machine design MCQs – Page 6

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

machine design Mcqs

101. A hot short metal is_________________?
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A. ductile at high temperature

B. hard when hot

C. brittle when cold

D. brittle when hot

E. brittle under all conditions

102. A tube has the following advantage over pipe_________________?
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A. none of the above

B. greater shock absorption

C. smoother inside walls

D. all of the above

E. lighter and easier to handle

103. Aircraft body is usually fabricated by_________________?
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A. casting

B. precasting

C. rivetting

D. unconventional methods

E. welding

104. Residual stress in materials_________________?
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A. becomes zero when external load is removed

B. acts when external load is applied

C. is independent of external loads

D. is always harmful

E. is always beneficial

105. Basic shaft is one__________________?
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A. whose lower as well as upper deviations are zero

B. whose lower deviation is zero

C. does not exist

D. whose upper deviation is zero

E. none of the above

106. A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as___________________?
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A. flat saddle key

B. gib head key

C. hollow saddle key

D. feather key

E. wood-ruff key

107. The ultimate strength of steel in tension in comparison to shear is in the ratio of__________________?
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A. 1:02

B. 1 : l

C. 2:03

D. 3 : 2

E. 2:01

108. A bench vice has following type of threads____________________?
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A. BSW

B. metric

C. square

D. buttress

E. acme

109. Maximum principal stress theory is applicable for_____________________?
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A. elastic materials

B. ductile materials

C. all of the above

D. brittle materials

E. none of the above

110. Set screws are_________________?
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A. none of the above

B. slotted for a screw driver and generally used with a nut

C. similar to small size tap bolts except that a greater variety of shapes of heads are available

D. used to prevent relative motion be-tween parts

E. similar to stud

111. If a material fails below its yield point, failure would be due to___________________?
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A. straining

B. sudden loading

C. creep

D. fatigue

E. impact loading

112. Split nut is a locking device in which_________________?
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A. a slot is cut partly in middle of nut and then slot reduced by tightening screw

B. 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

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

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

E. none of the above

113. For applications involving high stresses in one direction only the following type of thread would be best suited______________________?
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A. ISO metric thread

B. buttress thread

C. square thread

D. acme thread

E. British Association thread

114. In hydrodynamic bearings_____________________?
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A. do not require external supply of lubricant

B. grease is used for lubrication

C. none of the above

D. the oil film is maintained by supplying oil under pressure

E. the oil film pressure is generated only by the rotation of the journal

115. Allen bolts are___________________?
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A. self locking bolts

B. provided with hexagonal depression in head

C. designed for shock load

D. used in aircraft application

E. uniform strength bolts

116. The notch angle of the Izod impact test specimen is________________?
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A. 10

B. 20

C. 60.

D. 45

E. 30

117. The function of cutting oil when threading a pipe is to___________________?
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A. provide cooling action

B. help remove chips

C. all of the above

D. none of the above

E. lubricate the dies

118. The function of a washer is to___________________?
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A. provide bearing area

B. provide cushioning effect

C. absorb shocks and vibrations

D. provide smooth surface in place of rough surface

E. act as a locking device

119. The rated life of a bearing varies___________________?
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A. directly as load

B. inversely as cube of load

C. inversely as fourth power of load

D. none of the above

E. inversely as square of load

120. The piston rod of a steam engine is usually connected to the cross head by means of__________________?
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A. universal joint

B. cotter joint

C. bolted joint

D. universal coupling

E. kunckle joint

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