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

Resilience of a material is important, when it is subjected to________________?

A. combined loading
B. fatigue
C. thermal stresses
D. wear and tear

Other method of reducing shock load in the above case can be_________________?

A. To decrease length
B. To increase length
C. Unaffected by length
D. Other factors would decide same

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

The endurance limit of a material with finished surface in comparison to rough surface is_________________?

A. More
B. Less
C. Same
D. More or less depending on quantum of load

The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be_________________?

A. Same in both cases
B. 2 times more
C. 3 times more
D. 4 times more

Stress concentration in static loading is more serious in__________________?

A. Ductile materials
B. Brittle materials
C. Equally serious in both cases
D. Depends on other factors

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

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

A. Cold working
B. Shot peening
C. Surface decarburisation
D. Under-stressing

Stress concentration in static loading is_________________?

WhiCh is correct statement ?


D. None of these