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A carnot engine is made to work between 200°C and 0°C first and, then, between 0°C and -200°C. The ratio of the efficiencies of the engine in the two cases is

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Important Questions on Thermodynamics

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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves and Thermodynamics NEET>Chapter 3 - Thermodynamics>TOPICWISE QUESTIONS>Q 63
An ideal gas heat engine operates in a carnot cycle between 227°C and 127°C. It absorbs 6 kcal at the higher temperature. The amount of heat (in kcal) converted into work is equal to 
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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves and Thermodynamics NEET>Chapter 3 - Thermodynamics>TOPICWISE QUESTIONS>Q 64
Efficiency of a carnot engine is 50% when temperature of outlet is 500 K. In order to increase its efficiency up to 60%, keeping temperature of intake the same, what should be the temperature of outlet?
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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves and Thermodynamics NEET>Chapter 3 - Thermodynamics>TOPICWISE QUESTIONS>Q 65

The P-V diagram below represents the thermodynamic cycle of an engine operating with an ideal monatomic gas. The amount of heat extracted from the source in a single cycle and the efficiency of the cycle are, respectively,

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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves and Thermodynamics NEET>Chapter 3 - Thermodynamics>TOPICWISE QUESTIONS>Q 66
A carnot engine whose efficiency is 40% takes in heat from a source, maintained at a temperature of 500 K. It is desired to have an engine of efficiency 60%. Then the intake temperature for the same exhaust (sink) temperature must be