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This question belongs to Mechanical Engineering Machine Design

Machine Design

?

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)

Answer & Solution

Correct Answer: Option D

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Question posted by Examveda

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Anil Vinzuda 5 years ago

Options B and C correct
The efficiency of self locking screws is less than 50%

PRATIK KHANKAL 8 years ago

If friction angle is less than helix angle, then the screw will be Overhauling & efficiency of overhauling screw is more than 50%..so all options are correct

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