Heat Engines

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 $V$ to $32 \mathrm{V}$, the efficiency of the engine is,

A Carnot engine works between constant temperature $T_1$ and $T_2$ of source and sink, respectively. For efficiency to be greatest

An ideal gas heat engine operates in a carnot cycle between $227°\mathrm{C}$ and $127°\mathrm{C}$. It absorbs $6 \mathrm{kcal}$ at the higher temperature. The amount of heat (in $\mathrm{kcal}$) converted into work is equal to 

Consider a Carnot cycle operating between source temperature $750 \mathrm{K}$ and sink temperature $350 \mathrm{K}$ producing$1.25 \mathrm{kJ}$ of mechanical work per cycle, the heat transferred to the engine by the reservoirs

The thermodynamic efficiency of cell is given by

An ideal gas heat engine is operating between $227 °\mathrm{C}$ and $127 °\mathrm{C}$. It absorbs ${10}^4$ J of heat at the higher temperature. The amount of heat converted into work is

A heat engine is a device

The value of sink temperature, when the efficiency of the engine is 100% , is 

The sink temperature of a heat engine $77℃.$ The efficiency is 30%. The source temperature is

An ideal heat engine has an efficiency $\eta$. The coefficient of performance of the engine when drive backward will be

The temperatures T₁ and T₂ of heat reservoirs in the ideal Carnot engine are 1500^oC and 500^oC respectively. If T₁ increases by 100^oC, the efficiency of the engine is