A steam engine delivers `5.4 xx 10^(8) j` of work per minute and absorbs `3.6 xx 10^(9) J` of heat per minute from its boiler. What is the efficiency of the engine ?

Options

A. `10%`
B. `12%`
C. `15%`
D. `18%`

Answer

C

Explanation

Output i.e. useful work done per min `= 5.4 xx 10^(8) J`
Input i.e., heat absorbed per min `= 3.6 xx 10^(9) J`
Efficiency `= ("Output")/("Input") = (5.4 xx 10^(8))/(3.6 xx 10^(9)) = (3)/(20) = (3)/(20) xx 100% = 15%`