Machine Design
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

Jam nut
Sawn nut
Castle nut
Ring nut

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
The creep in the belt is due to

Effect of temperature on belt
Material of belt
Unequal extensions in the belt due to tight and slack side tensions
Stresses beyond elastic limit of belt material

ANSWER DOWNLOAD EXAMIANS APP