The efficiency of an ideal heat engine (Carnot heat engine) working between the freezing point and boiling point of water is:
1. \(26.8\%\)
2. \(20\%\)
3. \(6.25\%\)
4. \(12.5\%\)

Subtopic:  Carnot Engine |
 78%
Level 2: 60%+
NEET - 2018
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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:  Carnot Engine |
 64%
Level 2: 60%+
AIPMT - 2006
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An ideal gas heat engine operates in a Carnot cycle between 227ºC and 127ºC. It absorbs 6 × 104 cals of heat at higher temperatures. The amount of heat converted to work will be?
1. 4.8 × 104 cals
2. 2.4 × 104 cals
3. 1.2 × 104 cals
4. 6 × 104 cals

Subtopic:  Carnot Engine |
 74%
Level 2: 60%+
AIPMT - 2005
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