engineering recuitment HPCL Junior Executive 2025 Mock Test Thermodynamics Second Law of Thermodynamics and Entropy Carnot's Theorem and its Corollary
A Carnot cycle operates between two temperatures T1 and T2. The efficiency of the cycle is given by η = (T1 − T2) / T1. Which of the following statements is correct?
1
The efficiency of the Carnot cycle is always equal to that of any other heat engine operating between the same two temperatures.
2
The efficiency of the Carnot cycle depends on the working substance used.
3
The efficiency of the Carnot cycle is always less than that of any other heat engine operating between the same two temperatures.
4
The efficiency of the Carnot cycle is always greater than that of any other heat engine operating between the same two temperatures.