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Machine Design - Interview Questions and Answers

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111. Castle nut is a locking device in which
A. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B. a slot is cut partly is middle of nut and then slot reduced by tightening a screw
C. 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
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.
Explanation:
112. .Other method of reducing shock load in the above case can be
A. to decrease length
B. to increase length
C. unaffected by length
D. other factors would decide same
E. none of the above.
Explanation:
113. Taper on the cotter and slot is provided
A. on both the sides
B. on one side only
C. on none of the sides
D. may be provided anywhere
E. none of the above.
Explanation:
114. A tube has the following advantage over pipe
A. lighter and easier to handle
B. greater shock absorption
C. smoother inside walls
D. all of the above
E. none of the above.
Explanation:
115. The piston rod of a steam engine is usually connected to the cross head by means of
A. bolted joint
B. knuckle joint
C. cotter joint
D. universal joint
E. universal coupling.
Explanation:
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