Work done on or by a gas, in general depends upon the
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(d)Work done $ = \int_{\,1}^{\,2} {\,PdV} $, which is state dependent as well as path dependent.
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For an ideal heat engine, the temperature of the source is $127\,^{\circ} C$. In order to have $60\, \%$ efficiency the temperature of the sink should be $........\,{ }^{\circ} C$. (Round off to the Nearest Integer)
A thin piece of thermal conductor of constant thermal conductivity insulated on the lateral sides connects two reservoirs which are maintained at temperatures $T_{1}$ and $T_{2}$ as shown in the figure alongside. Assuming that the system is in steady state, which of the following plots best represents the dependence of the rate of change of entropy on the ratio of $T_{1} / T_{2}$ ?
A system goes from $A$ to $B$ via two processes $I$ and $II$ as shown in figure. If $\Delta {U_1}$ and $\Delta {U_2}$ are the changes in internal energies in the processes $I$ and $II$ respectively, then
The $P-V$ diagram of a diatomic ideal gas system going under cyclic process as shown in figure. The work done during an adiabatic process $CD$ is (use $\gamma=1.4$) (in $J$)
A Carnot engine take $5000 \,k\,cal$ of heat from a reservoir at $727\,^{\circ}C$ and gives heat to a $\operatorname{sink}$ at $127\,^{\circ}C$. The work done by the engine is $.......... \times 10^{6}\,J$
Three Carnot engines operate in series between a heat source at a temperature $T_1$ and a heat sink at temperature $T_4$ (see figure). There are two other reservoirs at temperature $T_2$ and $T_3$, as shown, with $T_1 > T_2 > T_3 > T_4$. The three engines are equally efficient if