Heat Engines
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PHXI12:THERMODYNAMICS

371320 An ideal heat engine has an efficiency \(\eta\). The coefficient of performance of the engine when driven backward will be

1 \(\eta-\left(\dfrac{1}{\eta}\right)\)
2 \(1-\left(\dfrac{1}{\eta}\right)\)
3 \(\left(\dfrac{1}{1-\eta}\right)\)
4 \(\left(\dfrac{1}{\eta}\right)-1\)
PHXI12:THERMODYNAMICS

371321 A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by \(62^{\circ} \mathrm{C}\), the efficiency of the engine is doubled. The temperatures of the source and sink are:

1 \(80^\circ C,\,\,37^\circ C\)
2 \(99^\circ C,\,37^\circ C\)
3 \(90^\circ C,\,37^\circ C\)
4 \(95^\circ C,37^\circ C\)
PHXI12:THERMODYNAMICS

371322 The temperature of source and sink of a heat engine are \(127^\circ C\) and \(27^\circ C,\) respectively. An inventor claims its efficiency to be \(26 \%\), then

1 it is impossible
2 it is possible with high probability
3 it is possible with low probability
4 Data are insufficient
PHXI12:THERMODYNAMICS

371323 An engine has an efficiency of \(1 / 6\). When the temperature of sink is reduced by \(62^\circ C\), its efficiency is doubled. Temperature of the source is,

1 \(124^\circ C\)
2 \(37^\circ C\)
3 \(62^\circ C\)
4 \(99^\circ C\)
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PHXI12:THERMODYNAMICS

371320 An ideal heat engine has an efficiency \(\eta\). The coefficient of performance of the engine when driven backward will be

1 \(\eta-\left(\dfrac{1}{\eta}\right)\)
2 \(1-\left(\dfrac{1}{\eta}\right)\)
3 \(\left(\dfrac{1}{1-\eta}\right)\)
4 \(\left(\dfrac{1}{\eta}\right)-1\)
PHXI12:THERMODYNAMICS

371321 A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by \(62^{\circ} \mathrm{C}\), the efficiency of the engine is doubled. The temperatures of the source and sink are:

1 \(80^\circ C,\,\,37^\circ C\)
2 \(99^\circ C,\,37^\circ C\)
3 \(90^\circ C,\,37^\circ C\)
4 \(95^\circ C,37^\circ C\)
PHXI12:THERMODYNAMICS

371322 The temperature of source and sink of a heat engine are \(127^\circ C\) and \(27^\circ C,\) respectively. An inventor claims its efficiency to be \(26 \%\), then

1 it is impossible
2 it is possible with high probability
3 it is possible with low probability
4 Data are insufficient
PHXI12:THERMODYNAMICS

371323 An engine has an efficiency of \(1 / 6\). When the temperature of sink is reduced by \(62^\circ C\), its efficiency is doubled. Temperature of the source is,

1 \(124^\circ C\)
2 \(37^\circ C\)
3 \(62^\circ C\)
4 \(99^\circ C\)
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PHXI12:THERMODYNAMICS

371320 An ideal heat engine has an efficiency \(\eta\). The coefficient of performance of the engine when driven backward will be

1 \(\eta-\left(\dfrac{1}{\eta}\right)\)
2 \(1-\left(\dfrac{1}{\eta}\right)\)
3 \(\left(\dfrac{1}{1-\eta}\right)\)
4 \(\left(\dfrac{1}{\eta}\right)-1\)
PHXI12:THERMODYNAMICS

371321 A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by \(62^{\circ} \mathrm{C}\), the efficiency of the engine is doubled. The temperatures of the source and sink are:

1 \(80^\circ C,\,\,37^\circ C\)
2 \(99^\circ C,\,37^\circ C\)
3 \(90^\circ C,\,37^\circ C\)
4 \(95^\circ C,37^\circ C\)
PHXI12:THERMODYNAMICS

371322 The temperature of source and sink of a heat engine are \(127^\circ C\) and \(27^\circ C,\) respectively. An inventor claims its efficiency to be \(26 \%\), then

1 it is impossible
2 it is possible with high probability
3 it is possible with low probability
4 Data are insufficient
PHXI12:THERMODYNAMICS

371323 An engine has an efficiency of \(1 / 6\). When the temperature of sink is reduced by \(62^\circ C\), its efficiency is doubled. Temperature of the source is,

1 \(124^\circ C\)
2 \(37^\circ C\)
3 \(62^\circ C\)
4 \(99^\circ C\)
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PHXI12:THERMODYNAMICS

371320 An ideal heat engine has an efficiency \(\eta\). The coefficient of performance of the engine when driven backward will be

1 \(\eta-\left(\dfrac{1}{\eta}\right)\)
2 \(1-\left(\dfrac{1}{\eta}\right)\)
3 \(\left(\dfrac{1}{1-\eta}\right)\)
4 \(\left(\dfrac{1}{\eta}\right)-1\)
PHXI12:THERMODYNAMICS

371321 A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by \(62^{\circ} \mathrm{C}\), the efficiency of the engine is doubled. The temperatures of the source and sink are:

1 \(80^\circ C,\,\,37^\circ C\)
2 \(99^\circ C,\,37^\circ C\)
3 \(90^\circ C,\,37^\circ C\)
4 \(95^\circ C,37^\circ C\)
PHXI12:THERMODYNAMICS

371322 The temperature of source and sink of a heat engine are \(127^\circ C\) and \(27^\circ C,\) respectively. An inventor claims its efficiency to be \(26 \%\), then

1 it is impossible
2 it is possible with high probability
3 it is possible with low probability
4 Data are insufficient
PHXI12:THERMODYNAMICS

371323 An engine has an efficiency of \(1 / 6\). When the temperature of sink is reduced by \(62^\circ C\), its efficiency is doubled. Temperature of the source is,

1 \(124^\circ C\)
2 \(37^\circ C\)
3 \(62^\circ C\)
4 \(99^\circ C\)