Question

If steam enters a turbine at 600K and is exhausted at 400K, calculate the efficiency of the engine.

Answer 1

The formular for efficiency = change in temprature/ initial temprature
change in temprature = 600 - 400 = 200
efficiency = 200/600 = 0.333 = 33.3%'

Answer 2

The correct answer to the question is 33.3 % i.e the efficiency of the engine is 33.3 %.

CALCULATION:

The steam enters a turbine at 600 K.

Hence, the temperature of the source T = 600 K.

The steam is exhausted at a temperature 400 K.

Hence, the temperature of the sink T' = 400 K

We are asked to calculate the efficiency of the engine.

The efficiency of a heat engine whose source is at temperature T K and sink at T' is calculated as -

efficiency
`\eta\ =\ 1-(T')/(T)`

`=\ 1-(400\ K)/(600\ K)`

`=\ 1-(2)/(3)`

`=\ (1)/(3)`

`=\ 33.3\%` [ans]

Hence, the efficiency of the engine is 33.3 %.