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

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cgrinding the shank

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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

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Allen bolts are___________________?


aself locking bolts

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bdesigned for shock load

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cused in aircraft application

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dprovided with hexagonal depression in head

✓



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


a18

✓


b16

✖


c20

✖


d22

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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

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bdirection of twist of wires and strands are same

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cwires in two adjacent strands are twisted in opposite direction

✓


dwires are not twisted

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Basic shaft is one__________________?


awhose upper deviation is zero

✓


bwhose lower deviation is zero

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cwhose lower as well as upper deviations are zero

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ddoes not exist

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Whether any core is required in wire ropes________________?


ayes

✓


bno

✖


csometimes

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drarely

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View Answer yes

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


a5°

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b8°

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c15°

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d25°

✓


View Answer 25°

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