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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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.

In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by_________________?

A decreasing the cross-section area of’ bar

B increasing the cross-section area of bar

C remain unaffected with cross-section area

D would depend upon other factors

Review Detailed Answer

Correct Answer: decreasing the cross-section area of’ bar

If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?

A be independent of ratio of mass of load W to mass of bar (y)

B increase with increase in y

C decrease with decrease in y

D depend on other considerations

Review Detailed Answer

Correct Answer: be independent of ratio of mass of load W to mass of bar (y)

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

Correct Answer: ductile materials

Fatigue strength can be increased by__________________?

A cold working

B shot peening

C grinding and lapping surface

D hot working

Review Detailed Answer

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

Review Detailed Answer

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°

Review Detailed Answer

Correct Answer: 45°

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

A 40°

B 122°

C 136°

D 152°

Review Detailed Answer

Correct Answer: 136°

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by_________________?

If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?

Stress concentration is caused due to_____________________?

Plastic flow in ductile materials_____________________?

The fatigue life of a part can be improved by_____________________?

Stress concentration in cyclic loading is more serious in__________________?

Fatigue strength can be increased by__________________?

Coaxing is the procedure of increasing__________________?

The notch angle of the Izod impact test specimen is________________?

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