Mechanical Engineering MCQs

Page No. 98

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


acold working

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bshot peening

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csurface decarburisation

✓


dunder-stressing

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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

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bstatic loading

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ccombined static and dynamic loading

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dcompletely reversed loading

✓



Stress concentration in static loading is more serious in__________________?


aductile materials

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bbrittle materials

✓


cequally serious in both cases

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ddepends on other factors

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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

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b2 times more

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c3 times more

✓


d4 times more

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View Answer 3 times more

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


amore

✓


bless

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csame

✖


dmore or less depending on quantum of load

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View Answer more

Brittle coating technique is used for_________________?


adetermining brittleness

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bprotecting metal against corrosion

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cprotecting metal against wear and tear

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dexperimental stress analysis

✓



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


ato decrease length

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bto increase length

✓


cunaffected by length

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dother factors would decide same

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View Answer to increase length

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


acombined loading

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bfatigue

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cthermal stresses

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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

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cWpE/2

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dIvHpE

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View Answer vpE

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


abrittle

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bductile

✓


celastic

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dplastic

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View Answer ductile

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