For a power screw, the efficiency \(e\) is defined as the ratio of the ideal torque (frictionless) to the actual raising torque. For a square thread, \(e\) equals:

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Mechanical Engineering QUESTION #2464

Question 1

\(e = \frac{Fl}{2\pi T_r}\)✔️
\(e = \frac{T_r}{T_0}\)
\(e = \mu\tan\lambda\)
\(e = \frac{\pi d_m}{l}\)

Correct Answer Explanation

The ideal (frictionless) torque to raise load \(F\) through one revolution is \(T_0=Fl/(2\pi)\). Efficiency: \(e=T_0/T_r=Fl/(2\pi T_r)\).

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