mpa
with squared and ground ends, Material is to be chrome , respectively is the length of the rectangular key if the width is
vanadium steel with working stress of 63,000 psi and G = one four that of the shaft diameter
10,800,000 psi. For a load of 825lbs, and for average service. A.3.24 mm C.5.24 mm
Wahls factor, k=1.25, determine the number of active coils. B.4.24mm D.6.24mm
A. 8.23 C.5.34
B.11.23 D.7.81 15.A mechanical press is used to punch 6 holes per minute on
a 25 mm thick plate. The hole in 25mm in diameter and the
plate has an ultimate strength in shear of 420 Mpa. The normal is 7196.60 kg/m. The arms and account 10% of the rim weight
operating speed is 200rpm and it slows down to 180 rpm concentrated at mean diameter. Determine the thickness of the
during the process of punching. The fly wheel has a mean rim.
diameter of one meter and the rim width is 3 times the a. 0.145 cm c. 0.764 cm
thickness. Assume that the hub and is arm account for 5% of b. 0.345 cm d. 0.587 cm
the rim weight concentrated at the mean diameter and density
of cast iron is 7,000 kg per cubic meter. Find the flywheel 21. Big chain sprocket wheels are designed with spokes/arms
weight. are generally elliptical in cross section with major axis _______
A.3.23 KN C.7.38KN times the minor axis.
B.5.39 KN D.9.71KN a. 2 c. 1-1/2
b. 2 ½ d. 3
16.A solid transmission shall 3.5 inches in diameter. It is
desired to replace it with a hollow shaft as much as the same 22. A dumb waiter designed to travel a height of 3m when
torsional strength but its weight should only be half as much as loaded will have a maximum gross weight of 100 kg. A coil
the solid shaft. Find the outside diameter of the shaft spring is provided below to absorb shock in the event that the
A.4.23in C.7.38in dumb waiter should fall freely because of sudden breakage of
B.5.34in D.9.30in the wire rope carrying it. If the coil spring will be deflected to
30.48 cm, if the dumb waiter should accidentally fall and it hit
17. A band brake is installed on at 250 rpm and a diameter of the spring from its maximum height of travel, determine the
900 mm . the angle of contact is 1.5 radians and one end of number of active coils.
the b rake band is fastened to a fixed pin while the other end a. 10.20 c. 16.34
to the brake arm 150 mm from the fixed pin . The coefficient b. 14.23 d.18.34
of friction is 0. 25 and the straight brake arm is 1000 mm a
long and is placed perpendicular to the diameter bisecting the 23. A electric motor running at 1200 rpm drives a punch press
angle of contract Determine the width in millimeters if. The shaft at 200 rpm by means of a 130 mm wide and 8 mm thick
maximum tensile stress is 55Mpa and thickness is 3.0mm belt. When the clutch is engaged the belt slips. To correct this
A.37 C.41mm condition, an idler pulley was installed to increase the angle of
contact but the same belt and pulley were used. The original
18.A single threaded metric thread has a pitch of 4mm and a contact angle on the 200 mm motor pulley is 160 degrees. The
mean diameter of 18mm it is used as a translation screw in original tension ratio is 2.4 and the net tension is 12 N/mm of
conjunction with a collar having an outside diameter of 37 mm the belt width. If the increase in transmission capacity of 20%
and an inside diameter of 27 mm The load is 400 kg and will prevent slippage, determine new angle of contact.
coefficient of friction is 0.3 for both threads and collar. Find the a. 210o c. 230o
total torque b. 220o d. 240o
A.1083 kg-mm C.3321 kg-mm
B.2089kg-mm D.4873kg-mm 24. A double thread ACME thread screw driven by a motor at
400 rpm raises the attached load of 900 kg at a speed of 10
19. The application of electrical current to the corrosion circuit m/min. The screw has a pitch diameter of 36 mm. The
to counter the corrosion reaction is called coefficient of friction on threads is 0.15. The friction torque on
A. cathodic protuction the thrust bearing of the motor is taken as 20% of the total
B. sacrificial anodes method torque input. Determine the motor power required to operate
C. chemical corrosion process the screw.
D. galvanic action a. 1.239 kW c. 3.110 kW
b. 2.239 kW d. 4.239 kW
20. It is found that a shearing machine requires 205 joules of
energy to shear a specific gauge of sheet metal. The mean 25. A helical gear has 30 teeth and a pitch diameter of 280mm.
diameter of the flywheel is to be 76.20. The normal operating Gear module is 8 and pressure angle normal to tooth is 20 o.
speed is 200 rpm, and slows down to 180 rpm during shearing The force normal to the tooth surface is 4500 N. Determine the
process. The rim width is 30.48 cm, and the weight of cast iron kW transmitted at 620 rpm.
 a. 43.49 kW c. 34.94 kW 32. A simple band brake has a 76 cm drum and fitted with a
b. 44.93 kW d. 49.43 kW steel band 2/5 cm thick lined with a brake lining having a
coefficient of friction of 0.25. The arc of contact is 245o. The
26. The smaller of two concentric springs is made of 22 mm drum is attached to 60 cm hoisting drum that sustain a rope
diameter steel spring and has an outside diameter of 100 mm load of 820 kg. The operating force has a moment arm of 1.50
with 10 active coil. The outer spring is made of 32 mm steel m and the band is attached 12 cm from the pivot point. Find
spring and has an outer diameter of 250 mm with 8 active the operating force of the end of brake arm.
coils. Before the load is applied, the outer spring is 25 mm a. 773.80 N c. 777.80 N
longer than the inner spring. If the load of 90 kN is applied to b. 775.80 N d. 779.80 N
the nest of the springs (G=80GPa). Find the spring rate of the
outer spring. 33. A spherical tank has a diameter of 10 m. If the tangential
a. 126.50 kN/m c. 146.50 kN/m stress of the tank is 16 MPa, find the maximum internal
b. 136.50 kN/m d. 156.50 kN/m pressure that the tank can carry if the wall thickness is 25.4
mm.
27. Calculate the factor of safety resulting from the following a. 315.2 kPa b. 264.3 kPa
stress values: yield strength, Sy = 60 ksi; endurance strength, c. 162.6 kPa d. 143.2 kPa
Sn = 20 ksi, average stress, Sm=15 and alternating stress, Sa =
10 ksi. 34. A mechanical press is used to punch 6 holes per minute on
a. 0.92 c. 1.33 a 25 mm thick plate. The hole in 25 mm in diameter and the
b. 2.17 d. 1.11 plate has an ultimate strength in shear of 420 MPa. The
normal operating speed is 200 rpm and it slows down to 180
28. A helical gear having 14 ½ degree normal pressure angle rpm during the process of punching. The fly wheel has a mean
and transverse diametral pitch of 2.3622 per cm, the helix diameter of one meter and the rim width is 3 times the
angle is at 45o and has 8 teeth. Compute the transverse thickness. Assume that the hub and is arm account for 5% of
pressure angle in degrees. the rim weight concentrated at the mean diameter and density
a. 22.2 c.18.9 of cast iron is 7,000 kg per cubic meter. Find the power
b. 19.3 d. 20.1 required to drive the press.
a. 0.833 kW c. 1.56 kW
29. The torsional deflection of SAE 1040 steel is 0.8 o in a b. 1.031 kW d. 2.13 kW
length of ½ m . The shear stress is 69 MPa. Compute the
diameter of the shaft in mm. The modulusof elasticity of steel is 35. A bevel gear speed reducer with 18 teeth on the pinion and
79 GPa. 99 teeth on the gear, both being hardened alloy steel. The
a. 73mm b. 63 mm module is 6 and the width of the face is 58mm. The rating
c. 93 mm d. 83 mm listed is 40 kW at 900 rpm of the pinion. Determine the cone
distance.
30. Compute the speed of the gear mounted on a 52.5 mm a. 202 mm c. 101 mm
diameter shaft receiving power from a 250 hp driving motor. b. 302 mm d. 404 mm
a. 1076 rpm b. 1253 rpm
c. 1563 rpm d. 1852 rpm 36. Compute for the load in KN on a 3 cm diameter 100 cm
long steel rod if its maximum elongation exceeds 0.12.
31. A flange coupling connects two 2” diameter shafts. The a. 178 b. 196
flanges are fitted with 6 bolts of SAE 1040 steel on a 7“ bolt c. 148 d. 287
circle. The shafts runs at 300 rpm and transmit 45 hp. Assume
a factor of safety of 5, ultimate tension of 70,000 psi and 37. A cylindrical tank has an inside diameter of 5 in and is
ultimate shear of 50,000 psi. Determine diameter of the bolt subjected to internal pressure of 500 psi. If maximum stress is
required. 1200 psi, determine the required thickness.
a. 0.228 in c. 0.428 in a. 1.4 in c. 1.0 in
b. 0.328 in d. 0.528 in b. 1.2 in d. 1.6 in
38. A thickness of cylindrical tank is 50 mm. The internal a. 0.159 c. 0.246
diameter is 300 mm and has a internal stress of 8423.58 kPa. b. 0.625 d. 0.189
Determine the maximum internal pressure.
a. 2071.51 kPa b. 2514.76 kPa 47. A lathe machine operation used to produce straight,
c. 3054.19 kPa d. 2358.41 kPa conical, curved a grroved work pieces such as shafts, pins,
handles, and various machine components.
39. The pressure inside the cylindrical tank varies from 800 a. facing b. turning
kPa to 3200 kPa continuously. The diameter of shell is 1.6m. c. knurling d. drilling
Find the wall thickness if yield point is 460 MPa, endurance
strength is 200 MPa and factor of safety of 3. 48. A type of saw which have long, flexible, and continuous
a. 18.34 mm c. 20.45 mm blades and have a continuous cutting action.
b. 24.83 mm d. 28.45 mm a. hack saw b. band saw
c. circular saw d. none of the above
40. A spur gear 20 degrees full- depth involute teeth has an 49. A rail having a coefficient of linear expansion of 11.6 x 10-6
outside diameter of 195 mm and a module of 6.5. Determine m/moC increases its length when heated from 70 oF to 133oF.
the number of teeth. Determine the strain.
a. 20 c. 28 a. 2.04 x 10-4 c. 4.06 x 10-4
b. 25 d. 41 b. 6.05 x 10-4 d. 2.77 x 10-4
41. A standard 20 degrees full-depth spur gear has a 24 teeth
and circular pitch of 0.7854 in. Determine the working depth. 50. A spring has a load of 50 lb with a spring index of 8. If
a. 0.25 in. c. 0.50 in. stress induced is 90,000 psi, determine the wire diameter.
b. 0.45 in. d. 0.60 in. a. 0.058 in c. 0.452 in
b. 0.0828 in d. 0.1157 in
42. A shaft whose torque varies from 2200 to 6400 in-lb. It has
a diameter of 1.25 inches and yield stress of 63,000 psi. Find 51. A shaft revolving at 1740 rpm is supported by a bearing
the variable component stress. with a length of 105 mm and a diameter of 64 mm. If the load
a. 6524.45 psi b. 4245.56 psi is light and SAE Oil No. 20 is used with an average
c. 5475.95 psi d. 7834.56 psi temperature of 65 C and diametral clearance is 0.136 mm,
what would be the loss of power due to friction? Express your
43. A 21 tooth sprocket is connected to a 63 tooth sprocket by answer in kW.
means of RC 60 having 180 inches. Determine the distance A. 0.117 kW c. 0.174 kW
between the sprockets in inches. B. 0.147 kW d. 0.714 kW
a. 51.5 in b. 47.6 in
c. 62.2 in d. 58.4 in 52. A spring sustain 200 ft-lb of energy with deflection of 3 in.
Assume that the main coil diameter is 7 times the wire
44. A 76 mm solid shaft is to be replaced by a hollow shaft of diameter and allowable stress of 100,000 psi, determine the
equal torsional strength. Determine the percent savings in wire diameter.
weight by using hollowshaft. Outside diameter of the hollow a. 0.416 in c. 0.568 in
shaft is 100 mm. b. 0.32 in d. 0.672 in
a. 56.74% b. 55.85%
c. 58.85% d. 53.56% 53. A flanged bolt coupling has ten (10) steel 25.4 mm
diameter bolts evenly tighten around a 415 mm bolt circle.
45. What power should short shaft , 50 mm in diameter, Determine the torque capacity of the connection if the
transmits at 750 rpm? allowable shearing stress in the bolt is 50 Mn/m2.
a. 110 kW b. 100 kW a. 42.3 kN-m b. 52.57 kN-m
c. 80 kW d. 60 kW c. 50 kN-m d. 57.25 kN-m

46. a 20 degrees full-depth gear has tooth thickness of 0.25 in. 54. A concentric helical spring is use to support load of 90 KN.
find the addendum distance. The inner spring has spring rate of 495.8 KN/m and outer
spring is 126.5 KN/m. IF initially the inner spring is 25 mm 61. It is a necessary inter-atomic bond between adjacent
shorter than the other spring, find the percent load carried by molecular dipoles, which may be permanent or induced.
inner spring. a. Van der Waals Bond b. covalent bond
a. 34.65% c. 86.25% c. ionic bond d.none of these
b. 55.86% d. 76.81%
62. The yield strength of a regular yellow brass (65 to 70% Cu,
55.Determine the safe wall thickness of a 30 inches steel tank 30 to 35% Zn) can be increased/improved by:
with internal pressure of 7.82 MPa. The yield stress of material a. tempering c. cold working
is at 275.48 Mpa. The factor of safety to use is 2.0. b. chill casting d. heat treatment
a. 20.6 mm b. 21.6 mm 63. It is a process of butt welding in which the major portion of
c. 22.6 mm c. 23.6 mm the heat required for the welding operation is derived from the
arcing that occurs in the space between the parts to be joined.
56. A band brake is to absorb 5 hp at 200 rpm. The maximum a. tack welding c. ultrasonic welding
pressure of the lining and drum is 120 psi. The width of the b. flash welding d. none of the above
band is 3 inches and the coefficient of friction f=0.15. Find the
maximum band tension. The diameter of the drum is at 8 64. It is the surface damage which results when two surfaces
inches. in contact slight periodic relative motion.
a. 1680 b. 1440 a. corrosion fatigue b. wear
c. 2440 d. 2980 c. fretting d. none of the above

57. Compute the shear modulus of elasticity G of steel whose 65. A bevel gear of the same size mounted on shafts at 90
modulus of elasticity E is 200 GPa and Poisson’s ratio v is degrees
0.30. a. crown gear b. spur gears
a. 23.923 GPa b. 92.763 GPa c. angular gears d. miter gears
c. 76.923 GPa d. 67.923 GPa
66. Which of the following hardness tests measures the
58. A square and ground spring ends spring has a free length hardness of the specimen in relation to the depth of
of 250 mm. There are 10 active coils with the wire diameter of penetration?
12.5mm. If the spring rate is 150 KN/m ad mean diameter is a. Brinell hardness test
100 mm, determine the solid stress. b. Rockwell hardness test
a. 2315.54 MPa b. 7654.80 MPa c. Shore’s scleroscope test
c. 7842.70 MPa d. 8432.90 MPa d. Vickers’s hardness test

59. A solid steel 50mm diameter and 300mm long at 67. SAE steel that responds to heat treatment.
temperature of 25C is firmly secured at each end so that the A. SAE 1060 c. SAE 1030
expansion is fully restricted. Taking the coefficient of linear b. SAE 1117 d. SAE 1020
expansion of steel as 1.2 x 10 -5 C and its modulus of elasticity
as 206 GN/m2. Determine the stress set-up if it is heated to 68. To reduce cost in manufacturing of large worm gears the
150 C. materials to utilize:
a. 390 x 106 N/m2 c. 309 x 106 N/m2 a. alloyed aluminum rim with cast iron spider
b. 410 x 106 N/m2 d. 145 x 106 N/m2 b. bronze rim with cast steel spider
60. A prismatic bar at 500 F is embedded in a rigid concrete c. all of these
wall. The bar is 40 degree long and has a cross sectional area d. cast iron with bronze spider
of 0.4 in2. What is the axial force in the bar if its temperature is
reduced to 100 F? The coefficient of thermal expansion is 5 x 69. ______________ is one in which of the rigid
105 F. members/bodies joined together to form a kinematic chain.
a. 5000 lb b. 8000 lb a. all of these b. link
c. 24,000 lb d. 32,000 lb c. frame d. coplanar
70. A steel pulley with a mean radius of 120 mm is rotated at a A safety valve spring having 9-1/2 coils has the ends
speed of 1100rpm. If the mass of the rim is 5kg, what is the squared and ground. The outside diameter is 115 mm and the
centrifugal force? wire diameter is 13 mm. It has a free length of 203 mm. The
spring must be initially compressed to hold the boiler pressure
a. 7961.5 N b. 9632.5 N
of 1.38 MPa on the valve seat of 32 mm diameter. Modulus of
c. 5231.5 N d. 4265.5 N rigidity is taken as G=80 or 60 GPa. Determine:
81. The force acting on the spring.
71. The differential of the shear equation is which on the a. 0.811 KN or 0.611 c. 1.45 KN
following: b. 1.11 KN d. 1.87 KN or 1.67
a. bending moment of the beam 82. The spring index.
b. tensile strength of the beam a. 6.85 c. 8.85
b. 7.85 d. 9.85
c. tensile strength of the beam
83. The coil deflection
d. load of the beam a. 31 mm c. 35 mm
b. 33 mm d. 45 mm
72. The maximum stress that a member subjected to a 84. The compressed length of spring
completely reversed load can withstand for an infinite number a. 142 mm c. 162 mm
of load applications without failure. b. 152 mm d. 172 mm
a. alternating stress c. endurance limit
85. The length of arc between the two sides of a gear tooth on
b. finite stress d. ultimate stress
the pitch circle.
a. axial plane c. helix angle
73.MALABO b. circular thickness d. chordal angle

An open belt drive connects a 450 mm driving pulley 86. The path of contact in involute gear when force or power is
to another driven pulley 1000 mm in diameter. The belt is 300 actually transmitted. It is a straight imaginary line no passing
mm wide and 0 mm thick. The coefficient of friction of the belt through the pitch and tangent to the base circle.
drive is 0.30 and the mass of the belt is 2.8 kg per meter of belt a. principal reference plane c. pitch point
length. Other data are as follows: b. front angle d. line of action
Center distance bet shafts = 4 m
Maximum allowable tensile stress of belt = 1500 kPa 87. The main bearings of a one cylinder steam engine are 152
Speed of driving pulley = 900 rpm mm diameter and 280 mm long and support a load of 4400 kg.
Determine: The bearings are well ventilated and are heavy in construction.
80. The belt density in lb/in3 The coefficient of friction in bearings is 0.017 and crankshaft
c. 0.014 c. 0.034 rotates at 450 rpm. Bearing diametral clearance is 0.152 mm.
d. 0.024 d. 0.044 Determine the friction loss per bearing.
81. The belt speed in fps a. 1.314 kW c. 1.214 kW
c. 63.34 c. 67.37 b. 1.413 kW d. 1.143 kW
d. 65.03 d. 69.57
82. The angle of contact, rad 88. Ratio of the length of action to the base pitch.
a. 3 rad c. 5 rad a. velocity ratio b. contact ratio
b. 4 rad d. 6 rad c. recess ratio d. obliquity ratio
83. The power transmitted, kw
a. 37.45 c. 43.24 89. To avoid brittleness of weld or the residual stress in the
b. 40.80 d. 48.24 welding it normally stress relieved of
84. The load at tight side a. normalizing c. flame hardening
a. 1011.47 lbs c. 1211.47 b. tempering d. annealing
b. 1111.47 d. 1311.47 90. The purpose of these parts in application is to have better
85. The load a t slack side bearings to seal the guard against marning, etc.
a. 559 lbs c. 579 lbs a. bearing journal b. metallic seal
b. 569 lbs d. 589 lbs c. washer d. shaft seal

80. The phenomenon of continuous stretching under load even 91. Addendum of a cycloidal gear tooth is
if the stress is less than the yield point. a. cycloid c. straight rack
a. elasticity b. uctility b. epicycloids d. involute
c. plasticity d. creep
92. A lathe with multiple cutting stations:
a. turnet lathe b. lathe
c. shaper d. none of the above

93. Machine shop instrument for checking the flatness of plane

surfaces to 10ths of thousands of a centimeter.
a. blade type micrometer c. planimeter
b. dial caliper d. micrometer

94. An act of cutting out a piece of metal at a desired shape

and size.
a. broaching b. blanking
c. slitting d. dinking

95. Type of high carbon and alloy used in the production of

precision work tools.
a. chrome manganese c. high-speed
b. titanium d. chrome-molybdenum

96. Design the size of a solid steel shaft to be used for a 500
hp, 250 rpm application if the allowable torsional deflection is 1
deg and the allowable stress is 10,000 psia and modulus of
rigidity is 13 x 106 psi.
a. 5 in c. 4-7/8 in
b. 4-5/8 in d. 4-3/4 in

97. Compute the working strength of 1” bolt which is screwed

up tightly in packed joint when the allowable working stress is
13,000 psi.
a. 3600 psi c. 3950 lbs
b. 3900 lbs d. 3800 lbs

98. Compute the circular pitch (in inches) of a pair of gears

having a speed ratio of 4 and a center distance of 10.23. Each
gear has 27 teeth and pinion has 18 teeth.
a. 0.8095 c. 0.8035
b. 0.7825 d. 0.8085

99. A drop hammer of 1 ton dead weight capacity is propelled

downward by a 12 in diameter cylinder. At 100 psi air pressure,
what is the impact velocity if the stroke is 28 inches?
a. 83.2 fps c. 15.8 fps
b. 31.6 fps d. 47.4 fps

100. A centrifugal pump is directly coupled to a motor. The

pump rating is 3,600 liters per minute against a total head of 8
meters of water. Pump efficiency is 65% at a speed of 550
rpm. Calculate the torsional stress induced on the 40 mm
diameter motor shaft.
a. 11,193.45 kPa c.10,009.12 kPa
b. 13,467.34 kPa d.15,345.67 kPa