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
E. 0.6
Machine Design
Residual stress in materials_________________?
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
E. is always beneficial
Cold working________________?
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
E. none of the above
In nitrated parts, the origins of the fatigue cracks will occur at__________________?
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
E. none of the above
Which process will increase the fatigue duration of parts ?
Which process will increase the fatigue duration of parts ?
A. finishing and polishing
B. shot-peening
C. decarburisation
D. electroplating
E. all of the above”.
The building up of worn and uridersized parts, subjected to repeated loads by electroplating is_____________________?
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
E. all of the above
Yield point in fatigue loading as compared to static loading is__________________?
Yield point in fatigue loading as compared to static loading is__________________?
A. same
B. higher
C. lower
D. depends on other factors
E. none of the above
The fatigue limit of a material____________________?
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
E. none of the above
The ultimate strength of steel in tension in comparison to shear is in the ratio of__________________?
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
E. 1 : 2
The permissible stress for carbon steel under static loading is generally taken as__________________?
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
E. 10,000-15,000 kg/cm2