Fatigue strength can be increased by__________________?
(A) cold working
(B) shot peening
(C) grinding and lapping surface
(D) hot working
(D) using gradual changes of section
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
(D) none of the above
The notch angle of the Izod impact test specimen is________________?
(A) 10°
(B) 20°
(C) 30°
(D) 45°
(D) 60°.
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
(D) completely reversed load
In Vicker’s hardness testing, the pyramid indentor apex is__________________?
(A) 40°
(B) 122°
(C) 136°
(D) 152°
(D) 161°.
If a material fails below its yield point, failure would be due to___________________?
(A) straining
(B) fatigue
(C) creep
(D) sudden loading
(D) impact loading
Stress concentration in cyclic loading is____________________?
(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
(D) none of the above
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
(D) all of the above
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
(D) 1 : 2
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
(D) 10,000-15,000 kg/cm2