If the Carnot engine is operated between the same two reservoirs, then which of the following statement is correct.

If the Carnot engine is operated between the same two reservoirs, then which of the following statement is correct

a. Thermal efficiency of Carnot engine changes with the change of working substance
b. Thermal efficiency of Carnot engine remains same with the change of working substance
c. Thermal efficiency of Carnot engine remains same with the change of size of engine
d. Option b. and c

Correct Answer : d. Option b. and c.

Explanation :

The Carnot cycle is particularly important for the logical development of thermodynamics. Carnot engines can be operated with all sorts of working substances. All Carnot engines, irrespective of size, design, choice of working substances, etc., have same thermal efficiency if they operate between same two reservoirs.