Question

An ideal gas heat engine is operating between 227°C and 127°C. It absorbs 10^4 J of heat at the higher temperature. The amount of heat converted into work is?

(a) 2000 J

(b) 4000 J

(c) 8000 J

(d) 5600 J

I have been asked this question during an interview for a job.

The query is from Thermal Equilibrium in section Kinetic Theory of Gases of Engineering Physics I

Answer 1

The correct answer is (a) 2000 J

For explanation I would say: Ƞ=1-T2/T1 = 1-(273+127)/(273+227)=1-400/500=1/5

W=ȠQ1=1/5×10^4=2000J.