Which of the following

Question

Which of the following statement is correct regarding power screws?

Options:

A . The efficiency of a self locking screw can not be more than 50%

B . The efficiency of Acme (trapezoidal) thread is less than that of a square thread

C . If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%

D . (A) and (B) Only

Answer: Option D

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