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

If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?

A. Be independent of ratio of mass of load w to mass of bar (y)
B. Increase with increase in y
C. Decrease with decrease in y
D. Depend on other considerations

In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by_________________?

A. Decreasing the cross-section area of’ bar
B. Increasing the cross-section area of bar
C. Remain unaffected with cross-section area
D. Would depend upon other factors

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

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

A. Brittle
B. Ductile
C. Elastic
D. Plastic

A hot short metal is_________________?

A. Brittle when cold
B. Brittle when hot
C. Brittle under all conditions
D. Ductile at high temperature

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

A. 2000-3000 kg/pm2
B. 3000-4000 kg/cm2
C. 4000-4500 kg/cm2
D. 7500-10,000 kg/cm2

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

A. 1 : l
B. 2:1
C. 3 : 2
D. 2 : 3

The fatigue limit of a material____________________?

A. Is greatly decreased by poor surface conditions
B. Remains same irrespective of surface conditions
C. Depends mainly on core composition
D. Is dependent upon yield strength of material

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

A. Same
B. Higher
C. Lower
D. Depends on other factors