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प्रश्न
State the second law of thermodynamics in terms of entropy.
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उत्तर
“For all the processes that occur in nature (irreversible process), the entropy always increases. For reversible process entropy will not change”. Entropy determines the direction in which natural processes should occur.
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संबंधित प्रश्न
A gas contained in a cylinder surrounded by a thick layer of insulating material is quickly compressed.
- Has there been a transfer of heat?
- Has work been done?
Answer in brief:
A gas contained in a cylinder surrounded by a thick layer of insulating material is quickly compressed has work been done?
Define heat engine.
Explain in detail the Carnot heat engine.
Derive the expression for Carnot engine efficiency.
A Carnot engine whose efficiency is 45% takes heat from a source maintained at a temperature of 327°C. To have an engine of efficiency of 60% what must be the intake temperature for the same exhaust (sink) temperature?
Let η1 is the efficiency of an engine at T1 = 447°C and T2 = 147°C while η2, is the efficiency at T1 = 947°C and T2 = 47°C. The ratio `eta_1/eta_2` will be ______.
Draw a neat labelled P - V diagram for a typical heat engine.
The thermal efficiency of a heat engine is 25%. If in one cycle the heat absorbed from the hot reservoir is 50000 J, what is the heat rejected to the cold reservoir in one cycle?
What is a heat engine?
