Machine Design
A screw is said to be over hauling screw, if the

Efficiency of screw is 100%
Friction angle is equal to helix angle
Friction angle is less than helix angle
Friction angle is more than helix angle

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

Both (A) and (B)
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
The efficiency of a self locking screw can not be more than 50%

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