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.

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16.
Tensile strength of a mild steel specimen can be roughly predicted from following hardness test_________________?

Brinell

Rockwell

Vicker

Shore’s sceleroscope

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17.
Rankine’s theory of failure is applicable for following type of materials___________________?

Brittle

Ductile

Elastic

Plastic

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18.
A hot short metal is_________________?

Brittle when cold

Brittle when hot

Brittle under all conditions

Ductile at high temperature

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19.
The permissible stress for carbon steel under static loading is generally taken as__________________?

2000-3000 kg/pm2

3000-4000 kg/cm2

4000-4500 kg/cm2

7500-10,000 kg/cm2

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20.
The ultimate strength of steel in tension in comparison to shear is in the ratio of__________________?

1 : l

2:1

3 : 2

2 : 3

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21.
The fatigue limit of a material____________________?

Is greatly decreased by poor surface conditions

Remains same irrespective of surface conditions

Depends mainly on core composition

Is dependent upon yield strength of material

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22.
Yield point in fatigue loading as compared to static loading is__________________?

Same

Higher

Lower

Depends on other factors

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23.
The building up of worn and uridersized parts, subjected to repeated loads by electroplating is_____________________?

Best method

Extremely hazardous

Has no effect as regards fatigue strength

Cheapest method

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24.
Which process will increase the fatigue duration of parts ?

Finishing and polishing

Shot-peening

Decarburisation

Electroplating

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25.
In nitrated parts, the origins of the fatigue cracks will occur at__________________?

Surface

Just below the surface

Within the core

Could occur anywhere

None of the above

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26.
Cold working________________?

Increases the fatigue strength

Decreases the fatigue strength

Has no influence on fatigue strength

Alone has no influence on fatigue strength

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27.
Residual stress in materials_________________?

Acts when external load is applied

Becomes zero when external load is removed

Is independent of external loads

Is always harmful

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28.
The ratio of endurance limit in shear to the endurance limit in flexure is__________________________?

0.33

0.4

0.5

0.55

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29.
Resistance to fatigue of a material is measured by________________?

Young’s modulus

Coefficient of elasticity

Elastic limit

Ultimate tensile strength

Endurance limit

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30.
For steel, the ultimate strength in shear as compared to ultimate strength in tension is ___________________?

Same

1/2

1/3

1/4

2/3

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