Mechanical Engineering MCQs

Page No. 98

Which of the following is not correct procedure to increase the fatigue limit_______________?


acold working


bshot peening


csurface decarburisation


dunder-stressing



Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to________________?


adynamic loading


bstatic loading


ccombined static and dynamic loading


dcompletely reversed loading



Stress concentration in static loading is more serious in__________________?


aductile materials


bbrittle materials


cequally serious in both cases


ddepends on other factors


View Answer brittle materials

The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be_________________?


asame in both cases


b2 times more


c3 times more


d4 times more


View Answer 3 times more

The endurance limit of a material with finished surface in comparison to rough surface is_________________?


amore


bless


csame


dmore or less depending on quantum of load


View Answer more

Brittle coating technique is used for_________________?


adetermining brittleness


bprotecting metal against corrosion


cprotecting metal against wear and tear


dexperimental stress analysis



Other method of reducing shock load in the above case can be_________________?


ato decrease length


bto increase length


cunaffected by length


dother factors would decide same


View Answer to increase length

Resilience of a material is important, when it is subjected to________________?


acombined loading


bfatigue


cthermal stresses


dshock loading


View Answer shock loading

If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as follows______________________?


avpE


bvVvF


cWpE/2


dIvHpE


View Answer vpE

Guest’s theory of failure is applicable for following type of materials_________________?


abrittle


bductile


celastic


dplastic


View Answer ductile

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