What should be the condition for the efficiency of a carnot engine to be equal to `1`?

Carnot engine is

The efficiency of carnot engine depends on

Efficiency of a Carnot heat engine may be given as

What is the efficiency of a carnot engine working between ice point and steam point ?

The efficiency of a Carnot engine working between 800 K and 500 K is -

Assetion : No engine can have efficiencyt greater than that of the carnot engine Reason : The efficiencyt of a cornot engine is given by eta =1-(T_(2))/(T_(1))

If the temperature of sink is at absolute zero, then the efficiency of carnot engine will be

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

Assertion : Efficiency of a Carnot engine increase on reducing the temperature of sink. Reason : The efficiency of a Carnot engine is defined as ratio of net mechanical work done per cycle by the gas to the amount of heat energy absorbed per cycle from the source.

Calculate the efficiency of a carnot engine working between the two temperatures: 30^(@)Cand 100^(@)C