Elements 4

1. Past ME Board Question
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

2. Past ME Board Question
Which of the following is NOT the other name of circumferential stress for thin walled cylinders.
A. hoop Stress
B. girth Stress
C. tangential Stress
D. longitudinal Stress

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

4. A thin walled pressurized vessel consists of a right circular cylinder with flat ends. Midway between the ends the stress is greatest in what direction?
A. Longitudinal:
B. Circumferential
C. Radial
D. At an angle 45° to the longitudinal and circumferential direction

5. Past ME Board Question
Clutch slippage while clutch is engaged is especially noticeable

A. during idling.
B. a low speed.
C. during acceleration.
D. during braking.

6. Supplementary Question
Which of the following statements) is correct for an oilless bearing?
A. the oil film is maintained by supplying oil under pressure
B. the oil film pressure is produced only by rotation of the journal.
C.do not need external supply of lubricant
D. grease is needed to be applied after some intervals

7. Past ME Board Question
The rated life of a bearing changes
A. inversely as cube of load.
B. directly as load.
C. inversely as square of load.
D. inversely as load.

8. Past ME Board Question
In order to realize the advantage of fluid friction, it is essential to have
A. no oil film.
B. converging oil film.
C. diverging oil film.
D. parallel oil film in bearing.

9. Past ME Board Question
Which of the following has the same thermal and minimum film thickness limitation as sleeve bearing?
A. 'ball bearing
B. roller bearing
C. thrust bearing
D. oil bearing

10. Past ME Board Question
Hydrostatic bearing is one which
A. the lube oil is supplied under pressure
B. lube oil is not pressurized
C. there is no lube oil
D. bearing is lightly loaded

11. Past ME Board Question
Which of the following materials is unsuitable as a bearing?
A. Teflon
B. Low carbon steel
C. Cast iron
D. Nylon

12. Past ME Board Question
Hydrostatic bearing is one which
A. the lube oil is supplied under pressure.
B. lube oil is not pressurized.
C. there is no lube oil.
D. bearing is lightly loaded.

13. Past ME Board Question
Which of the following is unsuitable as a bearing material ?
A. Teflon
B. Low carbon steel
C. Cast iron
D.. Nylon

14. Past ME Board Question
The purpose of these parts in application are to have better bearings to seal the guard against marring, etc.
A. bearing journal
B. metallic seal
C. washer
D. shaft seal

15. Past ME Board Question
Eccentrically loaded bearing is also called
A. full bearing
B. offset bearing
C. partial bearing
D. fitted bearing

16. Past ME Board Question
What type of bearing which totally encloses the shaft?
A. offset bearing
B. central bearing
C. babbit bearing
D. full bearing

17. Past ME Board Question
A thin walled pressurized vessel consists of a right circular cylinder with flat ends. Midway between the ends the stress is greatest in what direction?

A. Longitudinal
B. Circumferential
C. Radial
D. At an angle 45° to the longitudinal and circumferential direction

18. Past ME Board Question
This is a lubrication where the load-carrying surfaces of the bearing are separated by a relatively thick film of lubricant, so as to prevent metal-to-metal contactand where the stability of the film can be explained by the laws of fluid mechanics.
A. Hydrostatic lubrication
B. Hydrodynamic lubrication
C. Elastohydrodynamic lubrication
D. Boundary lubrication

19. Past ME Board Question
In pressure vessels, which of the following resists internal pressure through tension?
Answer:

A. shell-type element

B. cam type element

C. plate-type element

D. spherical type element

20. Past ME Board Question
In pressure vessels, which of the following resists internal pressure through bending?
A. shell-type element
B. cam type element
C. plate-type element
D. spherical type element

21. Past ME Board Question
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

22. Past ME Board Question
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

23. Past ME Board Question
What is the difference in radii of the bearing and Journal?
А. even clearance
B. clearance ratio
C. odd clearance
D. radial clearance

24. Past ME Board Question
How do you call a ball bearing with race containing pronounced groove for rolling elements?
А. Crown bearing
B. Conrad bearing
C. Angular-contact bearing
D. Cylindrical bearing

25. Past ME Board Question
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

26. What friction devices that are used to connect shafts?
A. clutches
B. spring
C. brakes
D. holders

27. Past ME Board Question
Which of the following machine members that supports another part that rotates, slides, or oscillates in or on it?
A. Pulley
B. Key
C. Bearing
D. Shaft

28. Past ME Board Question
How do you call the study of lubrication, friction, and wear of moving or stationary parts?

A. Lubrication

B. Tribology

C. Hydrodynamics

D. Hydrostatics

29. Past ME Board Question
Which of the following is the line that passes through the centers of the bearing and the journals?

A. line of action

B. line of centers

C. line of symmetry

D. tangent line

30. Past ME Board Question
Which of the following is the type of bearing that permits constrained relative motion of rigid parts lubricant is generally inserted or supplied between the mating surfaces to reduce friction and wear, and to carry away the heat generated?
A. Sliding Contact Bearing
B. Rolling Contact Bearing
C. Thrust Bearing
D. Journal Bearing

31. Past ME Board Question
Which of the following is considered advantageous for bearing materials?
A. conformability
B. compatibility
C. embeddability
D. all of these

32. Past ME Board Question
Which of the following considers the 200 series of bearing?
A. heavy
B. medium
C. light
D. all of these

33. Past ME Board Question
Which of the following considers the 300 series of bearing?
А. heavy
B. medium
C. light
D. all of these

34. Past ME Board Question
A type of roller bearing in which the balls are assembled by the eccentric displacement of the inner ring.
A. shallow groove ball bearing
B. filling-slot ball bearing
C. self-aligning ball bearing
D. deep-groove ball bearing

35. Past ME Board Question
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

36. Past ME Board Question
A bearing in which the radii of the journal and the nearing are the same.
А. fitted bearing
B. full bearing
C. partial bearing
D. clearance bearing

37. Past ME Board Question
What is the approximate length-to-diameter ratio of hydrodynamic bearings?
A. 1
B. 4
C. 3
D. 2

38. Past ME Board Question
The operating temperature of oil films in the bearing are 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

39. Past ME Board Question
For thrust bearing, the speed at moderate operating condition is ____.

A. 50 < Vm < 200 fpm

B. 50 < Vm < 250 fpm

C. 50 < Vm < 220 fpm

D. 50 ≤ Vm < 250 fpm

40. Which of the following clutches that has a disadvantage of heavier rotating masses?
A. Multiple disc clutch
B. Cone clutch
C. Disc clutc
D. Twin Clutching

41. Which of the following is the bearing used for low load and less expensive production?
A. Babbitt
B. Ball bearing
C. Roller bearing
D. Self aligning

42. It is a low cost bearing used worldwide for automobile or low horsepower motor applications. It is made of thin coating of over flat metal strip.
A. babbitt
B. cadmium brass
C. lead
D. thin

43. Past ME Board Question
A bearing that primarily guides the motion of a machine member without specific regard to the direction of load application.

A. Journal bearing
B. Tapered roller bearing
C. Guide bearing
D. Thrust bearing

44. Which of the following is the basis in the analysis for
OLD clutches installed in the system?
A.. Uniform pressure theory
B.. Uniform wear theory
C. Universal friction theory
D. All of these

45. Roller bearing is utilized on ——
carrying capacity
and is better than ball bearing in this condition.

A. heavy load

B. high temperature load

C. low load

D. reversing load

46. To hold to minimum, the axial direction of deflection/movement, a separate thrust bearing or preloaded bearing capable of absorbing considerable load is required. The type of bearing to use is a —-
bearing.

A. deep grove ball
B. double row angular contract
C. tapered roller bearing
D. wide type self-aligning

47. Special bearing used with high deflection.
A. Babbitt
В. Ball
C. Roller
D. Self aligning

48. In journal bearing, the load acts—— to the axis of the shaft?

A. perpendicular

B. parallel

C. along

D. off tangent

49. 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

50. Past ME Board Question
Fluid film desired between two surfaces having relatively sliding motion.
A. lube oil
B. graphite
C. packing
D. lubrication

51. In thrust bearing, the load acts ____ the shaft?
to the axis of
A. perpendicular
B. parallel
C. along
D. off tangent

52. Past ME Board Question
In general, to engage securely and prevent dragging, what is the clearance between release bearing and release collar in the clutch?
A. 2 - 3 mm
B. 4 - 5 mm
C. 6 - 7 mm
D. 8 - 9 mm

53. What is the special bearing used with high deflection?
A. Babbitt
В. Ball
C. Roller
D. Self aligning

54. In which of the following carrying capacity where roller bearing is utilized better than ball bearing?
А. heavy load
B. high temperature load
C. low load
D. reversing load

55. Which of the following would cause hot bearings?
A. improper oil
B. improper alignment
C. dirt in oil
D. all of the above

56. The most known lubricants being utilized in whatever category of load and speed are oil, air, grease and dry lubricants like
A. Bronze
B. Graphite
C. Lead
D. Silicon

57. Past ME Board Question
How do you call the lubrication condition where non-conformal surfaces are completely separated lubricant film and no asperities are in contact?
A. Elastohydrodynamic lubrication
C. Splash buoundary lubrication
B. Hydrodynamic lubrication
D. Hydrostatic lubrication

58. 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

59. Past ME Board Question
Fluid film desired between two surfaces having relative sliding motion.
A. lube oil
B. lubrication
C. graphite
D. grease

60. Past ME Board Question
Fluid film desired between two surfaces having relative sliding motion.
A. Lubrication
B. seal
C. packing
D. safety shield

61. The rule of thumb in journal bearing design the clearance ratio should be ___.

A. 0.0090

B. 0.0010

C. 0.0042

D. 0.00120

62. To avoid scoring in the bearing surface and the shaft due to contamination/absorption of the fine dirt in the bearing during operation/lubrication the bearing material to apply should have good ____ properties.
A. anti-scoring
B. resistance conformability
C. corrosion resistance
D. embeddability

63. Past ME Board Question
At higher temperatures, oil oxidizes more rapidly above what temperature?
A. 120°F
B. 200°F
C. 140°F
D. 160°F

64. Past ME Board Question
Which of the following is the usual angle between surface friction line and axis of the cone clutch?

A. 16°

B. 22°

C. 7.5°

D. 12.5°

65. In the design of a plate clutch, which of the following is the reason why uniform wear condition is the usual assumption ?
A. Uniform wear is the safest design assumption.
B. The design is cost effective in uniform wear.
C. Uniform wear the is closest to the actual life situation and majority of its life is operating in uniform wear.
D. All of these

66. Past ME Board Question
The life of ball bearing is proportional to the load?
A. square
B. square root
C. cube root
D. cube

67. How do you call a journal bearing whose length to diameter ratio (L/D) is equal to 1 ?

A. Square ball bearing

B. Short roller bearing

C. Medium thrust bearing

D. Tapered bearing

68. The usual recommended bearing life for wheel applications in automobile cars is ——
million
revolutions.

А. 50
B. 100
C. 500
D. 1200

69. Which of the following is the most recommended bearing for work situation where there is oscillation?
A. Needle roller bearing
B. Medium thrust bearing
C. Hydrodynamic bearing
D. Single row ball bearing

70. Most steel ball bearings are made of ____.
A. High carbon chromium steel
B. Mild Steel
C. High speed tool steel
D. Vanadium Steel

71. Which of the following is the type of bearing that has the least coefficient of friction?
A. Thrust ball bearing
В. Sleeve bearing
C. Tapered bearing
D. Plain bearing

72. Which of the following is the type of bearing that can be speed and low load?
used for extremely large surface velocities, very high
A. Needle roller bearing
B. Thrust bearing
C. Oil Sleeve bearing
D. Gas lubricated bearing

73. Past ME Board Question
Which of the following is the most suitable bearing for carrying very heavy loads with slow speed?
A. Roller bearing
B. Hydrostatic bearing
C. Magnetic bearing
D. Spherical roller bearing

74. Past ME Board Question
Which of the following are considered as antifriction - bearings?
A. Roller and ball bearing
B. Hydrostatic bearing
C. Sleeve bearings
D. None of these

75. Which of the following is an example of a positive contact clutch?
A. Square jaw clutch
B. Spiral jaw clutch
C. Toothed clutch
D. All of these

76. These are clutches whose power transmission is achieved by means of magnetic field with many advantages like rapid response time, ease of control and smooth starts and stops?

A. Positive contact clutches

B. Electromagnetic clutches

C. Fluid Clutches

D. Toothed clutches

77. Which of the following is a major type of friction clutch?
A. plate clutch
B. cone clutch
C. centrifugal clutch
D. all of these

78. Which of the following is the best reason why Teflon is used in bearing?
A. It has low coefficient of friction and does not absorb moisture.
B. It quickly dissipates heat.
C. It is most likely suitable for a very small clearance.
D. All of these

79. What type of bearings usually installed in shafts of gear boxes of automobiles?
A. Antifriction bearings
B. Hydrodynamics roller bearings
C. Spherical roller thrust bearings
D. Magnetic bearings

A

81. Which of the following statements is CORRECT for uniform pressure theory?
A. Uniform pressure theory has the same frictional torque as uniform wear theory.
B. Uniform pressure theory has the higher frictional torque as uniform wear theory.
C. Uniform pressure theory has the lower frictional torque as uniform wear theory.
D. None of these

82. What is the tangential stress across the thickness ofa thick walled cylinder?
A. Maximum at the inside while minimum at the outside
B. Maximum at the inside but zero at the outside
C. It is linearly uniform from the inside up to the outside
D. None of these

83. Past ME Board Question
Bearings that were developed for and have excellent record in heavy-duty applications such as aircraft master rod and diesel engine main bearings.
A. Silver Bearings
B. Cast Iron Bearings
C. Aluminum Bearings
D. Flexure Bearings

84. Bearings that are ideally suited for application involving oscillatory motion such as piston pin, bearings, rocker arms, and universal joints.
A. Needle bearings
B. Thrust bearings
C. Deep groove ball bearings
D. Cylindrical roller bearings

85. Past ME Board Question
Which of the following is an example of thick-walled cylinder?
A. Hydraulic cylinders
B. High pressure pipes
C. Barrels
D. All of these

86. Which of the following statements is TRUE about wet clutch?
A. Heat dissipation is easier on the wet clutch in comparison to a dry clutch
В. Wet clutch wears out faster than dry clutch
C. Wet clutch does not use oil to keep the system cool.
D. The engagement of dry clutch is smoother than in the wet clutch

87. Past ME Board Question
Automatic engagement at a pre-determined speed is a characteristic of which clutch?
A. Jaw clutch
B. Conical clutch
C. Flat plate clutch
D. Centrifugal clutch

88. Past ME Board Question
AFBMA is an acronym for the association involved what machine elements?
A. Ball and roller bearings
B. Journal bearings
B. Flat and V belts
D. Threaded members

89. Past ME Board Question
Which of the following is the type of bearing that best able to carry axial thrust?
A. plane journal bearing
B. ball bearing
C. needle bearing
D. tapered roller bearing

90. The main cause of the failure of antifriction bearings is ____.
A. Pitting
B. Scoring
C. Abrasion
D. Any of these

91. Past ME Board Question
A pressure vessel is classified as thin-walled if the thickness to inside diameter is less than or equal to which of the following?
A. 0.1
B. 0.01
C. 10
D. 1/16

92. Which of the following statements is CORRECT
hydrodynamic lubricated bearing?

A. hydrodynamic lubricated bearing has a very thin film of lubricant between journal and bearing.

B. hydrodynamic lubricated bearing has a thick film of lubricant between journal and bearing.

C. hydrodynamic lubricated bearing has no lubricant between journal and bearing.

D. Intermittent load is supported without any relative motion between the journal and the bearing

93. When the material of a thick walled cylinder is brittle, such as iron and cast steel, which of the following is used to determine its thickness?
A. Bernies Equation
B. Clavarino's equation
C. St. Venant's equation
D. Lame's Equation

94. Which of the following is the basis in the analysis for
NEW clutches installed in the system?

A. Uniform pressure theory

B. Uniform wear theory

C. Universal friction theory

D. Any of these

95. Past ME Board Question
In radial bearings, the load acts rotation.
to the axis of
A. parallel
B. inclined
C. perpendicular
D. isotropically

96. Past ME Board Question
How do you call the stress induced in the balls or rollers of the rolling contact bearing?
A. contact stress
B. torsional stress
C. tangential stress
D. girth stress

97. Past ME Board Question
What is the other name for Conrad bearing?
A. Ball bearing
B. Needle bearing
C. Roller bearing
D. Tapered bearing

98. Past ME Board Question
It is a mechanical device used to connect or disconnect the source of power from the remaining parts of power transmission system on the basis of operator's control.
A. Clutch
B. Gear
C. Belt
D. Shaft

99. In the case of high pressure cylinders and gun barrels, how do you call the process of prestressing the cylinder before using ?
A. Autofrettage
B. Firing
C. Impact testing
D. Izod Testing

100. Past ME Board Question
What is the meaning of the catalog life of bearing?
A. The minimum life that 90% of the bearings will reach or exceed
B. Maximum life of the 90% of the bearings.
C. Economic life of the bearings
D. Median life of the bearings