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55.

Coaxing is the procedure of increasing                        
A. metal strength by cycling B. metal hardness by surface treatment
C. metal resistance to corrosion by coating D. fatigue limit by overstressing the metal by successively increasing loadings



56.

Cold working                        
A. increases the fatigue strength B. decreases the fatigue strength
C. has no influence on fatigue strength D. alone has no influence on fatigue strength



57.

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. har4 fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is srewed 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 other end




58.

Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to                        
A. dynamic loading B. static loading
C. combined static and dynamic loading D. completely reversed loading



59.

Fibrous fracture occurs in                        
A. ductile material B. brittle material
C. elastic material D. hard material



60.

For applications involving high stresses in one direction only the following type of thread would be best suited                        
A. ISO metric thread B. acme thread
C. square thread D. buttress thread



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