MDSP PRE-EXAMINATION

1. The engineering stress in a solid tension member was 324 MPa at a failure.
The reduction in area was 80%. What was the true strain at failure?
A. 1.61
B. 1.16
C. 1.24
D. 1.42

2. A hoist with 170-horsepower engine is capable of lifting a 20,000 lb load a

height of 20 ft in 10 seconds. What is the efficiency of this machine?
A. 27.15%
B. 36.40%
C. 30.70%
D. 42.78%

3. A slab-milling operation is being carried out a 12-in long, 4-in wide

annealed mild-steel block at a feed 0.01 in/tooth and a depth of cut 1/4 in.
The cutter is 2 inches in diameter, has 20 straight teeth, rotates at 100
rpm, and is wider that the block to be machined. Calculate the power
requirement considering that the work piece is annealed mild steel with
specific energy of 1.1 hp-min/cu.in.
A. 20 hp
C. 44 hp
B. 22 hp
D. 25 hp

4. A 4-mm fillet weld 50 mm long carries a steady load P lying along the weld.
IF the working stress in shear is taken as 78 Mpa. Calculate the load it can
carry.
A. 18 kN
B. 11 kN
C. 15 kN
D. 20 kN

5. A 250 hp motor runs a shaft at 2400 rpm. The shaft steps down in diameter
from 3.0 to 2.5 inches. Calculate the maximum torsional shear stress if the
stress concentration factor is given to be 1.3.
A. 19.2 Mpa
B. 22.5 Mpa
C. 17.3 Mpa
D. 28.00 Mpa

6. A steel cylindrical pressure vessel is subjected to a pressure of 3.1 ksi.

Its diameter is 185 inches and its wall thickness is 8 in. What is the
maximum principal stress in this vessel?
A. 43.5 ksi
B. 25.7 ksi
C. 32.7 ksi
D. 12.5 ksi

7. How many kilograms in one pound?

A. 9.81
MDSP PRE-EXAMINATION
B. 2.205
C. 0.4536
D. 4.448

8. A beam is 2 in wide and 3 inch deep is subjected to 40,000 in-lb bending

moment at each end. Find the value of the bending stress.
A. 92 Mpa
B. 32 Mpa
C. 45 Mpa
D. 100 Mpa

9. How much will a steel bar be elongated by a load of 15 kips if the bar is 10
ft in length and has a cross-sectional area of ½ square inch?
A. 0.12 ft
B. 0.45 inch
C. 3.04 mm
D. 2.04 cm

10. A steel bandsaw blade is 0.032-in thick. Find the value of the bending
stress when the blade is passing around a pulley of 20-in. diameter.
A. 104 ksi
B. 48 ksi
C. 57 ksi
D. 96 ksi

11. What is the outside diameter of a hollow shaft replacing a 150 mm diameter
solid shaft with equal torsional strength and 50% weight saved?
A. 180 mm
B. 190 mm
C. 160 mm
D. 170 mm

12. A power screw is being turned at constant rpm by the application of a

steady torque of 300 inch-pounds. How much work is being expended per
revolution?
A. 942 ft-lb
B. 39.25 ft-lb
C. 157 ft-lb
D. 34.45 ft-lb

13. A draft horse walks at the rate of 5 km/hr. What uniform force in newton
must he exert if the output power is exactly two kilowatt?
A. 1.44 kN
B. 3.4 kN
C. 0.720 kN
D. 720 kN

14. A 10 inch diameter pulley is belt driven with a net torque of 250 ft-lbs.
The ratio of tensions in the tight to slack sides of the belt is 4 to 1.
What is the maximum tension in the belt?
A. 350 lbs
B. 400 lbs
C. 200 lbs
MDSP PRE-EXAMINATION
D. 800 lbs

15. If a 650 mm diameter, steel flywheel of constant thickness is used, how

thick should it be? The specific gravity of steel is 7.85. The inertia of
flywheel is 18.31 kg-m(squared).
A. 3.54 in.
B. 5.24 in.
C. 13.33 in.
D. 1.45 in.

16. Which of the following is a single crystal grown by vapor deposition?

A. Glass
B. Roving
C. Ceramics
D. Whisker

17. A 25 in. long cantilever spring is composed of 8 graduated leaves and one
extra full length leaf. The leaves are 1 ¾ in wide. A load of 350 lb at the
end of the spring causes a deflection of 2 inches. Determine the thickness
of the leaves.
A. 0.4362 in.
B. 0.6352 in.
C. 0.2356 in.
D. 0.3204 in.

18. Determine the torque that can be applied to a 1-in diameter circular shaft
if the shearing stress is not to exceed 8000 psi.
A. 1570 in-lb
B. 1340 in-lb
C. 1579 in-lb
D. 1450 in-lb

19. For a 4-bar linkage in toggle position, the value of mechanical advantage
is .
A. infinity
B. 0.5
C. 1
D. 0

20. A clutch system is going to transmit 40 hp between two shafts. One of the
shafts is not rotating at the time of coupling. The speed of the rotating
shafts is 1000 rpm. The clutch diameters of the disk are 2 inches and 8
inches. The total mass moment of inertia of the system is 20 lb-in-
s(square). Find the axial force for successful coupling based on uniform
pressure. The friction coefficient between linings is 0.30.
A. 4000 lb
B. 3540 lb
C. 3000 lb
D. 2643 lb

21. A heavy-duty sleeve bearing is used with good ventilation. The bearing has
a diameter of 2 in and a length of 4in. The load on the bearing is 1100 lb.
MDSP PRE-EXAMINATION
A shaft rotates 200 rpm in the bearing. Find the heat radiating capacity.
The coefficient of friction is 0.02.
A. 0.4342 Btu/min-sq.in
B. 0.4920 Btu/min-sq.in
C. 0.3702 Btu/min-sq.in
D. 0.3892 Btu/min-sq.in

22. A pair of mating spur gears have 14 ½ deg. Full depth involute teeth of 2
½ diametral pitch. The pitch diameter of the smaller gear is 6.4 inches. If
the transmission ratio is 3 to 2. Calculate the dedendum.
A. 0.462 in.
B. 0.8762 in.
C. 0.0628 in.
D. 0.4 in.

23. Mechanical impact devices that accept material smaller than approximately
4 inches.
A. Agitator ball mills
B. Mechanical impact mills
C. Fine impact mills
D. Ring roller mills

24. A design requirement for a pogo stick is a spring that will compress 18 cm
when 100-kg person drops one meter. What is the required spring constant?
A. 75.2 kN/m
B. 71.4 kN/m
C. 65.7 kN/m
D. 68.8 kN/m

25. What is the maximum allowable length between supports for a 2.5 inches
diameter shaft that has no bending load except its own weight?
A. 12.14 ft
B. 14.2 ft
C. 38.63 in.
D. 42.78 in.

26. A 1000 lbs flywheel has a torque capacity of 2600 ft lb. The speed is to
be maintained between 100 and 120 rpm. The effect of the arms and hub
accounts for 10% of the rim weight. Find the mean diameter of the flywheel.
A. 35.36 in
B. 44.65 in
C. 38.63 in
D. 42.78 in

27. If a driving pulley is 0.75 ft. in diameter and drives a 12-in diameter
pulley, find the speed (no slip condition) of the driven pulley if the
driver rotates at 200 rpm.
A. 104 rpm
B. 150 rpm
C. 96 rpm
D. 100 rpm
MDSP PRE-EXAMINATION
28. A short cylindrical cast iron post supports a compressive load of 20 tons.
Compute the diameter of the post if the factor of safety is 10 and the
compressive stress as given in the table is 80 ksi.
A. 6.41 cm
B. 2.52 cm
C. 25.2 mm
D. 6.41 in.

29. A square-threaded transmission screw used in the jack has a root diameter
of 2 inches and a pitch of ¼ in. It is double-threaded and designed to lift
a load of 10 tons. The coefficient of friction is assumed to be 0.15. Find
the efficiency of the screw.
A. 20 %
B. 15 %
C. 40 %
D. 12 %

30. A 20 in. long cantilever spring is composed of 8 graduated leaves and one
extra full length leaf. The leaves are 1 3/4 in wide. A load of 500 lb at
the end of the spring causes a deflection of 3 inches. Determine the
thickness of the leaves.
A. 0.1354 in.
B. 0.2522 in.
C. 0.2650 in.
D. 0.1446 in.

31. A solid circular steel column with hinged ends is 900-mm long 70 mm. in
diameter. Yield point stress of material is 350 Mpa. Find the moment of
inertia of the solid circular steel column.
A. 118 cm(raised to 4)
B. 100 cm(raised to 4)
C. 72 cm(raised to 4)
D. 59 cm(raised to 4)

32. A torsion member is made of steel 6-in. in diameter. To save mass it is

proposed to replace it with a hollow bar of the same type of steel with a 4-
in. diameter hole through its center. What should be diameter of the hollow
bar to be provided the same torsional stiffness?
A. 3.14 in.
B. 7.22 in.
C. 6.28 in
D. 5.65 in

33. The pin diameter for a sleeve-type coupling is 0.20 in. and transmitted a
torque equal to 400 in-lb. Find the working stress in shear for the pin
assuming that the shaft diameter is 1 in.
A. 12,750 psi
B. 14,500 psi
C. 10,450 psi
D. 11,350 psi
MDSP PRE-EXAMINATION
34. A pump with a mass of 40 kg is supported by four springs, each having
spring constant of 1750 N/m. The motor is constrained to allow only vertical
movement. What is the natural frequency of the pump?
A. 13 rad/s
B. 6 rad/s
C. 9 rad/s
D. 15 rad/s

35. A 40-tooth steel gear has a diametral pitch of 2. The pressure angle is
14 ½ degrees. Find the circular pitch.
A. 0.50
B. 1.5 pi
C. 1.571
D. 0.579

36. The cutting speed for turning a 4-inch diameter bar has been found to be
545 fpm. Calculate the lathe spindle speed?
A. 549 rpm
B. 600 rpm
C. 520 rpm
D. 750 rpm

37. Which of the following occurs whenever is a discontinuity or non-

uniformity in an object?
A. Stress concentration factor
B. Extreme shear stress
C. Geometric stress concentration
D. Fatigue stress concentration

38. The 4 metric ton hammer of a pile driver is lifted 1 meter in 2 seconds.
What power does the engine furnish the hammer?
A. 26.3 hp
B. 14.56 hp
C. 1962 hp
D. 52.6 hp

39. An interrupted quenching process resulting in an austenite to bainite

transition is .
A. Martempering
B. Austempering
C. Austenitizing
D. Normalizing

40. Find the horsepower lost due to friction in a flat-pivot application,

assuming the following conditions: coefficient of friction is 0.15, shaft
diameter is 1.25 inch, the axial force of 50 lbs and the rotational speed in
400 rpm.
A. 0.0289 hp
B. 0.0305 hp
C. 0.0198 hp
D. 0.0297 hp

41. A hard material .

MDSP PRE-EXAMINATION
A. Yields little before breaking
B. shows high ultimate strength
C. shows low ultimate strength
D. exhibits a high modulus of elasticity

42. A flywheel weighing 4,480 lbs has a radius of gyration of 3 feet. If there
is a driving torque of 600 ft-lb and a resisting torque of 250 ft-lbf, find
the time required to increase the speed from 20 to 80 revolution per minute.
A. 22.5 s
B. 20.5 s
C. 15.4 s
D. 12.5 s

43. A 20 in. long cantilever spring is composed of 8 graduated leaves and one
extra full length leaf. The leaves are 1 3/4 in wide. A load of 500 lb at
the end of the spring causes a deflection of 3 inches. Determine the maximum
bending stress in the full length leaf assuming that the first extra full
length leaf been pre-stressed to give the same stress in all leaves.
A. 80,100 psi
B. 40,000 psi
C. 60,000 psi
D. 70,990 psi

44. A double threaded right hand 3.0 in worm gear transmit 20 hp at 1,550 rpm.
The pressure angle is 14.5 deg. and the coefficient of friction is 0.12.
Find the tangential force on the gear in lbs.
A. 548 lbs
B. 730.43 lbs
C. 821.74 lbs
D. 620 lbs

45. A helical-coil spring has a mean diameter of 1 inch and a wire diameter of
1/8 in. If the shearing stress is 60,000 psi, how many coils would be needed
to restrict the deflection to 1 inch under that load if the shear modulus of
elasticity is 12.5 x 10(raised to 6)?
A. 12
B. 14
C. 15
D. 10

46. Which of the following is one of the best methods for increasing a
spring's fatigue life?
A. Stress relieving
B. Shotpeening
C. Tempering
D. Hardening

47. A simply supported steel beam length L = 18 in. and diameter of 1 in. is
transversely loaded at its midpoint, Calculate the alternating stress
component at the midpoint of this beam in psi if a constant bending load of
2000 lb. is applied, but its location continuously changes from the midpoint
of the beam to about one third of its length based on the left end of the
beam, for each cycle of load variation.
MDSP PRE-EXAMINATION
A. 21705.40 psi
B. 52034.22 psi
C. 37581.67 PSI
D. 15279.03 psi

48. A 100-ton hydraulic jack has an 8-in diameter piston and a cylinder
thickness of t. Find the appropriate wall thickness if the cylinder is
fabricated from high-strength steel having a permissible working stress of
40,000 psi in tension.
A. 0.54 in
B. 0.30 in
C. 0.40 in
D. 0.36 in

49. A 2000-kg elevator rises from rest in the basement to the fourth floor, a
distance of 25 m. As it passes the fourth floor, its speed is 3 m/s There is
a constant frictional force of 500 N. Calculate the work done by the lifting
mechanism,
A. 125 kJ
B. 500 kJ
C. 512 kJ
D. 487 kJ

50. A clutch system is going to transmit 40 hp between two shafts. One of the
shafts is not rotating at the time of coupling. The speed of the rotating
shaft is 1000 rpm. The clutch diameters of disk are 2 inches and 8 inches.
The total mass moment of inertia of the system is 20 lb-in-s(square). Find
the time needed to stop the slippage. The friction coefficient between
linings is 0.30.
A. 0.75
B. 0.92
C. 0.45 s
D. 0.83 s

51. The distortion energy theory is also known as

A. Coulomb - Mohr Theory
B. Maximum Shear Stress Theory
C. Maximum Normal Stress Theory
D. Von Mises Theory.

52. The allowable tensile Stress for a 6.25 mm diameter bolt with a thread
length of 5.5 mm is 207 Mpa. The allowable shear stress of the material is
103 Mpa. Where and how will such a bolt be most likely to fail if placed in
tension? (Assume threads are perfectly triangular and that the force is
carried at the mean thread height.)
A. at the root diameter diameter due to shear
B. at the threads due to shear
C. at the threads due to tension
D. at the root diameter due to tension

53. A ½ -in fillet weld 2 in long carries a steady load of 3,000 lb lying
along the weld. The weld metal has a yield strength of 50, 000 psi. Find the
value of the factor or safety.
MDSP PRE-EXAMINATION
A. 1.75
B. 2.95
C. 1.45
D. 3.2

54. A C-section belt 87.9 inches long operates on pulley of pitch diameter 12
in and 16 inch. Speed of smaller pulley is 1,160 rpm. Horsepower Is 9 but a
service factor of 1.6 must be used. What is the design horsepower?
A. 15 hp
B. 9 hp
C. 14.4 hp
D. 5.625 hp

55. A plate clutch with a single friction surface is 10 inches O.D. and 4
inches I.D. If the uniform wear Is valid, find the torque for maximum
pressure of 100 psi. (Friction Coef. = 0.2)
A. 3249 in-lbf
B. 2344 in-lbf
C. 3124 in-lbf
D. 2639 in-lbf

56. A spring has a natural length of 12 inches When at rest. If force 10 lbs
is required to stretch it 1 inch, find the work required to stretch the
spring from a total length of 13 inches to 15 inches?
A. 6.667 N-m
B. 3.33 N-m
C. 4.52 N-m
D. 23.333 N-m

57. A steel bandsaw blade is 0.85 mm thick. Find the value of the bending
stress when the blade is passing around a pulley of 520 mm diameter. Note: E
= 206,900 Mpa
A. 240.5 MPa
B. 321.8 Mpa
C. 250.5 Mpa
D. 338.2 Mpa

58. Which type of gears are used for shaft axes having an offset?
A. Hypoid gear
B. Spiral Bevel gear
C. Zerol gear
D. Mitre gear

59. A pair of mating spur gears have 14 ½ deg. Full depth involute teeth of 2
diametral pitch. The pitch diameter of the smaller gear is 6.4 inches. If
the transmission ratio 3 to 2. Calculate the addendum.
A. 0.462 in.
B. 0.862 in.
C. 0.4 in.
D. 0.57 in.

60. A grindstone has a moment of inertia of 1.6 x 10 kg.m (squared). When a

constant torque is applied, the flywheel reaches an angular velocity of 1200
MDSP PRE-EXAMINATION
rpm in 15 seconds. Assuming it started from rest, find its angular
acceleration in rad/s(squared)?
A. 8.38
B. 3.24
C. 6.42
D. 7.48

61. Surface hardening is desirable for a product that subject to .

A. fatigue
B. high impact loads
C. high shear loads
D. high tensile loads

62. A 1 3/4 in. diameter shaft is supported by two sleeve bearings. The total
load on the two bearings is 2800 lb. Find the horsepower lost in friction if
the coefficient of friction between sha t and bearing is 0.10 and the shaft
rotates 200 rpm?
A. 0.58 kW
B. 0.29 kW
C. 0.14 kW
D. 0.38 kW

63. What is the space width of the gear if the tooth thickness is 0.20 in and
the backlash is 0.005 in?
A. 0.001 in
B. 0.195 in
C. 0.205 in
D. 0.250 in

64. The shearing stress in a piece of structural steel s 14.51 ksi. If the
modulus of rigidity G is 85 Gpa, find the shearing strain.
A. 0.00231
B. 0.00542
C. 0.00117
D. 0.850

65. How long in minutes will it take to saw a rectangular piece of aluminum
plate 8 inches wide and 1.5 inches thick if the length of the cut is 8
inches? The power hacksaw makes 2.5 revolutions per second and the average
feed per stroke is 0.006 inch.
A. 9.78 min
B. 8.89 min
C. 10.78 min
D. 5.29 min

66. A 250 hp motor turns a shaft at 2400 rpm. The shaft steps down in diameter
from 3.0 to 2.5 inches. calculate the maximum torsional shear stress if the
stress concentration factor is given to be 1.3.
A. 2100 psi
B. 3700 psi
C. 2800 psi
D. 1700 psi
MDSP PRE-EXAMINATION
67. If the inertia is 90 lbm-sq. ft. and the speed of he driven shaft is to be
increased from 0 to 2500 rpm in 5 seconds, find the clutch starting torque.
Shaft material is SAE 4140 with a shear yield strength of 110 ksi.
A. 512.18 lb-ft .
B. 146.47 lb-ft.
C. 416.74 lb-ft
D. 261.25 lb-ft

68. A simple epicyllc gearbox with one planet has gears with 24, 40 and 104
teeth on the sun, planet and internal ring gears respectively. The sun
rotates clockwise et 50 rpm. 'The ring gear is fixed. What is the rotational
velocity of the planet carrier?
A. 12.16 rpm
B. 8.49 rpm
C. 11.54 rpm
D. 9.38 rpm

69. A jackscrew has a pitch of 3 mm and handle 600 m long. A force of 60 N

must be applied when a load of 25 kN is being lifted. Calculate the Ideal
Mechanical Advantage.
A. 1257
B. 2.4
C. 0.33
D. 416.67

70. A hoist Lifts a load a height of 8 m in a time of 20 s. Compute the power

output.
A. 11.8 hp
B. 10.58 hp
C. 12.43 hp
D. 15.78 hp

71. Which of the following is the ratio of the fatigue strength without a
stress concentration to the fatigue stress with a stress concentration?
A. Wahl factor
B. Fatigue stress concentration factor
C. Reliability factor
D. Factor of safety

72. A multiple-disc clutch consists of 10 steel discs a d 9 bronze discs. The

effective outside and inside diameters are 8 inches and 6 inches
respectively. If an axial force 100 1b is applied and the shaft turns at
1000 rpm, find the horsepower capacity. Assume the coefficient of friction
of 0.25 and uniform pressure.
A. 32.5 hp
B. 25.2 hp
C. 43.7 hp
D. 15.7 hp

73. A 1.00 m cast iron wheel has a 1.00 mm thick steel ring into it as a tire.
The interference fit is 1.0 mm. What is the contact pressure?
A. 42 kPa
MDSP PRE-EXAMINATION
B. 12 kPa
C. 32 Mpa
D. 21 Mpa

74. Fixing both ends of a simply supported beam that has only concentrated
load at the midspan will increase the allowable load by .
A. 200%
B. 25%
C. 100%
D. 50%

75. What is the most suitable material in a TIG welding process?

A. Aluminium
B. Plain steels
C. Alloy steels
D. Copper

76. A slab-milling operation is being carried out on a 12-in long, 4-in wide
annealed mild-steel block at a feed 0.01 in/ tooth and a depth of cut 1/6
in. The cutter is 2 inches diameter, has 20 straight teeth, rotates at 100
rpm, and is wider that the block to be machined. Calculate material removal
rate.
A. 13 cu. in/min
B. 10 cu. in/min
C. 25 cu. in/min
D. 40 cu. in/min

77. What is the diameter of the solid shaft when it is coupled by 7 bolts 1.25
inches in diameter with centers 6 inches from the axle?
A. 8 in
B. 7 in
C. 6 in
D. 9 in

78. A flywheel has a diameter of 1.5 m, and a mass of 800 kg. Calculate the
torque needed to produce an angular acceleration of 100 rpm, per second?
A. 225 J
B. 3456 J
C. 3212 J
D. 2536 J

79. Spring back metal forming depends on .

A. none of these
B. strain rate
C. modulus of elasticity
D. load applied

80. A simple disc clutch has elements with outside and inside radii of 250 mm
and 100 mm respectively. The axial force is 1500 N. If the coefficient of
friction is 0.3, find the torque capacity based on uniform wear.
A. 79 N-m
B. 72 N-m
C. 77 N-m
MDSP PRE-EXAMINATION
D. 75 N-m

81. Commercial propane stored in spherical steel tank at 100 °F generates a

gage pressure of 160 psi. If the tank is 4 feet in diameter and has walls
0.25 inch thick, what maximum tensile stress in psi is developed in the
steel?
A. 13,000 psi
B. 1,700 psi
C. 7,700 psi
D. 2,900 psi

82. During a stress-strain test, since the given stresses are below the
proportional limit, the unit deformation at a stress of 35 MPa was observed
to be 123 x 10 to the minus 6 m/m and a stress of 135 MPa, it was 321 x 10
to the minus 6 m/m. If the proportional limit was 150 MPa, compute for the
strain in in/ in corresponding to the stress of 100 000 kPa. Express your
answer in three significant digits.
A. 2.68 x 10 to the minus 4 in/ in
B. 3.18 x 10 to the minus 4 in/ in
C. 4.67 x 10 to the minus 4 in/ in
D. 1.89 x 10 to the minus 4 in/ in

83. What is the result when mers join with a high degree of regularity in
chain structure and mer orientation?
A. Isotactic polymer
B. Trans mer
C. Syndiotactic polymer
D. Atactic polymer

84. The center of a wheel with an outer: diameter of 610 mm is moving at 12.5
m/ s. There is no slippage between the wheel and the surface. A valve stem
is mounted 150 mm from the center. What is the velocity of the valve stem
when it is 45 degrees from the horizontal?
A. 12.5 m/s
B. 17.4 m/s
C. 20.62 m/s
D. 40.98 m/s

85. A 0.25 in diameter steel support wire normally strung between two utility
poles 125 ft apart under 1500 lbf of tension. A winch maintains the tension
by stretching the wire. A new procedure requires 4250 lbf of tension.
Calculate the length of additional wire the winch must decrease to reach the
new tension.
A. 6.8 cm
B. 8.15 cm
C. 7.11 cm
D. 5.12 cm

86. What is the bursting speed for a cast iron flywheel having a tensile
strength of 20,000 psi?
A. 456.22 ft/s
B. 444.21 ft/s
C. 546 ft./s
MDSP PRE-EXAMINATION
D. 436 ft/s

87. When a column is subjected to an eccentric load, the stress induced in the
column will be .
A. both direct and bending stress
B. shearing stress only
C. bending stress only
D. direct stress only

88. Determine the maximum permissible velocity V in a cast iron rim of a

flywheel the maximum allowable tensile stress in cast iron is 4000 psi. The
cast iron weighs 0.255 lb/cu in.
A. 54.5 m/s
B. 205 m/s
C. 62.5 m/s
D. 125 m/s

89. A 1/4 inch cone pointed setscrew Is spotted one-half of the length of the
cone. The cone angle is 118 degrees and the allowable shearing stress of the
setscrew material is 10,000 psi. Find the holding power of the setscrew when
it is securing a pulley to a 1/2 inch shaft.
A. 490.87 lbs
B. 245.44 lbs
C. 1963.50 lbs
D. 122.72 lbs

90. Find the pressure required to punch a 1-inch square hole in ½ -in thick
steel?
A. 20 tons
B. 16.25 tons
C. 20.125 tons
D. 26.67 tons

91. A rivet is made of medium steel and is 3/4 inch in diameter, what total
safe resistance can it offer with a factor of safety of 8 and the ultimate
shearing stress is 50 ksi?
A. 2 tons
B. 5604 lbf
C. 12.3 kN
D. 2760 kgf

92. A 6-mm fillet weld 50 m long carries a steady load of 13,000 N lying along
the weld. The weld metal has a yield strength of 360 Mpa. Find the value of
the factor or safety.
A. 2.94
B. 3.2
C. 1.75
D. 1.45

93. The diameter of a solid shaft that rotates 100 rpm and transmits 1.2 hp is
7/8 inch. Calculate the design stress (for shear) if the shaft is subjected
to torsion only.
A. 7000 psi
MDSP PRE-EXAMINATION
B. 6000 psi
C. 5000 psi
D. 5000 psi

94. A slab-milling operation is being carried out on 12-in long, 4-in wide
annealed mild-steel block at a feed 0.01 in/ tooth and a depth of cut 1/8
in. The cutter is 2 inches in diameter, has 20 straight teeth, rotates at
100 rpm, and is wider that the block to be machined. Calculate the linear
speed of the work piece.
A. 50 in/min
B. 40 in/min
C. 25 in/min
D. 20 in/min

95. If a car wheel is 60 cm diameter and a rim Is 0.90 mm smaller ID, to what
temperature would it be necessary to heat the rim to provide a 0.100 mm
clearance to assemble the rim on the wheel? Both members are made of steel.
Dry Ice at negative 79 deg C is available to cool the wheel. Ambient
temperature is 20 deg. C.
A. 45.6 deg.C
B. 43.4 deg. C
C. 32.5 deg.C
D. 63.4 deg. C

96. A flywheel weighing 4,480 lbs has a radius of gyration of 3 feet. If there
is a, driving torque of 600 ft-lb and a resisting torque of 250 ft-lbf, find
the moment of inertia if the speed increases from 20 to 80 revolutions per
minute.
A. 1252 ft-lb-s²
B. 1055 ft-lb-s²
C. 1526 ft-lb-s²
D. 1800 ft-lb-s²

97. The transverse fillet welded' joints are designed for .

A. shear strength
B. bending strength
C. tensile strength
D. compressive strength

98. How many elevators are required if there are 1320 persons occupying
building other than the first floor?
A. 7
B. 8
C. 6
D. 5

99. A coil spring 4 cm in outside diameter made of 5 mm wire is to support a

mass of 45 kg, find the number of coils if it deflects 60 mm under the given
load condition. Modulus of rigidity for steel is 83 Gpa.
A. 21
B. 18
C. 19
MDSP PRE-EXAMINATION
100. An eyebolt support is attached to a rigid steel beam. A very stiff
compression spring is used to preload the eyebolt. The spring is loaded by
means of a nut screwed down on the end of the eyebolt until it exerts a
force of 5000 N. What would be the force exerted on the shank of the bolt If
a mass of 800 kg were attached to the eyebolt.
A. 5 kN
B. 6.4 kN
C. 7.85 kN
D. 2.85 kN