G L Mittal and TARUN MITTAL Solutions for Chapter: Carnot's Heat Engine : Second Law of Thermodynamics, Exercise 3: FOR DIFFERENT COMPETITIVE EXAMINATIONS

A Carnot engine operation between temperatures $T_1$ and $T_2$ has efficiency $\frac{1}{6}$. When $T_2$ is lowered by $62 \mathrm{K}$, its efficiency increases to $\frac{1}{3}$. Then $T_1$ and $T_2$ are, respectively,

A Carnot engine has an efficiency of $40\%$. The temperature of the sink is $300 \mathrm{K}$. By how much should the temperature of the source be increased so as to increase the efficiency to $60\%$ ?

The temperatures of the source and the sink of a Carnot's engine are $0°\mathrm{C}$ and $0°\mathrm{F}$ respectively. The efficiency of the engine will increase if temperature$($s$)$ of :

A Carnot engine takes in $3000 \mathrm{kcal}$ of heat from a reservoir at $627°\mathrm{C}$ and gives it to a sink at $27°\mathrm{C}$. The work done by the engine is :

A refrigerator is:

The temperatures inside and outside a refrigerator are $246 \mathrm{K}$ and $273 \mathrm{K}$ respectively. The heat delivered to the surroundings for every joule of work done is roughly :

The door of a running refrigerator inside a closed room is left open. Which statement is true?

A diatomic ideal gas is used in a Carnot engine as the working substance. If, during the adiabatic expansion part of the cycle the volume of the gas increases from $\mathrm{V}$ to $32 \mathrm{V}$, the efficiency of the engine is :