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mechanical engineering machine design
1. Which of the following statement is correct regarding power screws?
(A): and Only
(B): If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
(C): The efficiency of a self locking screw can not be more than 50%
(D): The efficiency of Acme (trapezoidal) thread is less than that of a square thread
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