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
(D) 0.6
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
(D) is always beneficial
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
(D) none of the above
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
(D) none of the above
Which process will increase the fatigue duration of parts ?
(A) finishing and polishing
(B) shot-peening
(C) decarburisation
(D) electroplating
(D) all of the above”.
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
(D) all of the above
Yield point in fatigue loading as compared to static loading is__________________?
(A) same
(B) higher
(C) lower
(D) depends on other factors
(D) none of the above
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
(D) none of the above
An alien bolt is___________________?
(A) self locking bolt
(B) same as stud
(C) provided with hexagonal depression in head
(D) used in high speed components
(D) provided with countersunk head
Set screws are_________________?
(A) similar to small size tap bolts except that a greater variety of shapes of heads are available
(B) slotted for a screw driver and generally used with a nut
(C) used to prevent relative motion be-tween parts
(D) similar to stud
(D) none of the above