Carnot Engine

For which combination of working temperature, the efficiency of Carnot's engine is the least ?

An ideal Carnot's engine works between 227^(@)C and 57^(@)C . The efficiency of the engine will be

For which combination of working temperatures the efficiency of Carnot’s engine is highest

An ideal Carnot's engine whose efficiency 40% receives heat of 500K. If the efficiency is to be 50% then the temperature of sink will be

A carnot's engine works between a source at a temperature of 27^(@)C and a sink at -123 ^(@)C . Its efficiency is

The efficiency of a Carnot heat engine

Efficiency of a Carnot heat engine may be given as