Mechanical Engineering MCQs

Page No. 97

The fatigue life of a part can be improved by_____________________?


aelectroplating


bpolishing


ccoating


dshot peening


View Answer shot peening

Stress concentration in cyclic loading is more serious in__________________?


aductile materials


bbrittle materials


cequally serious in both cases


ddepends on other factors


View Answer ductile materials

Fatigue strength can be increased by__________________?


acold working


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


cmetal resistance to corrosion by coating


dfatigue limit by overstressing the metal by successively increasing loadings



The notch angle of the Izod impact test specimen is________________?


a10°


b20°


c30°


d45°


View Answer 45°

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


astatic load


bdynamic load


cimpact load


dcompletely reversed load



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


a40°


b122°


c136°


d152°


View Answer 136°

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


astraining


bfatigue


ccreep


dsudden loading


View Answer fatigue

Stress concentration in cyclic 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



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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