Category: Machine Design

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
E. none of the above

A. brittle
B. ductile
C. elastic
D. plastic
E. tough

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 at other end
E. none of the above

A. has a head on one end and a nut fitted to the other
B. has head at one end and other end fits into a tapped hole in the other part to be joined
C. has both the ends threaded
D. is provided with pointed threads
E. requires no nut

A. decreasing the cross-section area of’ bar
B. increasing the cross-section area of bar
C. remain unaffected with cross-section area
D. would depend upon other factors
E. none of the above

A. ductile materials
B. brittle materials
C. equally serious in both cases
D. depends on other factors
E. unpredictable

A. brittle when cold
B. brittle when hot
C. brittle under all conditions
D. ductile at high temperature
E. hard when hot

A. cold working
B. shot peening
C. grinding and lapping surface
D. hot working
E. using gradual changes of section

A. same
B. higher
C. lower
D. depends on other factors
E. none of the above

A. ductile materials
B. brittle materials
C. equally serious in both cases
D. depends on other factors
E. unpredictable