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Machine Design - Interview Questions and Answers

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131. Split 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 in middle of nut and then slot reduced by tightening screw
C. a hard fibre 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 splitted and bent in reverse direction at the other end
E. none of the above.
Explanation:
132. A bench vice has following type of threads
A. metric
B. square
C. buttress
D. acme
E. BSW.
Explanation:
133. For tight leakage joints, following type of thread is best suited
A. metric
B. buttress
C. square
D. acme
E. NPT (national pipe threads).
Explanation:
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