Consider the following statements regarding power screws: 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. Of these statements:

Consider the following statements regarding power screws:

1.	Consider the following statements regarding power screws: 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. Of these statements:
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
Answer» B. 2 and 3 are correct

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