Mechanical Engineering MCQs

Page No. 89

The connecting rod bolts are tightened up with initial tension greater than the external load so that___________________?


ajoint may not open up


bbolts are weakest elements


cthe resultant load on the bolt would not be affected by the external cyclic load


dbolts will not loosen during service



The shock absorbing capacity of a bolt can be increased by___________________?


atightening it properly


bincreasing shank diameter


cgrinding the shank


dmaking shank diameter equal to core diameter of thread



If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited ________________?


asquare


bacme


cbuttress


dBSW


View Answer buttress

The connecting rod bolts are tightened up so that tightening stress _________________?


ais just sufficient to hold parts together


bapproaches yield point


cis 50% of yield point


dis about yield point divided by safety factor



Allen bolts are___________________?


aself locking bolts


bdesigned for shock load


cused in aircraft application


dprovided with hexagonal depression in head



I.S. specifies following total number of grades of tolerances__________________?


a18


b16


c20


d22


View Answer 18

In composite or reverse laid ropes___________________?


adirection of twist of wires in strands is opposite to the direction of twist of strands


bdirection of twist of wires and strands are same


cwires in two adjacent strands are twisted in opposite direction


dwires are not twisted



Basic shaft is one__________________?


awhose upper deviation is zero


bwhose lower deviation is zero


cwhose lower as well as upper deviations are zero


ddoes not exist



Whether any core is required in wire ropes________________?


ayes


bno


csometimes


drarely


View Answer yes

In standard taper roller bearings, the angle of taper of outer raceway is___________________?


a


b


c15°


d25°


View Answer 25°

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