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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

Stress concentration is caused due to_____________________?
A variation in properties of material from point to point in a member
B pitting at’points or areas at which loads on a member are applied
C abrupt change of section
D all of the above
Correct Answer: all of the above
Plastic flow in ductile materials_____________________?
A increases the seriousness of static load-ing stress concentration
B lessens the seriousness of static load¬ing stress concentration
C has no effect on it
D depends on other considerations
Correct Answer: lessens the seriousness of static load¬ing stress concentration
The fatigue life of a part can be improved by_____________________?
A electroplating
B polishing
C coating
D shot peening
Correct Answer: shot peening
Stress concentration in cyclic loading is more serious in__________________?
A ductile materials
B brittle materials
C equally serious in both cases
D depends on other factors
Correct Answer: ductile materials
Fatigue strength can be increased by__________________?
A cold working
B shot peening
C grinding and lapping surface
D hot working
Correct Answer: hot working
Coaxing is the procedure of increasing__________________?
A metal strength by cycling
B metal hardness by surface treatment
C metal resistance to corrosion by coating
D fatigue limit by overstressing the metal by successively increasing loadings
Correct Answer: fatigue limit by overstressing the metal by successively increasing loadings
The notch angle of the Izod impact test specimen is________________?
A 10°
B 20°
C 30°
D 45°
Correct Answer: 45°
In Vicker’s hardness testing, the pyramid indentor apex is__________________?
A 40°
B 122°
C 136°
D 152°
Correct Answer: 136°
If a material fails below its yield point, failure would be due to___________________?
A straining
B fatigue
C creep
D sudden loading
Correct Answer: fatigue
Stress concentration in cyclic loading is____________________?
A very serious in brittle materials and less serious in ductile materials
B very serious in ductile materials and less serious in brittle materials
C equally serious in both types of materials
D seriousness would depend on other factors
Correct Answer: equally serious in both types of materials
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