Resistance to fatigue of a material is measured by________________?

A. young’s modulus
B. coefficient of elasticity
C. elastic limit
D. ultimate tensile strength

The ratio of endurance limit in shear to the endurance limit in flexure is__________________________?

A. 0.33
B. 0.4
C. 0.5
D. 0.55

Residual stress in materials_________________?

A. Acts when external load is applied
B. Becomes zero when external load is removed
C. Is independent of external loads
D. Is always harmful

Cold working________________?

A. Increases the fatigue strength
B. Decreases the fatigue strength
C. Has no influence on fatigue strength
D. Alone has no influence on fatigue strength

In nitrated parts, the origins of the fatigue cracks will occur at__________________?

A. surface
B. just below the surface
C. within the core
D. could occur anywhere

Which process will increase the fatigue duration of parts ?

A. Finishing and polishing
B. Shot-peening
C. Decarburisation
D. Electroplating

The building up of worn and uridersized parts, subjected to repeated loads by electroplating is_____________________?

A. Best method
B. Extremely hazardous
C. Has no effect as regards fatigue strength
D. Cheapest method

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

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

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

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