- 1(current)
Q. No.An ideal heat engine (Carnot engine) works between temperatures \(T_1\) and \(T_2\) has an efficiency \(\eta.\) The new efficiency if both the source and sink temperatures are doubled will be:
1. \(\frac{\eta}{2}\)
2. \(\eta\)
3. \(2\eta\)
4. \(3\eta\)
1. \(\frac{\eta}{2}\)
2. \(\eta\)
3. \(2\eta\)
4. \(3\eta\)
Subtopic: Â Carnot Engine |
 89%
Level 1: 80%+
Hints
The efficiency of an ideal heat engine is less than \(100\%\) because of:
| 1. | the presence of friction. |
| 2. | the leakage of heat energy. |
| 3. | unavailability of the sink at zero kelvin. |
| 4. | all of these. |
Subtopic: Â Carnot Engine |
 85%
Level 1: 80%+
Hints
A Carnot engine whose sink is at \(300~\text{K}\) has an efficiency of \(40\%.\) By how much should the temperature of the source be increased to increase its efficiency by \(50\%\) of its original efficiency?
| 1. | \(275~\text{K}\) | 2. | \(325~\text{K}\) |
| 3. | \(250~\text{K}\) | 4. | \(380~\text{K}\) |
Subtopic: Â Carnot Engine |
 64%
Level 2: 60%+
AIPMT - 2006
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