Question

An engine is designed to convert $20\%$ of heat energy into work. If the steam in the engine has $80$KJ of heat energy, the useful work done by the engine is.

• A. $16$KJ
• B. $100$KJ
• C. $40$KJ
• D. $50$KJ

Answer 1

Answer: (A)

$16$KJ

An engine is designed to convert 20% of heat energy into work. If the steam in the engine has 80KJ of heat energy, the useful work done by the engine is

$U=80KJ\ast \frac{20}{100}=16KJ$