A carnot engine has an efficiency of 20%. The energy is supplied to the engine at the rateof `2kW`. What is the output power of the engine?

Options

A. 300 W
B. 400 W
C. 500 W
D. 600 W

Answer

B

Explanation

Efficiency of the engine = 20% = 0.2
Rate of energy supplied i.e. Power = 2 KW
For any engine, `eta=("Power output")/("Power input")`
`therefore0.2=("Power output")/(2xx1000)`
`therefore` Output power = 2000 `xx` 0.2= 400 W