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

Answer

B

Explanation

Efficiency of the engine
`=20%=0.2`
Rate of energy supplied
Power `=2kW`
For any engine `eta=("Power output")/("Power input")`
`:.0.2=("Power output")/(2xx100)`
`:.` Output power `=200xx0.2=400W`