Question

An ideal gas heat engine operates in a Carnot cycle between 227°C and, 127°C. It absorbs 6 k cal at the higher temperature. The amount of heat (in k cal) converted into work is equal to

(a) 4.8

(b) 3.5

(c) 1.6

(d) 1.2

Answer 1

Correct option (d) 1.2

Explanation:

 Efficiency of Carnot engine

Answer 2

We have QT = consta nt ⇒ Q₂/Q₁ = T₂/T₁

Given, 

Q₁ = 6×10⁴ cal,

T₁ = 227+ 273 = 500K

T₂ = 127 + 273 = 400K

= 1.2