Mechanical Engineering MCQs

Page No. 97

The fatigue life of a part can be improved by_____________________?


aelectroplating

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bpolishing

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ccoating

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dshot peening

✓


View Answer shot peening

Stress concentration in cyclic loading is more serious in__________________?


aductile materials

✓


bbrittle materials

✖


cequally serious in both cases

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ddepends on other factors

✖


View Answer ductile materials

Fatigue strength can be increased by__________________?


acold working

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bshot peening

✖


cgrinding and lapping surface

✖


dhot working

✓


View Answer hot working

Coaxing is the procedure of increasing__________________?


ametal strength by cycling

✖


bmetal hardness by surface treatment

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cmetal resistance to corrosion by coating

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dfatigue limit by overstressing the metal by successively increasing loadings

✓



The notch angle of the Izod impact test specimen is________________?


a10°

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b20°

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c30°

✖


d45°

✓


View Answer 45°

In testing a material for endurance strength, it is subjected to_______________________?


astatic load

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bdynamic load

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cimpact load

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dcompletely reversed load

✓



In Vicker’s hardness testing, the pyramid indentor apex is__________________?


a40°

✖


b122°

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c136°

✓


d152°

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View Answer 136°

If a material fails below its yield point, failure would be due to___________________?


astraining

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bfatigue

✓


ccreep

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dsudden loading

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View Answer fatigue

Stress concentration in cyclic loading is____________________? Which is correct statement ?


avery serious in brittle materials and less serious in ductile materials

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bvery serious in ductile materials and less serious in brittle materials

✖


cequally serious in both types of materials

✓


dseriousness would depend on other factors

✖



Stress concentration in static loading is_________________? Which is correct statement ?


avery serious in brittle materials and less serious in ductile materials

✓


bvery serious in ductile materials and less serious in brittle materials

✖


cequally serious in both types of materials

✖


dseriousness would depend on other factors

✖



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