Second Law of Thermodynamics and Carnot Engine
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PHXI12:THERMODYNAMICS

371414 Carnot engine cannot give \(100\,\% \) efficiency, because we cannot:

1 Find ideal sources
2 Eliminate friction
3 Reach absolute zero temperature
4 Prevent radiation
PHXI12:THERMODYNAMICS

371415 A Carnot engine takes heat from a reservoir at \(627^\circ C\) and rejects heat to a sink at \(27^\circ C.\) Its efficiency will be

1 \(3 / 5\)
2 \(1 / 3\)
3 \(2 / 3\)
4 \(200 / 209\)
PHXI12:THERMODYNAMICS

371416 A carnot engine whose low temperature reservoir is at \(7^\circ C\) has an efficiency of \(50\,\% \). It is desired to increase the efficiency to \(70\,\% \). By how many degrees should the temperature of the high temperature reservoir be increased

1 \(280\;K\)
2 \(840\;K\)
3 \(373\;K\)
4 \(560\;K\)
PHXI12:THERMODYNAMICS

371417 Assertion :
Efficiency of a Carnot engine increases on reducing the temperature of sink.
Reason :
The efficiency of a carnot engine is defîned as ratio of net mechanical work done per cycle by the gas to the amount of heat energy absorbed per cycle from the source.

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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PHXI12:THERMODYNAMICS

371414 Carnot engine cannot give \(100\,\% \) efficiency, because we cannot:

1 Find ideal sources
2 Eliminate friction
3 Reach absolute zero temperature
4 Prevent radiation
PHXI12:THERMODYNAMICS

371415 A Carnot engine takes heat from a reservoir at \(627^\circ C\) and rejects heat to a sink at \(27^\circ C.\) Its efficiency will be

1 \(3 / 5\)
2 \(1 / 3\)
3 \(2 / 3\)
4 \(200 / 209\)
PHXI12:THERMODYNAMICS

371416 A carnot engine whose low temperature reservoir is at \(7^\circ C\) has an efficiency of \(50\,\% \). It is desired to increase the efficiency to \(70\,\% \). By how many degrees should the temperature of the high temperature reservoir be increased

1 \(280\;K\)
2 \(840\;K\)
3 \(373\;K\)
4 \(560\;K\)
PHXI12:THERMODYNAMICS

371417 Assertion :
Efficiency of a Carnot engine increases on reducing the temperature of sink.
Reason :
The efficiency of a carnot engine is defîned as ratio of net mechanical work done per cycle by the gas to the amount of heat energy absorbed per cycle from the source.

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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PHXI12:THERMODYNAMICS

371414 Carnot engine cannot give \(100\,\% \) efficiency, because we cannot:

1 Find ideal sources
2 Eliminate friction
3 Reach absolute zero temperature
4 Prevent radiation
PHXI12:THERMODYNAMICS

371415 A Carnot engine takes heat from a reservoir at \(627^\circ C\) and rejects heat to a sink at \(27^\circ C.\) Its efficiency will be

1 \(3 / 5\)
2 \(1 / 3\)
3 \(2 / 3\)
4 \(200 / 209\)
PHXI12:THERMODYNAMICS

371416 A carnot engine whose low temperature reservoir is at \(7^\circ C\) has an efficiency of \(50\,\% \). It is desired to increase the efficiency to \(70\,\% \). By how many degrees should the temperature of the high temperature reservoir be increased

1 \(280\;K\)
2 \(840\;K\)
3 \(373\;K\)
4 \(560\;K\)
PHXI12:THERMODYNAMICS

371417 Assertion :
Efficiency of a Carnot engine increases on reducing the temperature of sink.
Reason :
The efficiency of a carnot engine is defîned as ratio of net mechanical work done per cycle by the gas to the amount of heat energy absorbed per cycle from the source.

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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PHXI12:THERMODYNAMICS

371414 Carnot engine cannot give \(100\,\% \) efficiency, because we cannot:

1 Find ideal sources
2 Eliminate friction
3 Reach absolute zero temperature
4 Prevent radiation
PHXI12:THERMODYNAMICS

371415 A Carnot engine takes heat from a reservoir at \(627^\circ C\) and rejects heat to a sink at \(27^\circ C.\) Its efficiency will be

1 \(3 / 5\)
2 \(1 / 3\)
3 \(2 / 3\)
4 \(200 / 209\)
PHXI12:THERMODYNAMICS

371416 A carnot engine whose low temperature reservoir is at \(7^\circ C\) has an efficiency of \(50\,\% \). It is desired to increase the efficiency to \(70\,\% \). By how many degrees should the temperature of the high temperature reservoir be increased

1 \(280\;K\)
2 \(840\;K\)
3 \(373\;K\)
4 \(560\;K\)
PHXI12:THERMODYNAMICS

371417 Assertion :
Efficiency of a Carnot engine increases on reducing the temperature of sink.
Reason :
The efficiency of a carnot engine is defîned as ratio of net mechanical work done per cycle by the gas to the amount of heat energy absorbed per cycle from the source.

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
For More Updates join with Us