ESE 2021 ME Technical Quiz || Second Law of Thermodynamics

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Question 1

For a given value of (Source temperature) for a reversed Carnot cycle, the variation of (Sink temperature) for different value of COP is represented by which one of the following graphs?

• A
• B
• C
• D

Question 2

A reversible engine operates between temperatures 900 K and and another reversible engine between and 400 K in series. What is the value of if efficiency of both the engines are equal?

• A600 K
• B625 K
• C650 K
• D675 K

Question 3

A cornot engine operates between and . If the engine produce 300 kJ of work, what is the magnitude of entropy change during heat addition?

• A0.5 kJ/K
• B1.0 kJ/K
• C1.5 kJ/K
• D2.0 kJ/K

Question 4

Which of the folloiwng 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 soloution is not zero at absolute zero temperature

• A1, 2 and 3
• B2, 3 and 4
• C3 and 4 only
• D1, 2, 3 and 4

Question 5

An amount of 1000 kJ of heat is added to a system during a constant pressure vapourization process at a temperature of . The available energy added to the system, if the temperature of the surroundings is , is

• A600 kJ
• B500kJ
• C400 kJ
• D300 kJ

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