AP EAMCET20224 Jul 2022Morning ShiftPhysicsThermodynamicsActual
A car engine has a power of 20 kW . The car makes a roundtrip of 1 hour. If the thermal efficiency of the engine is 40 % and the ambient temperature is 300 K . The energy generated by fuel combustion is
Options
- A180000   kJ
- B240000   kJ
- C360000   kJ
- D270000   kJ
Correct answer
A. 180000   kJ
Step-by-step solution
Energy produced by car engine in 1 hour = 20 × 1000 × 3600 ⇒ 7 . 2 × 10 7   J Considering efficiency of 40 % , Q = E η = 7 . 2 × 10 7 0 . 4 = 180000   kJ