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 ?

A steam engine delivers 5.4 xx 10^(8) j of work per minute and absorbs

1.	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 ?
Answer» `10%` `12%` `15%` `18%` Solution :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%`