Design of Machine Elements

Q.  Elastic nut is a locking device in which__________________?

a. one small 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 a screw
c. hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed 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 a
e. none of the above


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