Machine Design
The creep in the belt is due to

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

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Machine Design
Which of the following statement is correct regarding power screws?

If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
Both (A) and (B)
The efficiency of a self locking screw can not be more than 50%

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