148657 Let $\eta_{1}$ is the efficiency of an engine at $T_{1}=447^{\circ}$ $C$ and $T_{2}=147^{\circ} \mathrm{C}$ While $\eta_{2}$ is the efficiency at $T_{1}=947^{\circ} \mathrm{C}$ and $T_{2}=47^{\circ} \mathrm{C}$, the ratio $\frac{\eta_{1}}{\eta_{2}}$ will be:

148658 Heat is flowing from a refrigerator whose inside temperature is $280 \mathrm{~K}$ to a room at $300 \mathrm{~K}$. Then the amount of heat delivered to the room for each joule of electrical energy consumed in joules is

148659 A heat engine operates between a cold reservoir at temperature $300 \mathrm{~K}$ and a hot reservoir at temperature $T_{1} K$. It takes $200 \mathrm{~J}$ of heat from the hot reservoir and delivers $120 \mathrm{~J}$ of heat to the cold reservoir in a cycle. The minimum temperature $\left(T_{1}\right)$ of the hot reservoir is

148660 A Carnot engine operates between a source and a sink. The efficiency of the engine is $40 \%$ and the temperature of the sink is $27^{\circ} \mathrm{C}$. If the efficiency is to be increased to $50 \%$ then the temperature of the source must be increased by

148657 Let $\eta_{1}$ is the efficiency of an engine at $T_{1}=447^{\circ}$ $C$ and $T_{2}=147^{\circ} \mathrm{C}$ While $\eta_{2}$ is the efficiency at $T_{1}=947^{\circ} \mathrm{C}$ and $T_{2}=47^{\circ} \mathrm{C}$, the ratio $\frac{\eta_{1}}{\eta_{2}}$ will be:

148658 Heat is flowing from a refrigerator whose inside temperature is $280 \mathrm{~K}$ to a room at $300 \mathrm{~K}$. Then the amount of heat delivered to the room for each joule of electrical energy consumed in joules is

148659 A heat engine operates between a cold reservoir at temperature $300 \mathrm{~K}$ and a hot reservoir at temperature $T_{1} K$. It takes $200 \mathrm{~J}$ of heat from the hot reservoir and delivers $120 \mathrm{~J}$ of heat to the cold reservoir in a cycle. The minimum temperature $\left(T_{1}\right)$ of the hot reservoir is

148660 A Carnot engine operates between a source and a sink. The efficiency of the engine is $40 \%$ and the temperature of the sink is $27^{\circ} \mathrm{C}$. If the efficiency is to be increased to $50 \%$ then the temperature of the source must be increased by

148657 Let $\eta_{1}$ is the efficiency of an engine at $T_{1}=447^{\circ}$ $C$ and $T_{2}=147^{\circ} \mathrm{C}$ While $\eta_{2}$ is the efficiency at $T_{1}=947^{\circ} \mathrm{C}$ and $T_{2}=47^{\circ} \mathrm{C}$, the ratio $\frac{\eta_{1}}{\eta_{2}}$ will be:

148658 Heat is flowing from a refrigerator whose inside temperature is $280 \mathrm{~K}$ to a room at $300 \mathrm{~K}$. Then the amount of heat delivered to the room for each joule of electrical energy consumed in joules is

148659 A heat engine operates between a cold reservoir at temperature $300 \mathrm{~K}$ and a hot reservoir at temperature $T_{1} K$. It takes $200 \mathrm{~J}$ of heat from the hot reservoir and delivers $120 \mathrm{~J}$ of heat to the cold reservoir in a cycle. The minimum temperature $\left(T_{1}\right)$ of the hot reservoir is

148660 A Carnot engine operates between a source and a sink. The efficiency of the engine is $40 \%$ and the temperature of the sink is $27^{\circ} \mathrm{C}$. If the efficiency is to be increased to $50 \%$ then the temperature of the source must be increased by

148657 Let $\eta_{1}$ is the efficiency of an engine at $T_{1}=447^{\circ}$ $C$ and $T_{2}=147^{\circ} \mathrm{C}$ While $\eta_{2}$ is the efficiency at $T_{1}=947^{\circ} \mathrm{C}$ and $T_{2}=47^{\circ} \mathrm{C}$, the ratio $\frac{\eta_{1}}{\eta_{2}}$ will be:

148658 Heat is flowing from a refrigerator whose inside temperature is $280 \mathrm{~K}$ to a room at $300 \mathrm{~K}$. Then the amount of heat delivered to the room for each joule of electrical energy consumed in joules is

148659 A heat engine operates between a cold reservoir at temperature $300 \mathrm{~K}$ and a hot reservoir at temperature $T_{1} K$. It takes $200 \mathrm{~J}$ of heat from the hot reservoir and delivers $120 \mathrm{~J}$ of heat to the cold reservoir in a cycle. The minimum temperature $\left(T_{1}\right)$ of the hot reservoir is

148660 A Carnot engine operates between a source and a sink. The efficiency of the engine is $40 \%$ and the temperature of the sink is $27^{\circ} \mathrm{C}$. If the efficiency is to be increased to $50 \%$ then the temperature of the source must be increased by