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46. 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

E. none of the above.

Explanation:

47. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

A. dynamic loading

B. static loading

C. combined static and dynamic loading

D. completely reversed loading

E. all of the above.

Explanation:

48. Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

A. Brinell

B. Rockwell

C. Vicker

D. Shore's sceleroscope

E. none of the above.

Explanation:

49. Brittle coating technique is used for

A. determining brittleness

B. protecting metal against corrosion

C. protecting metal against wear and tear

D. experimental stress analysis

E. non-destructive testing of metals.

Explanation:

50. The fatigue life of a part can be improved by

A. electroplating

B. polishing

C. coating

D. shot peening

E. heat treating.

Explanation:

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