Recent questions tagged second-law-of-thermodynamics

Match the Thermodynamic laws in Column $\text{I}$ with the description given in Column $\text{II}$${\text{Column I}}$${\text{Column II}}$$\text{P}$Zeroth law$1$Entropy of...

A house looses heat at a rate of $150$ $\mathrm{MJ}$ per hour. The temperature outside the house is $-3{ }^{\circ} \mathrm{C}$. The minimum power (in $\mathrm{kW}$) requi...

$M \mathrm{~kg}$ of a liquid at a temperature $T_{1}$ is mixed with $M \mathrm{~kg}$ of the same liquid at another temperature $T_{2}$ in an isolated tank at constant pre...

Consider an ideal Rankine cycle with fixed conditions at the turbine inlet. If the condenser pressure is lowered, which of the following statements is/are CORRECT?Pump wo...

A rigid spherical solid ball at $1000^{\circ} \mathrm{C}$ is cooled slowly to $200^{\circ} \mathrm{C}$ in a surrounding air at $25^{\circ} \mathrm{C}$. The density, speci...

A mixture of helium $\text{(He)}$ and nitrogen ($\mathrm{N}_{2}$) expands in a turbine from $800$ $\mathrm{kPa}$ to $100$ $\mathrm{kPa}$. The mixture composition is $40\%...

​​​​​Let $T_{H}$ and $T_{L}$ denote the absolute temperatures of high and low temperature reservoirs, respectively. The coefficient of performance of a reversible refrige...

A heat engine having thermal efficiency of $40 \%$ receives heat from a source at $600 \: \mathrm{K}$ and rejects heat to a sink at $300 \: \mathrm{K}$. The second-law ef...

Air enters a hair dryer at $22^{\circ} \mathrm{C}$ and $100 \: \mathrm{kPa}$ with a velocity of $3.7 \mathrm{~m} / \mathrm{s}$, and leaves the dryer at $83{ }^{\circ} \ma...

Two Carnot heat engines ($\text{E1}$ and $\text{E2}$) are operating in series as shown in figure. Engine $\text{E1}$ receives heat from a reservoir at $T_{H}=1600 \mathrm...

A heat source at temperature $T_{H}$ transfers the same amount of heat to a sink under the following situations:Case A: Sink is at temperature $T_{L, 1}$Case B: Sink is a...

A closed system containing an unknown substance undergoes an adiabatic process governed by the relation $P V^{\gamma}=$ constant, where $P$ is pressure, $V$ is volume, an...

A Carnot engine operates between two temperatures $T_{1}$ and $T_{2}$ such that $T_{1}>T_{2}$. If the thermal efficiency of the engine is to be increased by changing one ...

Q. 108 An office uses a heat pump to receive $500 \mathrm{~kJ} /$ day heat in winter to maintain its temperature at $300 \mathrm{~K}$. The ambient temperature is $280 \ma...