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

Which process will increase the fatigue duration of parts ?

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

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

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

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

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

Resistance to fatigue of a material is measured by________________?

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

For steel, the ultimate strength in shear as compared to ultimate strength in tension is ___________________?

A. same
B. 1/2
C. 1/3
D. 1/4

At low temperatures (say 75°C) the notched-bar impact value of steel____________________?

A. Increases markedly
B. Decreases markedly
C. Remains same
D. Depends on heat treatment carried out

The crest diameter of a screw thread is same as _____________________?

A. Major diameter
B. Minor diameter
C. Pitch diameter
D. Core diameter