MD ELEMENTS 18

1. Which of the following has been considered as general purpose rope?
   A. 6 x 19 IWRC
   B. 7 x 25 IWRC
   C. 7 x 25 IWRC
   D. 6 x 9 IWRC

A. 6 x 19 IWRC

2. What is the maximum shaft angle for a single Hooke's coupling?
   A. 10 degrees
   B. 17 degrees
   C. 15 degrees
   D. 20 degrees

C. 15 degrees

3. 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

4. When the line of action of the load, bisects the arc of partial bearing, the bearing is said to be:
   A. eccentrically loaded
   B. fully loaded
   C. centrally loaded
   D. partially loaded

C. centrally loaded

5. 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

6. Which of the following cannot be a Poisson's ratio of a material?
   A. 0.35
   B. 0.40
   C. 0.75
   D. 0

C. 0.75

7. 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

8. Which of the following considers the 200 series of bearing?
   A. heavy
   B. medium
   C. light
   D. all of these

C. light

9. Which of the following considers the 300 series of bearing?
   A. heavy
   B. medium
   C. light
   D. all of these

B. medium

10. A type of roller bearing in which the balls are assembled by the eccentric displacement of the inner ring.
    A. shallow grove ball bearing
    B. fillingslot ball bearing
    C. self-aligning ball bearing
    D. deep-groove ball bearing

D. deep-groove ball bearing

11. Which of the following is not a type of ball bearing?
    A. shallow grove ball bearing
    B. fillingslot ball bearing
    C. self-aligning ball bearing
    D. deep-grove ball bearing

A. shallow grove ball bearing

12. Which of the following is the approximate density of the leather belt?
    A. 0.035 lb/in^3
    B. 0.0135 lb/in^3
    C. 0.025 lb/in^3
    D. 0.0465 lb/in^3

A. 0.035 lb/in^3

13. Which of the following is the approximate density of a fat rubber belt?
    A. 0.055 lb/in^3
    B. 0.0135 lb/in^3
    C. 0.045 lb/in^3
    D. 0.0465 lb/in^3

C. 0.045 lb/in^3

14. 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

15. The breaking strength of oak-tanned belting varies from 3 or more than:
    A. 5 ksi
    B. 6 ksi
    C. 7 ksi
    D. 9 ksi

B. 6 ksi

16. Experience suggests that the most economical designs are obtained for a belt speed of:
    A. 6000 to 7500 fpm
    B. 3000 to 5000 fpm
    C. 3500 to 4700 fpm
    D. 3000 to 1000 fpm

A. 6000 to 7500 fpm

17. The tension in the belt due to centrifugal force increases rapidly above about:
    A. 2500 fpm
    B. 3000 fpm
    C. 3500 fpm
    D. 4000 fpm

A. 2500 fpm

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

D. 4500 to 5600 fpm

19. For fabric belts, the recommended speed is:
    A. 4000 to 5000 fpm
    B. 3000 to 4000 fpm
    C. 2000 to 4000 fpm
    D. 2000 to 3000 fpm

C. 2000 to 4000 fpm

20. 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

21. Two shafts at right angles to each other may be connected by what arrangement?
    A. Half turn
    B. Quarter turn
    C. 3/4 turn
    D. One turn

B. Quarter turn

22. A statement of how the total moment is derived from a number of forces acting simultaneously at a point.
    A. Goodman's theorem
    B. Soderberg's theorem
    C. Varignon's theorem
    D. Moore's theorem

C. Varignon's theorem

23. A simple mechanical machine with the ability to increase an applied force:
    A. Hinges
    B. Lever
    C. Roller
    D. Spring

B. Lever

24. Any device used to raise or lower an object.
    A. Hoist
    B. Spring
    C. Lever
    D. Roller

A. Hoist

25. A measure of the material's ability to yield and absorb highly localized and rapidly applied stresses:
    A. Hardness
    B. Stiffness
    C. Toughness
    D. Resilience

C. Toughness

26. A material can fail after repeated loadings even if the stress level never exceeds the ultimate strength.
    A. fatigue failure
    B. Ductile failure
    C. Brittle failure
    D. Mechanical failure

A. fatigue failure

27. The load at which a column fails is known as:
    A. Dead load
    B. Critical load
    C. Moving load
    D. Dynamic load

B. Critical load

28. The percentage difference of solid and working deflections is known as:
    A. Cash allowance
    B. Spring rate
    C. Spring allowance
    D. Spring index

A. Cash allowance

29. A shaft's natural frequency of vibration is referred to as the:
    A. high speed
    B. critical speed

B. critical speed

30. A fine finishing operation, similar to polishing, using a very fine polishing compound.
    A. Buffing
    B. Burnishing
    C. Calonizing
    D. Electroplating

B. Burnishing

31. A process in which metal is dipped in dilute acid solutions to remove dirt, grease, and oxides.
    A. Pickling
    B. Sheradizing
    C. Polishing
    D. Parkerizing

A. Pickling

32. Which of the following is used to change the direction of an applied tensile force?
    A. Gear
    B. Flywheels
    C. Pulleys
    D. Ropes

A. Gear

33. For most wire ropes and chains with 180° contact, the loss factor at low speed varies between:
    A. 1.03 to 1.06
    B. 1.25 to 1.50
    C. 1.07 to 1.15
    D. 1.60 to 1.80

C. 1.07 to 1.15

34. What method is used to determine the reactions on continuous beams?
    A. two-moment equations
    B. three-moment equations
    C. second moment equations
    D. third moment equations

B. three-moment equations

35. What is the best method for increasing a spring's fatigue life?
    A. Sprinkling
    B. Stress relieving
    C. Shot peening
    D. Short peening

C. Shot peening

36. The distance from a point on one gear to the corresponding point measured along the base circle.
    A. Diametral pitch
    B. Normal pitch
    C. Chordal pitch
    D. Circular pitch

A. Diametral pitch

37. Which of the following is a single measure that combines the external dynamic load of an application with a gear drive's reliability and operating life?
    A. ratio factor
    B. reliability factor
    C. service factor
    D. life factor

B. reliability factor

38. Describes very rough grinding, such as that performed in foundries to remove gates, fins, and risers from casting.
    A. Snagging
    B. Lapping
    C. Honing
    D. Snuggling

A. Snagging

39. A fine grinding operation used to obtain exact fit and dimensional accuracy.
    A. Honing
    B. Lapping
    C. Buffing
    D. Burnishing

B. Lapping

40. The process of separating different sizes of the same material.
    A. Screening
    B. Sieving
    C. Separation
    D. Fractioning

B. Sieving

41. The process of separating a material into a variety of specifically sized groups.
    A. Centrifuging
    B. Sieving
    C. Fractioning
    D. Screening

C. Fractioning

42. An interrupted quenching process resulting in an austenite-to-bainite transition.
    A. Austempering
    B. Martempering
    C. Austenitizing
    D. Martenitizing

A. Austempering

43. The material will become progressively stronger, harder, and more brittle until it eventually fails.
    A. Hot working
    B. Tempering
    C. Cold working
    D. Normalizing

C. Cold working

44. A swinging support constructed as part of the vessel and that supports the manway cover when it is unbolted and moved aside.
    A. Nozzles
    B. Handholes
    C. Davit
    D. Orifice

C. Davit

45. Which of the following is the measure of torsional stress?
    A. accuracy
    B. stiffness
    C. rigidity
    D. quality

A. accuracy

46. When tested in compression, ductile materials usually exhibit characteristics up to the yield strength as they do when tested in tension.
    A. the same
    B. more than
    C. more than
    D. approximately the same

D. approximately the same

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

A. Bilateral

48. A fit generally used on those dimensions involved in such as pin in a hole.
    A. Unilateral
    B. Lateral
    C. Bilateral
    D. None of these

B. Lateral

49. It is relatively finely spaced irregularities of the surface.
    A. Smoothness
    B. Waviness
    C. Lay
    D. Roughness

D. Roughness

50. It is the surface finish of heavy cuts or coarse feed.
    A. 200 rms
    B. 400 rms
    C. 80 rms
    D. 500 or greater rms

D. 500 or greater rms

51. Which of the following is the most dominant cause (approximately 80%) of machine failure?
    A. Torsion
    B. Negligence
    C. Fatigue failures
    D. Compression

C. Fatigue failures

52. Wrought steel in its commonly met commercial, it is often assumed that the average endurance for an average
    𝑆
    𝑢
    S
    u
    ​

    (50% survival), the Brinell hardness is limited to:
    A. 500
    B. 400
    C. 240
    D. 450

B. 400

53. What is the range of the endurance ratio or Cast-Iron's values for steel?
    A. 0.23 to 0.65
    B. 0.34 to 0.87
    C. 0.63 to 0.93
    D. 0.34 to 0.45

B. 0.34 to 0.87

54. Which of the following indicates the degree of concentration?
    A. Power factor
    B. Service factor
    C. Stress factor
    D. Stress concentration factor

D. Stress concentration factor

55. The internal stresses that exist in any part of the material that is subjected to temperature and not acted upon by an external load.
    A. Residual stress
    B. Form stress
    C. Superposed stress
    D. Control stress

A. Residual stress

56. It is the process that cold works a limited amount of material, thus giving a higher strength, and it leaves a surface compressive stress.
    A. Surface finishing
    B. Tensioning
    C. Surfacing
    D. Surface rolling

B. Tensioning

57. Fatigue strength is increased by repeated loads
    just below the normal fatigue limit, followed by
    small step by step increase of the loading.
    A. Coaxing
    B. Triaxing
    C. Mixing
    D. Relieving

A. Coaxing

58. It is the diameter of the imaginary cylinder that bounds the crest of an external thread and the roots of an internal thread.
    A. Mean diameter
    B. Root diameter
    C. Stress diameter
    D. Major diameter

D. Major diameter

59. It is the distance in inches a screw thread (a helix) advances axially in one turn.
    A. Pitch
    B. Mean pitch
    C. Lead
    D. Circular pitch

A. Pitch

60. Which of the following bolts is recommended for general use?
    A. UNC
    B. UNF
    C. UNEF
    D. NC

A. UNC

61. It is frequently used bolt in automotive and aircraft industries.
    A. UNC
    B. UNEF
    C. UNF
    D. NC

C. UNF

62. Which of the following is particular bolt used in aeronautical equipment?
    A. UNC
    B. UNEF
    C. UNF
    D. NC

B. UNEF

63. What type of bolt usually used for high-pressure pipe flanges, cylinder head studs etc?
    A. UNC
    B. UNF
    C. UNEF
    D. 8 UN

D. 8 UN

64. It is the stress or load induced by the tightening operation.
    A. Initial stress
    B. Initial tension
    C. Residual stress
    D. None of these

A. Initial stress

65. For non-metallic gaskets, it has been found that they should have a certain minimum amount of compression as ____ for a certain cork gasket.
    A. 62%
    B. 86%
    C. 68%
    D. 76%

A. 62%

66. It is a screw fastening with a nut on it.
    A. Bolt
    B. U-bolt
    C. Rivet
    D. Screw

A. Bolt

67. A fastening which has no nut and turns in to a threaded hole.
    A. Bolt
    B. Fastener
    C. Rivet
    D. Screw

D. Screw

68. An old name for an unfinished through bolt comes with square.
    A. Coupling bolt
    B. Stud bolt
    C. Machine bolt
    D. Automobile bolt

C. Machine bolt

69. It is a type of coil where the helical coil is wrapped into a circle forming an annular ring.
    A. Volute spring
    B. Hairspring
    C. Motor spring
    D. Garter spring

A. Volute spring

70. It is a type of spring where thin flat strip wound up on itself as a plane spiral, usually anchored at the inside end.
    A. Motor spring
    B. Garter spring
    C. Volute spring
    D. Helical spring

A. Motor spring

71. The ratio of the length of the column and the radius of gyration of the cross-sectional area about a centroidal axis.
    A. Contact ratio
    B. Slenderness ratio
    C. Centroidal ratio
    D. Column ratio

B. Slenderness ratio

72. Under the theories of failure, for static loading of ductile material, the design stress is:
    A. Yield Stress/Factor of Safety
    B. Ultimate Stress/Factor of Safety
    C. Ultimate stress/Proportional Limit
    D. Yield point/Proportional Limit

A. Yield Stress/Factor of Safety

73. Under theories of failure, the value of shear stress is how many times that of the tensile stress?
    A. Four times
    B. Half
    C. Double
    D. One-fourth

B. Half

74. The theory of mechanics of material shows that the result from the octahedral shear stress theory and those from the maximum distortion-energy theory are:
    A. the same
    B. less than
    C. more than
    D. not related

A. the same

75. It is the distance measure auxiliary from a point on one thread to the corresponding point on an adjacent thread.
    A. Axial pitch
    B. Z-pitch
    C. Lead
    D. Lead angle

A. Axial pitch

76. It is the angle between a tangent to the pitch helix and plane normal to the axis of the screw.
    A. Lead angle
    B. Held angle
    C. Tangential angle
    D. Vertical angle

A. Lead angle

77. It is suggested that the design factor on the yield strength be about 1.5 for the smooth load, about 2 to 2.25 for minor shock loading, and up to ___ for severe shock loads, especially when the loading reverses during operation.
    A. 4.5
    B. 3.5
    C. 3.0
    D. 4.0

A. 4.5

78. A typical hub length fall between:
    A. 1.25D to 2.5D
    B. 1.35D to 3.4E
    C. 1.25D to 4.0D
    D. D to 7.0D

A. 1.25D to 2.5D

79. A key that are square or flat and tapered with head
    A. Pin keys
    B. Gib-head keys
    C. Saddle keys
    D. None of these

B. Gib-head keys

80. A key that may either straight or tapered. It is usually a drive fit.
    A. Pin key
    B. Gib-head keys
    C. Saddle key
    D. None of these

B. Gib-head keys

81. A key with one several patented methods of keying is driven or pressed into a hole that is small enough to close the slit, assembled in radial direction.
    A. Fit key
    B. Roll pin
    C. Saddle key
    D. Pin key

B. Roll pin

82. A key that allows the hub to move along the shaft but prevents the rotation of the shaft.
    A. Woodruff key
    B. Feather key
    C. Gibs key
    D. Square key

B. Feather key

83. For involute spline, the type of fits used:
    A. Close fit
    B. Sliding fit
    C. Press fit
    D. All of these

D. All of these

84. A coupling that transmits power via the frictional forces induced by pulling the flange toward each other over slotted tapered sleeves.
    A. Flange coupling
    B. Ribbed compression coupling
    C. Rigid coupling
    D. Flanged compression coupling

D. Flanged compression coupling

85. A coupling used for absorbing some shock and vibration that may appear on one shaft and of preventing the occurrence of reversed stresses caused by the shaft deflecting at the coupling.
    A. Rigid coupling
    B. Flange coupling
    C. Flexible coupling
    D. None of these

C. Flexible coupling

86. It is the difference in the radii of the bearing and the journal.
    A. Even clearance
    B. Fit clearance
    C. Clearance ratio
    D. Radial clearance

D. Radial clearance

87. A bearing in which the radii of the journal and the bearing are the same.
    A. Fitted bearing
    B. Full bearing
    C. Partial bearing
    D. Clearance bearing

A. Fitted bearing

88. What is the approximate length-to-diameter ratio of hydrodynamic bearings?
    A. 4
    B. 3
    C. 2
    D. 2

A. 4

89. The operating temperature of oil films in the bearing must approximately:
    A. 140°F to 150°F
    B. 140°F to 160°F
    C. 120°F to 190°F
    D. 120°F to 190°F

B. 140°F to 160°F

90. At the higher temperatures, oil oxidizes more rapidly above:
    A. 200°F
    B. 140°F
    C. 180°F
    D. 100°F

A. 200°F

91. For thrust bearing, the special at moderate operating condition is:
    A. 50xVm^230fpm
    B. 50xVm^230fpm
    C. 50xVm^220fpm
    D. 50xVm^250fpm

A. 50xVm^230fpm

92. If the ends are joined by wire lacing with machine, the usual efficiency of joint is:
    A. 100%
    B. 75%
    C. 85%
    D. 88%

D. 88%

93. On high speed centrifugal blowers, it has been observed that the arc of contact is reduced from 180° at rest to _ in motion.
    A. 100°
    B. 90°
    C. 95°
    D. 110°

D. 110°

94. The recommended net belt pull for rubber belt is:
    A. 11.34lb/ply per inch of width
    B. 13.75lb/per inch of width
    C. 16.35lb/ply per inch of width
    D. 20.34lb/ply per inch of width

B. 13.75lb/per inch of width

95. For minimum quietness, use sprockets with ____ or more teeth.
    A. 21
    B. 23
    C. 25
    D. 27

D. 27

96. If two intersecting shafts are to be belt connected ____ guide pulleys are to be used.
    A. 2
    B. 3
    C. 4
    D. 4

B. 3

97. Wire ropes are made from cold-drawn with ___ or more teeth.
    A. 21
    B. 23
    C. 25
    D. 27

D. 27

98. A wire rope that the wires and strands are twisted in the opposite direction.
    A. Long lay
    B. Perform
    C. Regular lay
    D. Lang lay

C. Regular lay

99. A wire rope that the wires and strand are twisted in the same direction.
    A. Long lay
    B. Perform
    C. Regular lay
    D. Lang lay

D. Lang lay

100. Which of the following ropes is used for haulage, rigging, and guard rails?
     A. 6 x 35 IWRC
     B. 6 x 15 IWRC
     C. 7 x 8 IWRC
     D. 7 x 7 IWRC

A. 6 x 35 IWRC