Machine Design Mcqs

This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Machine Design ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Machine Design comprehensively.

1.
Which of the following is not correct procedure to increase the fatigue limit_______________?

Cold working

Shot peening

Surface decarburisation

Under-stressing

2.
Stress concentration in static loading is_________________?

Which is correct statement ?

very serious in brittle materials and less serious in ductile materials

very serious in ductile materials and less serious in brittle materials

seriousness would depend on other factors

equally serious in both types of materials

none of the above

3.
Stress concentration in cyclic loading is____________________?

Ch is correct statement ?

Very serious in brittle materials and less serious in ductile materials

Very serious in ductile materials and less serious in brittle materials

Equally serious in both types of materials

4.
If a material fails below its yield point, failure would be due to___________________?

Straining

Fatigue

Creep

Sudden loading

5.
In Vicker’s hardness testing, the pyramid indentor apex is__________________?

40°

122°

136°

152°

6.
In testing a material for endurance strength, it is subjected to_______________________?

Static load

Dynamic load

Impact load

Static as well as dynamic load

Completely reversed load

8.
Coaxing is the procedure of increasing__________________?

Metal strength by cycling

Metal hardness by surface treatment

Metal resistance to corrosion by coating

Fatigue limit by overstressing the metal by successively increasing loadings

9.
Fatigue strength can be increased by__________________?

Cold working

Shot peening

Grinding and lapping surface

Hot working

10.
Stress concentration in cyclic loading is more serious in__________________?

Ductile materials

Brittle materials

Equally serious in both cases

Depends on other factors

11.
The fatigue life of a part can be improved by_____________________?

Electroplating

Polishing

Coating

Shot peening

12.
Plastic flow in ductile materials_____________________?

Increases the seriousness of static load-ing stress concentration

Lessens the seriousness of static load¬ing stress concentration

Has no effect on it

Depends on other considerations

13.
Stress concentration is caused due to_____________________?

Variation in properties of material from point to point in a member

Pitting at’points or areas at which loads on a member are applied

Abrupt change of section

All of the above

14.
If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?

Be independent of ratio of mass of load W to mass of bar (y)

Increase with increase in y

Decrease with decrease in y

Depend on other considerations

15.
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_________________?

Decreasing the cross-section area of’ bar

Increasing the cross-section area of bar

Remain unaffected with cross-section area

Would depend upon other factors

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