M

Mr. Dubey • 52.26K Points
Coach 

Q. Which of the following statement is correct regarding power screws?

(A) The efficiency of a self locking screw can not be more than 50%
(B) The efficiency of Acme (trapezoidal) thread is less than that of a square thread
(C) If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
(D) Both (A) and (B)
Correct : Option (D)

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