Mechanical Engineering MCQs

Page No. 88

If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?


aZN/p

✓


bp/ZN

✖


cZ/pN

✖


dN/Zp

✖


View Answer ZN/p

In hydrostatic bearings ____________________?


athe Oil film pressure is generated only by the rotation of the journal

✖


bthe oil film is maintained by supplying oil under pressure

✓


cdo not require external supply of lubricant

✖


dgrease is used for lubrication

✖



The rated life of a bearing varies___________________?


adirectly as load

✖


binversely as square of load

✖


cinversely as cube of load

✓


dinversely as fourth power of load

✖



In V-belt drive, belt touches______________?


aat bottom

✖


bat sides only

✓


cboth at bottom and sides

✖


dcould touch anywhere

✖


View Answer at sides only

In cross or regular lay 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

✖



If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to___________________?


adiameter of bolt

✓


b0.75 x diameter of bolt

✖


c1.25 x diameter of bolt

✖


d1.5 x diameter of bolt

✖


View Answer diameter of bolt

Basic hole is one_________________?


awhose upper deviation is zero

✖


bwhose lower deviation is zero

✓


cwhose lower as well as upper deviations are zero

✖


ddoes not exist

✖



For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately________________?


a0.4 times

✓


b0.6 times

✖


c0.7 times

✖


d0.8 times

✖


View Answer 0.4 times

The resultant axial load on a bolt depends on_______________?


ainitial tension

✖


bexternal load applied

✖


crelative elastic yielding (springness) of the bolt and the connected member

✖


dA, B. and C. above

✓


View Answer A, B. and C. above

When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at_______________?


ashank

✖


bhead

✖


cin the middle

✖


dat the thread

✓


View Answer at the thread

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