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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