Second Law of Thermodynamics and Carnot Engine
PHXI12:THERMODYNAMICS

371388 A Carnot engine whose heat sinks at \(27^\circ C\), has an efficiency of \(25\,\% \). By how many degrees should the temperature of the source be changed to increase the efficiency by \(100\,\% \) of the original efficiency?

1 Increase by \(18^\circ C\)
2 Increase by \(200^\circ C\)
3 Increase by \(120^\circ C\)
4 Increase by \(73^\circ C\)
PHXI12:THERMODYNAMICS

371389 The \(P-V\) diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, the area enclosed by the \(P-V\) diagram is [The heat supplied to the gas is \(8000\;J]\)
supporting img

1 \(3000\;J\)
2 \(1000\;J\)
3 \(1200\;J\)
4 \(2000\;J\)
PHXI12:THERMODYNAMICS

371390 Two carnot engines \(A\) and \(B\) are operated in series. The engine A receives heat from the source at temperature \(T_{1}\) and rejects the heat to the sink at temperature \(T\). The second engine \(\mathrm{B}\) receives to its sink at temperature \(T_{2}\). For what value of \(T\) the efficiencies of the two engines are equal?

1 \(\dfrac{T_{1}-T_{2}}{2}\)
2 \(\dfrac{T_{1}+T_{2}}{2}\)
3 \(\sqrt{T_{1} T_{2}}\)
4 \(T_{1} T_{2}\)
PHXI12:THERMODYNAMICS

371391 A carnot engine operates between the temperatures \({T_H} = 850\;K\) and \({T_L} = 300\;K\). The engine performs \(1200\;J\) of work in each cycle which takes \(0.25\,\sec \). How much energy is delivered as heat to the low temperature reservoir in each cycle?

1 \(655\;J\)
2 \(600\;J\)
3 \(1855\;J\)
4 \(1200\;J\)
PHXI12:THERMODYNAMICS

371392 What is the source temperature of the Carnot engine required to get \(70\,\% \) efficiency? Given sink temperature \(=27^{\circ} \mathrm{C}\)

1 \(270^\circ C\)
2 \(1000^\circ C\)
3 \(727^\circ C\)
4 \(90^\circ C\)
PHXI12:THERMODYNAMICS

371388 A Carnot engine whose heat sinks at \(27^\circ C\), has an efficiency of \(25\,\% \). By how many degrees should the temperature of the source be changed to increase the efficiency by \(100\,\% \) of the original efficiency?

1 Increase by \(18^\circ C\)
2 Increase by \(200^\circ C\)
3 Increase by \(120^\circ C\)
4 Increase by \(73^\circ C\)
PHXI12:THERMODYNAMICS

371389 The \(P-V\) diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, the area enclosed by the \(P-V\) diagram is [The heat supplied to the gas is \(8000\;J]\)
supporting img

1 \(3000\;J\)
2 \(1000\;J\)
3 \(1200\;J\)
4 \(2000\;J\)
PHXI12:THERMODYNAMICS

371390 Two carnot engines \(A\) and \(B\) are operated in series. The engine A receives heat from the source at temperature \(T_{1}\) and rejects the heat to the sink at temperature \(T\). The second engine \(\mathrm{B}\) receives to its sink at temperature \(T_{2}\). For what value of \(T\) the efficiencies of the two engines are equal?

1 \(\dfrac{T_{1}-T_{2}}{2}\)
2 \(\dfrac{T_{1}+T_{2}}{2}\)
3 \(\sqrt{T_{1} T_{2}}\)
4 \(T_{1} T_{2}\)
PHXI12:THERMODYNAMICS

371391 A carnot engine operates between the temperatures \({T_H} = 850\;K\) and \({T_L} = 300\;K\). The engine performs \(1200\;J\) of work in each cycle which takes \(0.25\,\sec \). How much energy is delivered as heat to the low temperature reservoir in each cycle?

1 \(655\;J\)
2 \(600\;J\)
3 \(1855\;J\)
4 \(1200\;J\)
PHXI12:THERMODYNAMICS

371392 What is the source temperature of the Carnot engine required to get \(70\,\% \) efficiency? Given sink temperature \(=27^{\circ} \mathrm{C}\)

1 \(270^\circ C\)
2 \(1000^\circ C\)
3 \(727^\circ C\)
4 \(90^\circ C\)
PHXI12:THERMODYNAMICS

371388 A Carnot engine whose heat sinks at \(27^\circ C\), has an efficiency of \(25\,\% \). By how many degrees should the temperature of the source be changed to increase the efficiency by \(100\,\% \) of the original efficiency?

1 Increase by \(18^\circ C\)
2 Increase by \(200^\circ C\)
3 Increase by \(120^\circ C\)
4 Increase by \(73^\circ C\)
PHXI12:THERMODYNAMICS

371389 The \(P-V\) diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, the area enclosed by the \(P-V\) diagram is [The heat supplied to the gas is \(8000\;J]\)
supporting img

1 \(3000\;J\)
2 \(1000\;J\)
3 \(1200\;J\)
4 \(2000\;J\)
PHXI12:THERMODYNAMICS

371390 Two carnot engines \(A\) and \(B\) are operated in series. The engine A receives heat from the source at temperature \(T_{1}\) and rejects the heat to the sink at temperature \(T\). The second engine \(\mathrm{B}\) receives to its sink at temperature \(T_{2}\). For what value of \(T\) the efficiencies of the two engines are equal?

1 \(\dfrac{T_{1}-T_{2}}{2}\)
2 \(\dfrac{T_{1}+T_{2}}{2}\)
3 \(\sqrt{T_{1} T_{2}}\)
4 \(T_{1} T_{2}\)
PHXI12:THERMODYNAMICS

371391 A carnot engine operates between the temperatures \({T_H} = 850\;K\) and \({T_L} = 300\;K\). The engine performs \(1200\;J\) of work in each cycle which takes \(0.25\,\sec \). How much energy is delivered as heat to the low temperature reservoir in each cycle?

1 \(655\;J\)
2 \(600\;J\)
3 \(1855\;J\)
4 \(1200\;J\)
PHXI12:THERMODYNAMICS

371392 What is the source temperature of the Carnot engine required to get \(70\,\% \) efficiency? Given sink temperature \(=27^{\circ} \mathrm{C}\)

1 \(270^\circ C\)
2 \(1000^\circ C\)
3 \(727^\circ C\)
4 \(90^\circ C\)
PHXI12:THERMODYNAMICS

371388 A Carnot engine whose heat sinks at \(27^\circ C\), has an efficiency of \(25\,\% \). By how many degrees should the temperature of the source be changed to increase the efficiency by \(100\,\% \) of the original efficiency?

1 Increase by \(18^\circ C\)
2 Increase by \(200^\circ C\)
3 Increase by \(120^\circ C\)
4 Increase by \(73^\circ C\)
PHXI12:THERMODYNAMICS

371389 The \(P-V\) diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, the area enclosed by the \(P-V\) diagram is [The heat supplied to the gas is \(8000\;J]\)
supporting img

1 \(3000\;J\)
2 \(1000\;J\)
3 \(1200\;J\)
4 \(2000\;J\)
PHXI12:THERMODYNAMICS

371390 Two carnot engines \(A\) and \(B\) are operated in series. The engine A receives heat from the source at temperature \(T_{1}\) and rejects the heat to the sink at temperature \(T\). The second engine \(\mathrm{B}\) receives to its sink at temperature \(T_{2}\). For what value of \(T\) the efficiencies of the two engines are equal?

1 \(\dfrac{T_{1}-T_{2}}{2}\)
2 \(\dfrac{T_{1}+T_{2}}{2}\)
3 \(\sqrt{T_{1} T_{2}}\)
4 \(T_{1} T_{2}\)
PHXI12:THERMODYNAMICS

371391 A carnot engine operates between the temperatures \({T_H} = 850\;K\) and \({T_L} = 300\;K\). The engine performs \(1200\;J\) of work in each cycle which takes \(0.25\,\sec \). How much energy is delivered as heat to the low temperature reservoir in each cycle?

1 \(655\;J\)
2 \(600\;J\)
3 \(1855\;J\)
4 \(1200\;J\)
PHXI12:THERMODYNAMICS

371392 What is the source temperature of the Carnot engine required to get \(70\,\% \) efficiency? Given sink temperature \(=27^{\circ} \mathrm{C}\)

1 \(270^\circ C\)
2 \(1000^\circ C\)
3 \(727^\circ C\)
4 \(90^\circ C\)
PHXI12:THERMODYNAMICS

371388 A Carnot engine whose heat sinks at \(27^\circ C\), has an efficiency of \(25\,\% \). By how many degrees should the temperature of the source be changed to increase the efficiency by \(100\,\% \) of the original efficiency?

1 Increase by \(18^\circ C\)
2 Increase by \(200^\circ C\)
3 Increase by \(120^\circ C\)
4 Increase by \(73^\circ C\)
PHXI12:THERMODYNAMICS

371389 The \(P-V\) diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, the area enclosed by the \(P-V\) diagram is [The heat supplied to the gas is \(8000\;J]\)
supporting img

1 \(3000\;J\)
2 \(1000\;J\)
3 \(1200\;J\)
4 \(2000\;J\)
PHXI12:THERMODYNAMICS

371390 Two carnot engines \(A\) and \(B\) are operated in series. The engine A receives heat from the source at temperature \(T_{1}\) and rejects the heat to the sink at temperature \(T\). The second engine \(\mathrm{B}\) receives to its sink at temperature \(T_{2}\). For what value of \(T\) the efficiencies of the two engines are equal?

1 \(\dfrac{T_{1}-T_{2}}{2}\)
2 \(\dfrac{T_{1}+T_{2}}{2}\)
3 \(\sqrt{T_{1} T_{2}}\)
4 \(T_{1} T_{2}\)
PHXI12:THERMODYNAMICS

371391 A carnot engine operates between the temperatures \({T_H} = 850\;K\) and \({T_L} = 300\;K\). The engine performs \(1200\;J\) of work in each cycle which takes \(0.25\,\sec \). How much energy is delivered as heat to the low temperature reservoir in each cycle?

1 \(655\;J\)
2 \(600\;J\)
3 \(1855\;J\)
4 \(1200\;J\)
PHXI12:THERMODYNAMICS

371392 What is the source temperature of the Carnot engine required to get \(70\,\% \) efficiency? Given sink temperature \(=27^{\circ} \mathrm{C}\)

1 \(270^\circ C\)
2 \(1000^\circ C\)
3 \(727^\circ C\)
4 \(90^\circ C\)