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Which of the following statement is correct regarding power screws? | |
A. | The efficiency of a self locking screw can not be more than 50% [Wrong Answer] |
B. | The efficiency of Acme (trapezoidal) thread is less than that of a square thread [Wrong Answer] |
C. | If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50% [Wrong Answer] |
D. | (A) and (B) Only [Correct Answer] |