Machine Design MCQs

Question 1

In Vicker's hardness testing, the pyramid indentor apex is

Accepted Answer

136°

Answer

40°

Answer

122°

Answer

152°

Question 2

In testing a material for endurance strength, it is subjected to

Accepted Answer

Completely reversed load

Answer

Static load

Answer

Impact load

Answer

Static as well as dynamic load

Question 3

The fatigue limit of a material

Accepted Answer

Is greatly decreased by poor surface conditions

Answer

Remains same irrespective of surface conditions

Answer

Depends mainly on core composition is dependent upon yield strength of material

Answer

None of the above

Question 4

In nitrided parts, the origins of the fatigue cracks will occur at

Accepted Answer

None of the above

Answer

Surface

Answer

Within the core

Answer

Could occur anywhere

Question 5

Which process will increase the fatigue duration of parts?

Accepted Answer

Shot-peening

Answer

Finishing and polishing

Answer

Decarburisation

Answer

Electroplating

Question 6

Resistance to fatigue of a material is measured by

Accepted Answer

Endurance limit

Answer

Young's modulus

Answer

Elastic limit

Answer

Ultimate tensile strength

Question 7

For steel, the ultimate strength in shear as compared to ultimate strength in tension is

Accepted Answer

3-Feb

Answer

Same

Answer

1/3

Answer

1/4

Question 8

The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

Accepted Answer

0.75

Answer

0.25

Answer

0.55

Answer

0.65

Question 9

At low temperatures (say 75°C) the notched-bar impact value of steel

Accepted Answer

Decreases markedly

Answer

Increases markedly

Answer

Remains same

Answer

Depends on heat treatment carried out