Question

The Efficiency(E) of any machine is given by:-

• A. $E=\frac{\text{Work input}}{\text{Work output}}$
• B. $E=\frac{\text{Effort}}{\text{Load}}$
• C. $E=\frac{\text{V.R.}}{\text{MA}}$
• D. $E=\frac{\text{Work output}}{\text{Work~ input}}\text{or}E=\frac{\text{MA}}{\text{V.R.}}$

Answer 1

The correct option is D

$E=\frac{\text{Work output}}{\text{Work~ input}}\text{or}E=\frac{\text{MA}}{\text{V.R.}}$

Mechanical efficiency(E) 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,

$E=\frac{\text{Work output}}{\text{Work input}}$

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