A. 0.33
B. 0.4
C. 0.5
D. 0.55
E. 0.6
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
E. is always beneficial
Residual stress in materials_________________? Read More »
Machine Design 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
E. none of the above
Cold working________________? Read More »
Machine Design A. surface
B. just below the surface
C. within the core
D. could occur anywhere
E. none of the above
In nitrated parts, the origins of the fatigue cracks will occur at__________________? Read More »
Machine Design A. finishing and polishing
B. shot-peening
C. decarburisation
D. electroplating
E. all of the above”.
Which process will increase the fatigue duration of parts ? Read More »
Machine Design A. best method
B. extremely hazardous
C. has no effect as regards fatigue strength
D. cheapest method
E. all of the above
A. same
B. higher
C. lower
D. depends on other factors
E. none of the above
Yield point in fatigue loading as compared to static loading is__________________? Read More »
Machine Design 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
E. none of the above
The fatigue limit of a material____________________? Read More »
Machine Design A. 1 : l
B. 2:1
C. 3 : 2
D. 2 : 3
E. 1 : 2
A. 2000-3000 kg/pm2
B. 3000-4000 kg/cm2
C. 4000-4500 kg/cm2
D. 7500-10,000 kg/cm2
E. 10,000-15,000 kg/cm2
