Heat Engine|Kelvin's -Plank Statement|Carnot Engine|Questions

Carnot engine is

Carnot Engine and Refrigerator

Assertion: Efficiency of a heat engine can't be greater than efficiency of Carnot engine. Reason: Effieciency of any engine is never 100%

In practise, all heat engines have efficiency less than that of a carnot engine because

Limitations OF FLOT || Spontaneous and non-spontaneous Process || Heat Engine and its Efficiency || Carnot theorem and Carnot Cycle || First Statement OF SLOT (Second Law OF Thermodynamics)

Source temperature of a carnot engine is 127 celsius if efficiency of carnot engine is 60% then find sink temperature

Cascaded Carnot engine is an arrangement in which heat sink of one engine is source for other. If high temperature for one engine is T_1 , low temperature for other engine is T_2 (Assume work done by both engine is same) Calculate lower temperature of first engine