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Higher Study | Thermodynamics | Second Law of Thermodynamics and Entropy

The efficiency of Carnot cycle is maximum for
The given P-V diagram indicates the following cycle
The efficiency η of any heat engine and efficiency ηR of a reversible heat engine operating between common heat source and heat sink are related as
Perpetual motion machine of second kind violates the
Kelvin-plank law deals with
According to Kelvin – Planck statement, a perpetual motion machine
Increase in entropy of a system represents
Which of the following statements pertaining to entropy are correct? 1. The entropy of a system reaches its minimum value when it is in a state of equilibrium with its surroundings 2. Entropy is conserved in all reversible processes 3. Entropy of a substance is least in solid phase 4. Entropy of a solid solution is not zero at absolute zero temperature
What happens to entropy when a close system undergoes an irreversible process?
When the degree of randomness increases, what is the change in entropy?
The maximum theoretical work obtainable, when a system interacts to equilibrium with a reference environment, is called
The expression for efficiency of the converter shown in the figure is defined by:
The following is Boltzman's entropy formula. What does W represent in the given formula? S = k log W
If a heat engine produce work only by interacting with one source. What kind of machine is this? 
A Carnot heat pump is used to maintain a room at a temperature of 27°C, the initial temperature of the room was -4°C. The heat loss from the room in 20 kW. What is the power requirement )in kW) of the pump?
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