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Consider the following statements regarding power screws.            

1.   The efficiency of self locking screw cannot be more than 50%

2.   If 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.

         Which of these statements are correct?

(a) 1, 2 and 3                  (b) 2 and 3     

(c) 1 and 3                      (d) 1 and 2

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