MD ELEMENTS 16

1. For ordinary steel, the modulus of elasticity usually falls between __ million pounds.
   A. 20 to 30
   B. 35 to 45
   C. 20 to 35
   D. 25 to 30

A. 20 to 30

2. The modulus of elastic for metals in compression is usually taken as that in:
   A. Tension
   B. Bearing
   C. Yield
   D. ultimate

C. Yield

3. Which of the following is the ratio of moment and stress?
   A. Strain
   B. section modulus
   C. contraction
   D. passions ratio

B. section modulus

4. What is the flexural stress when of a symmetrically cross-section beam when the vertical shear is maximum?
   A. Infinity
   B. Zero
   C. maximum
   D. minimum

B. Zero

5. The riveted joint in ASME Code has as design surface compressive stress __ higher than the design tensile stress.
   A. 70%
   B. 60%
   C. 35%
   D. 50%

B. 60%

6. What is the ratio of the minimum strength of joint to the strength of solid joint in the pressure vessel?
   A. Efficiency
   B. relative strength
   C. performance factor
   D. Joint Efficiency

B. relative strength

7. What is the usual factor of safety for a pressure
   vessel?
   A. 4
   B. 1.5
   C. 3
   D. 5

D. 5

8. It is the permissible variation of the size.
   A. Tolerance
   B. Limit
   C. fits
   D. none of these

A. Tolerance

9. Considering that there is no fit, what is the
   permissible liberal tolerance in machining
   work?
   A. $\pm 0.010$
   B. $\pm 0.090$
   C. $\pm 0.020$
   D. $\pm 0.050$

A. $\pm 0.010$

10. Which of the following is the tolerance where
    the size of a part may be larger or smaller
    only, than the given dimension?
    A. Unilateral
    B. Lateral
    C. Bilateral
    D. none of these

A. Unilateral

11. A tolerance where the size of the part is
    permitted to be either larger or smaller than
    the given dimension.
    A. Unilateral
    B. Lateral
    C. Bilateral
    D. none of these

C. Bilateral

12. Which of the following is the basis for ASA
    fits?
    A. Basic number system
    B. basic hole system
    C. basic size system
    D. unit system

B. basic hole system

13. When the hole is smaller than the shaft, it will take force or pressure to put the cold parts
    together. In such case the allowance is
    negative. Which of the following terms is
    appropriate for such allowance?5
    A. Negative fits of metal6
    B. Interference of metal7
    C. positive fits of the metal
    D. Intangible fits

B. Interference of metal

14. What is the direction of the predominant
    surface pattern?
    A. Smoothness
    B. Waviness
    C. lay
    D. roughness

C. lay

15. It is the irregularities of departures from the
    nominal surface of greater spacing than
    roughness?
    A. Waviness
    B. roughness
    C. lay
    D. smoothness

A. Waviness

16. It is the surface finish of micrometer in rms.
    A. 1
    B. 2
    C. 3
    D. 4

A. 1

17. Which of the following gears has the simplest
    type of teeth?
    A. Helical gears
    B. Spur gears
    C. bevel gears
    D. worm gears

B. Spur gears

18. In gears, an imaginary circle on which the lever
    arm is based in;
    A. Base circle
    B. pitch circle
    C. addendum circle
    D. clearance circle

B. pitch circle

19. It is the circle tangent to the addendum of the
    meshing gears.
    A. Clearance circle
    B. base circle
    C. Addendum circle
    D. pitch circle

A. Clearance circle

20. The distance from a point on one gear to the
    corresponding point measured along the base
    circle.
    A. Normal pitch
    B. circular pitch
    C. axial pitch
    D. diametral pitch

A. Normal pitch

21. A line passing through the pitch point that is
    tangent to both base circles of a gear is:
    A. Pressure line
    B. Perpendicular line
    C. Tangent line
    D. Center line

A. Pressure line

22. Which of the following is the contact ratio for a good gear design?
    A. 1.5:1
    B. 1.1:3
    C. 1:3
    D. 1.2:2

A. 1.5:1

23. In pressure vessels, which of the following resists internal pressure through tension?
    A. Shell type element
    B. cam type element
    C. plate-type element
    D. spherical type element

A. Shell type element

24. It is the study of the body’s motion independent of the forces on the body.
    A. Kinetics
    B. Dynamics
    C. Kinematics
    D. mechanics

C. Kinematics

25. What is the reciprocal of the velocity ratio?
    A. Train value
    B. Ratio factor
    C. modular value
    D. none of these

A. Train value

26. It is a type of bolt finished all over and has usually having coarse threads.
    A. Coupling bolt
    B. stud bolt
    C. machine bolt
    D. automobile bolt

A. Coupling bolt

27. It is a type of bolt distinguishes by a short portion of the shank underneath the head being square or finned or ribbed.
    A. Coupling bolt
    B. stud bolt
    C. machine bolt
    D. carriage bolt

D. carriage bolt

28. It is a type of bolt threaded on both ends and can be used where a through bolt impossible.
    A. Coupling bolt
    B. carriage bolt
    C. stud bolt
    D. machine bolt

C. stud bolt

29. Which of the following is not a type of bolt?
    A. stub bolt
    B. Steel bolt
    C. machine bolt
    D. coupling bolt

B. Steel bolt

30. It is a locking device that is used to maintain pressure between threads of the bolt and nut.
    A. Gasket
    B. lock washer
    C. lock nut
    D. filler

B. lock washer

31. What is the large wood screw used to fasten machinery and equipment.
    A. Lag screw
    B. loss screw
    C. wood screw
    D. cross screw

A. Lag screw

32. What is the minimum length of contact in a tapped hole for cast iron?
    A. 1.7D
    B. 1.5D
    C. 1.2D
    D. 2.1D

B. 1.5D

33. It is the ratio of the mean diameter of coil over the coil diameters.
    A. Wahl factor
    B. spring index
    C. coil ratio
    D. lead scale

B. spring index

34. What is the overall length of springs when it is compressed until all adjacent coils touched?
    A. Free length
    B. solid length
    C. compressed length
    D. expansion length

B. solid length

35. It is the length of a coil spring under no load?
    A. Compressed length
    B. free length
    C. solid height
    D. none of these

B. free length

36. In general, these steels springs are made of high quality of relative high carbon steel usually;
    A. 5%
    B. more than 0.5%
    C. less than 0.5%
    D. 7.5%

B. more than 0.5%

37. It is a type of spring wire used in precision and dimensional precision applications.
    A. Helical spring wire
    B. stainless steel
    C. hand drawn wire spring
    D. piano wire

C. hand drawn wire spring

38. What is the hard drawn (80% reduction) spring wire made of high carbon steel?
    A. Oil temper wire
    B. music wire
    C. tension wire
    D. chromium wire

B. music wire

39. Which of the following wires with good quality and is used for impact loading?
    A. Hard drawn wire
    B. song wire
    C. helical spring wire
    D. chromium silicon wire

D. chromium silicon wire

40. When heat-treated wire is coiled cold, it should be stress relieved for bending stress and after cooling it is heated at some:
    A. 400°F
    B. 600°F
    C. 700°C
    D. 500°F

D. 500°F

41. Which of the following is not a function of spring?
    A. Absorbs energy
    B. source of potential energy
    C. measure weight
    D. measure thickness

D. measure thickness

42. Which of the following is the type of spring made in the form of dished washer?
    A. Air spring
    B. believe spring
    C. volute spring
    D. motor spring

B. believe spring

43. What is the type of failure due to instability?
    A. Buckling
    B. slenderness ratio
    C. Stability
    D. Euler’s failure

A. Buckling

44. What type of formula that is best applied to a very slender column?
    A. Column formula
    B. Slenderness formula
    C. Stability formula
    D. Buckling formula

A. Column formula

45. If two principal stresses are zero, the state of stress is:
    A. Biaxial
    B. mono-axial
    C. uniaxial
    D. triaxial

C. uniaxial

46. What do you call the system that has finite values of principal stresses?
    A. Triaxial
    B. Uniaxial
    C. monoaxial
    D. biaxial

A. Triaxial

47. A screw that requires positive torque to lower the load, or to loosen the screw if it has been turned tight against a resistance.
    A. Self locking screw
    B. lock screw
    C. self screw
    D. power screw

D. power screw

48. What is the rotating member used in transmitting power?
    A. Shaft
    B. counter shaft
    C. axle
    D. washer

A. Shaft

49. For machineries shop the permissible deflection is approximately:
    A. 0.02in/ft
    B. 0.03in/ft
    C. 0.01in/ft
    D. 0.05in/ft

A. 0.02in/ft

50. For shafts, the shear due to bending is a maximum at the neutral plane where the normal stress is:
    A. Minimum
    B. Constant
    C. maximum also
    D. zero

D. zero

51. The minimum value of numerical combined shock and fatigue factor to be applied in every case to the computed bending moment of the shaft is:
    A. 2.0
    B. 1.75
    C. 1.5
    D. 1.3

C. 1.5

52. What is the other name given to short shafts in machines?
    A. Spindles
    B. head shafts
    C. core shafts
    D. heel shafts

A. Spindles

53. The other name given to a line shaft.
    A. Countershaft
    B. Main shaft
    C. long shaft
    D. crank shaft

B. Main shaft

54. The speed at which the center of mass will be equal the deflecting forces on the shaft; the shaft with its attached bodies will then vibrate violently, since the centrifugal force changes its direction as the shaft turns in:
    A. Nominal speed
    B. Critical speed
    C. Relative speed
    D. Mean speed

B. Critical speed

55. An old rule of thumb for transmission shafting is that the deflection should not exceed _ of length between supports.
    A. 0.01 in. per foot
    B. 0.08 in. per foot
    C. 0.02 in. per foot
    D. 0.05 in. per foot

A. 0.01 in. per foot

56. For transmission shafts the allowable deflection is 1 degree in a length of _ diameters.
    A. 20
    B. 25
    C. 30
    D. 40

A. 20

57. What is the limiting torsional deflection for machinery shafts, if the criteria of limiting torsional deflection vary from 0.08° per foot of length?
    A. 1°
    B. 2.5°
    C. 2°
    D. 3.5°

A. 1°

58. Bevel gears of sizes 5 inches to 15 inches should not be lapped or depress more than _.
    A. 0.0044
    B. 0.0044–0.0093
    C. 0.002
    D. 0.001

B. 0.0044–0.0093

59. What type of key that allows the hub to move along the shaft but prevents the rotation of the shaft?
    A. Woodruff key
    B. Feather key
    C. Gibbs key
    D. Square key

B. Feather key

60. What is the other name for Kennedy key?
    A. Tangential key
    B. Woodruff key
    C. Saddle key
    D. Roll pin

A. Tangential key

61. What type of fits used for involute spline?
    A. Close fit
    B. Press fit
    C. sliding fit
    D. All of these

D. All of these

62. It is used for permanent fits and similar to involute splines except that the pressure angle is 14.5°.
    A. Separation load
    B. Splines shaft
    C. Stub serrations
    D. Involute serrations

D. Involute serrations

63. It is used in a coupling or in addition to another coupling where, in case of overload, there is danger of injury to machine or to material in process.
    A. Shear pin
    B. Flange coupling
    C. Involute serrations
    D. King pin

A. Shear pin

64. What is the maximum shaft angle for a single Hooke’s coupling?
    A. 10°
    B. 17°
    C. 15°
    D. 20°

C. 15°

65. What are the two principal parts of a Journal Bearing?
    A. Bearing and journal
    B. Shaft and babbit
    C. Clearance and fitted
    D. Shaft and cylinder

A. Bearing and journal

66. When the line of action of the load bisects the arc of partial bearing, the bearing said to be:
    A. Eccentrically loaded
    B. Fully loaded
    C. Centrally loaded
    D. Partially loaded

C. Centrally loaded

67. What is the difference in radii of the bearing and journal?
    A. Even clearance
    B. Clearance ratio
    C. Odd clearance
    D. Radial clearance

D. Radial clearance

68. When radii of both the bearing and the journal are the same, then the bearing is said to be:
    A. Fitted bearing
    B. Clearance bearing
    C. Full bearing
    D. Ambiguous bearing

A. Fitted bearing

69. What is the line that passes through the centers of the bearing and the journal?
    A. Line of action
    B. Line of centers
    C. Line of symmetry
    D. Tangent line

B. Line of centers

70. Which of the following is considered advantageous for bearing materials?
    A. Conformability
    B. Compatibility
    C. Embed ability
    D. All of these

D. All of these

71. A conclusion repeatedly verified by experiment is that the smoother surface:
    A. Has the greater load capacity of the bearing
    B. Has the lesser capacity of the bearing
    C. Has constant load
    D. None of these

A. Has the greater load capacity of the bearing

72. Which of the following considers the 200 series of bearing?
    A. Heavy
    B. Medium
    C. Light
    D. All of these

C. Light

73. Which of the following considers the 300 series of bearing?
    A. Medium
    B. Heavy
    C. Light
    D. All of these

A. Medium

74. A type of roller bearing in which the balls are assembled by the eccentric displacement of the inner ring.
    A. Filling slot ball bearing
    B. filling slot ball bearing
    C. self-aligning ball bearing
    D. deep-groove ball bearing

D. deep-groove ball bearing

75. Which of the following is not a type of ball bearing?
    A. shallow groove ball bearing
    B. filling slot ball bearing
    C. self-aligning ball bearing
    D. deep-groove ball bearing

A. shallow groove ball bearing

76. Which of the following is the approximate density of the leather belt?
    A. 0.035 lb/in³
    B. 0.0135 lb/in³
    C. 0.025 lb/in³
    D. 0.0465 lb/in³

A. 0.035 lb/in³

77. Which of the following is the approximate density of a fat rubber belt?
    A. 0.055 lb/in³
    B. 0.0135 lb/in³
    C. 0.045 lb/in³
    D. 0.0465 lb/in³

C. 0.045 lb/in³

78. A toothed wheel whose tooth elements are straight and parallel to the shaft axis or used to transmit motion and power between parallel shafts.
    A. Helical gear
    B. Spur gear
    C. Worm gear
    D. Bevel gear

B. Spur gear

79. The breaking strength of oak-tanned beltings varies and is never less than:
    A. 5 ksi
    B. 6 ksi
    C. 7 ksi
    D. 9 ksi

B. 6 ksi

80. Experience suggests that the most economical designs are obtained for a belt speed of:
    A. 6000 to 7500 fpm
    B. 5000 to 7000 fpm
    C. 3500 to 6000 fpm
    D. 5000 to 1000 fpm

A. 6000 to 7500 fpm

81. The tension in the belt due to centrifugal force increasing rapidly above about:
    A. 2500 fpm
    B. 3000 fpm
    C. 35000 fpm
    D. 4000 fpm

A. 2500 fpm

82. For leather belts, recommended speed is:
    A. 6000 to 7000 fpm
    B. 5000 to 6000 fpm
    C. 7000 to 8000 fpm
    D. 4500 to 5600 fpm

C. 7000 to 8000 fpm

83. The recommended initial tension of the belt is:
    A. 75 lb/in of width
    B. 73 lb/in of width
    C. 71 lb/in of width
    D. 80 lb/in of width

C. 71 lb/in of width

84. Two shafts at right angles to each other may be connected by what arrangement?
    A. Half turn
    B. Quarter turn
    C. ¾ turn
    D. One turn

B. Quarter turn

85. The minimum number of teeth on a smaller sprocket for low speed is:
    A. 12
    B. 21
    C. 17
    D. 14

A. 12

86. The minimum number of teeth on a smaller sprocket for moderate speed is:
    A. 17
    B. 21
    C. 12
    D. 14

A. 17

87. The minimum number of teeth on a smaller sprocket for high speed is:
    A. 21
    B. 24
    C. 12
    D. 14

A. 21

88. The resultant of a pair of equal forces but opposite in direction is:
    A. Concurrent
    B. Couple
    C. Non-concurrent
    D. Resultant

B. Couple

89. The helical and herringbone gear teeth cut
    after heat treatment should have a hardness in
    the range of 210/300 BHN. The pinion gear
    teeth hardness on the other hand ideally/normally
    should be at __ BHN.
    A. 250/320
    B. 350/380
    C. 400
    D. 340/350

D. 340/350

90. As a rule, the center distance between
    sprockets should not be less than __
    times the diameter of the bigger sprocket and
    not less than 30 times the pitch nor more than
    about 50 times the pitch.
    A. 1.5
    B. 2
    C. 2.5
    D. 3

A. 1.5

91. A single force which produces the same effect
    upon a mass as two or several forces acting
    together is called:
    A. Components
    B. Composition forces
    C. Resolution forces
    D. Resultant

D. Resultant

92. All forces in the same plane are called:
    A. Coplanar
    B. Couple
    C. Parallel
    D. Resultant

A. Coplanar

93. Which of the following laws which states that
    the force of attraction between two bodies is
    directly proportional to the product of their
    masses and inversely proportional to distance
    square between their centers.
    A. Hooke’s law
    B. Law of gravitation
    C. Law of motion
    D. Newton’s law

B. Law of gravitation

94. Any object thrown upward will return to earth
    with the magnitude of the terminal velocity
    equal to:
    A. 50% of the initial velocity
    B. 80% of the initial velocity
    C. About 90% of the initial velocity
    D. The initial velocity

D. The initial velocity

95. Flat belt that is too tight will induce strain on
    the bearing and belt __.
    A. Life will be shortened
    B. Result to uneconomical operation
    C. Suffer/shatter
    D. Will be sheared/cut

A. Life will be shortened

96. The resulting cross-sectional area of the tensile
    test specimen divided by the specimen original
    area is called:
    A. Charpy test
    B. % elongation
    C. Impact test
    D. Load test

B. % elongation

97. SAE 51XXX belongs to the __ steel
    family.
    A. Carbon
    B. Chromium
    C. Manganese
    D. Nickel

B. Chromium

98. In itself, it is a lubricant and usually one of the
    important elements in casting non-ferrous
    metals like bronze, for example:
    A. Antimony
    B. Babbit
    C. Lead
    D. Zinc

C. Lead

99. Gasket material, which should avoid hot
    liquid/steam applications.
    A. Asbestos fiber
    B. Nylon fiber
    C. Rubberized
    D. Wool

C. Rubberized

100. The same material properties all over / direction
     and at any particular point in a structural
     member is:
     A. Heterogeneous
     B. Homogenous
     C. Isentropic
     D. Isotropic

D. Isotropic