1. The efficiency of a self-locking screw cannot be more than 50% |
2. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50% |
3. The efficiency of ACME (trapezoidal) thread is less than that of square thread. |
A) 1, 2 and 3-are correct
B) 2 and 3 are correct
C) 1 and 3 are correct
D) 1 and 2 are correct
Correct Answer: A
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