Advertisements
Advertisements
प्रश्न
Why does heat flow from a hot object to a cold object?
उत्तर
Because entropy increases when heat flows from a hot object to a cold object. If heat were to flow from a cold to a hot object, entropy will decrease leading to violation of second law thermodynamics.
APPEARS IN
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?
Define heat engine.
State the second law of thermodynamics in terms of entropy.
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?
For a heat engine operating between temperatures t1 °C and t2 °C, its efficiency will be ______.
A heat engine operates between a cold reservoir at temperature T2 = 400 K and a hot reservoir at temperature T1. It takes 300 J of heat from the hot re ervoir and delivers 240 J of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir has to be ______ K.
Which statement is incorrect?
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?
Mention any two elements of a heat engine.
