Stress concentration in cyclic loading is____________________? Which is correct statement ?

A. Very serious in brittle materials and less serious in ductile materials
B. Very serious in ductile materials and less serious in brittle materials
C. Equally serious in both types of materials
D. Seriousness would depend on other factors

If a material fails below its yield point, failure would be due to___________________?

A. Straining
B. Fatigue
C. Creep
D. Sudden loading

In Vicker’s hardness testing, the pyramid indentor apex is__________________?

A. 40°
B. 122°
C. 136°
D. 152°

In testing a material for endurance strength, it is subjected to_______________________?

A. static load
B. dynamic load
C. impact load
D. static as well as dynamic load

The notch angle of the Izod impact test specimen is________________?

A. 10°
B. 20°
C. 30°
D. 45°

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

Fatigue strength can be increased by__________________?

A. Cold working
B. Shot peening
C. Grinding and lapping surface
D. Hot working

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

The fatigue life of a part can be improved by_____________________?

A. Electroplating
B. Polishing
C. Coating
D. Shot peening

Plastic flow in ductile materials_____________________?

A. Increases the seriousness of static load-ing stress concentration
B. Lessens the seriousness of static load¬ing stress concentration
C. Has no effect on it
D. Depends on other considerations