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  • question_answer 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

    Correct Answer: A

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