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प्रश्न
State Kelvin-Planck's statement of the second law of thermodynamics.
उत्तर
Kelvin-Planck's statement: It is impossible to construct a heat engine that operates in a cycle, whose sole effect is to convert the heat completely into work. This implies that no heat engine in the universe can have 100% efficiency.
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संबंधित प्रश्न
Answer in brief.
What sets the limits on the efficiency of a heat engine?
Draw a p-V diagram and explain the concept of positive and negative work. Give one example each.
Explain the heat engine and obtain its efficiency.
Derive the expression for Carnot engine efficiency.
Explain the second law of thermodynamics in terms of entropy.
Suppose a person wants to increase the efficiency of the reversible heat engine that is operating between 100°C and 300°C. He had two ways to increase efficiency.
- By decreasing the cold reservoir temperature from 100°C to 50°C and keeping the hot reservoir temperature constant
- by increasing the temperature of the hot reservoir from 300°C to 350°C by keeping the cold reservoir temperature constant.
Which is the suitable method?
10 One mole of a van der Waals' gas obeying the equation `("P" + "a"/"V"^2)`(V - b) = RT undergoes the quasi-static cyclic process which is shown in the P-V diagram. The net heat absorbed by the gas in this process is ______
For a heat engine operating between temperatures t1 °C and t2 °C, its efficiency will be ______.
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?
