Question

In one cycle, a heat engine takes in 810 J of heat from a high-temperature reservoir, releases some heat to a lower-temperature reservoir, and does 411 J of work. What is its efficiency?

Answer 1

`51%`

Explanation:

Coefficient of efficiency of a heat engine `eta = W/Q` (where, `W` is the work done by it and `Q` is the total heat taken from the heat source)

Given, `W=411J,Q=810J`

So, `eta = 411/810=0.51`

So,efficiency = `0.51*100 =51 %`