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Machine Design - Interview Questions and Answers

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41. Plastic flow in ductile materials
A. increases the seriousness of static loading stress concentration
B. lessens the seriousness of static loading stress concentration
C. has no effect on it
D. depends on other considerations
E. none of the above.
Explanation:
42. A hot short metal is
A. brittle when cold
B. brittle when hot
C. brittle under all conditions
D. ductile at high temperature
E. hard when hot.
Explanation:
43. If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as follows
A. vpE
B. vVvF
C. WpE/2
D. IvHpE
E. none of the above, where E = modulus of elasticity and p = mass density.
Explanation:
44. 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
E. none of the above.
Explanation:
45. 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
E. unpredictable.
Explanation:
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