machine design MCQs – Page 4

Practise focused machine design questions with marked answers for exam preparation and subject revision.

machine design Mcqs

61. Fibrous fracture occurs in_____________?
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A. hard material

B. brittle material

C. ductile material

D. elastic material

E. all of the above

62. Which of the following pipe joints would be suitable for pipes carrying steam_____________?
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A. threaded

B. flanged

C. compression

D. expansion

E. bell and spigot

63. Other method of reducing shock load in the above case can be_________________?
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A. unaffected by length

B. to increase length

C. none of the above

D. to decrease length

E. other factors would decide same

64. Plastic flow in ductile materials_____________________?
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A. depends on other considerations

B. lessens the seriousness of static loading stress concentration

C. none of the above

D. increases the seriousness of static load-ing stress concentration

E. has no effect on it

65. Turn buckle has____________________?
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A. right hand threads on bout ends

B. left hand threads on both ends

C. left hand threads on one end and right hand threads on other end

D. no threads

E. threads in middle portion

66. Belt slip may occur due to________________?
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A. loose belt

B. driving pulley too small

C. all of the above

D. none of the above

E. heavy load

67. Stress concentration in cyclic loading is____________________?
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A. ch is correct statement ?

B. very serious in brittle materials and less serious in ductile materials

C. very serious in ductile materials and less serious in brittle materials

D. equally serious in both types of materials

E. seriousness would depend on other factors

F. none of the above

68. A bolt___________________?
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A. has a head on one end and a nut fitted to the other

B. has head at one end and other end fits into a tapped hole in the other part to be joined

C. has both the ends threaded

D. is provided with pointed threads

E. requires no nut

69. Castle nut is a locking device in which__________________?
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A. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

B. a slot is cut partly is middle of nut and then slot reduced by tightening a screw

C. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

D. through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

E. none of the above.

70. Gear box is used___________________?
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A. to obtain variable speeds

B. for speed reduction

C. to damp out vibrations

D. to increase efficiency of system

E. to produce torque

71. A key made from a cylindrical disc having segmental cross-section, is known as______________?
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A. feather key

B. hollow saddle key

C. flat saddle key

D. gib head key

E. wood-ruff key

72. Brittle coating technique is used for_________________?
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A. protecting metal against corrosion

B. determining brittleness

C. protecting metal against wear and tear

D. non-destructive testing of metals

E. experimental stress analysis

73. For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately________________?
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A. 0.7 times

B. 0.8 times

C. 0.4 times

D. 0.6 times

E. 0.9 times the normal diameter of bolt

74. Form coefficient of spring is _____________________?
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A. load required to produce unit deflection

B. its capability of storing energy

C. concerned With strength of wire of spring

D. ratio of coil diameter to wire diameter

E. nothing

75. Ball bearing type screws are found in following application_____________________?
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A. aeroplane engines

B. bench vice

C. steering mechanism

D. crane

E. screw jack

76. The shock absorbing capacity of a bolt can be increased by___________________?
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A. tightening it properly

B. grinding the shank

C. making shank diameter equal to core diameter of thread

D. increasing shank diameter

E. using washer

77. The property of a material which enables it to resist fracture due to high impact loads is known as__________________?
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A. endurance

B. strength

C. elasticity

D. toughness

E. resilience

78. Cap screws are___________________?
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A. slotted for a screw driver and generally used with a nut

B. similar to stud

C. used to prevent relative motion be-tween parts

D. similar tosmall size tap bolts except that a greater variety of shapes of heads are available

E. provided with detachable caps

79. The building up of worn and uridersized parts, subjected to repeated loads by electroplating is_____________________?
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A. best method

B. extremely hazardous

C. cheapest method

D. has no effect as regards fatigue strength

E. all of the above

80. When a close coiled helical spring is compressed, its wire is subjected to________________?
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A. shear

B. compression

C. all of the above

D. tension

E. none of the above

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