Question

The efficiency of any machine is given by ___ .

• A. $E=\frac{Workinput}{Workoutput}$
• B. $E=\frac{Effort}{Load}$
• C. $E=\frac{V.R.}{MA}$
• D. $E=\frac{Workoutput}{Workinput}$ or $E=\frac{MA}{V.R.}$

Answer 1

The correct option is D

$E=\frac{Workoutput}{Workinput}$ or $E=\frac{MA}{V.R.}$

Mechanical efficiency measures the effectiveness of a machine in transforming the energy and power that is input to the device into an output force and movement. In simple words, it is calculated by taking the ratio of output work to input work.

i.e. Efficiency is written as,

$E=\frac{Workoutput}{Workinput}=\frac{L\times loaddistance}{E\times effortdistance}$

i.e. $E=\frac{MA}{V.R.}$