During thermodynamic equilibrium entropy is _________ in isolated system.

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

A

1, 2 and 3 only

B

2, 3 and 4 only

C

3 and 4 only

D

1, 2, 3 and 4

Assertion: In an isolated system, the entropy increases. Reason: The processes in an isolated system are adiabatic.

A

Both assertion and reason are true and the reason is the correct explanation of the assertion

B

Both assertion and reason are true but the reason is not a correct explanation of the assertion

C

Assertion is true but the reason is false

D

Both assertion and reason are false

A system of N non-interacting and distinguishable particles of spin 1 is in thermodynamic equilibrium. The entropy of the system is

A

2k_B ln N

B

3k_B ln N

C

Nk_B ln 2

D

Nk_B ln 3

Entropy of dry-saturated vapor when Sf is 0.2513 and Sfg is 4.7878, is _______ Sf – Entropy of saturated liquid at pressure p Sfg – Entropy change during vaporization

A

6.987

B

5.987

C

5.0391

D

4.776

According to entropy principle, the entropy of an isolated system can never decrease and remains constant only when the process is reversible.

A

true

B

false

Thermodynamic entropy differs from statistical mechanics entropy by a constant:

A

Critical pressure

B

Critical pressure & Boltzmann’s constant

C

Boltzmann’s constant

D

None of the Above

Thermodynamic entropy differs from statistical mechanics entropy by a constant __________

A

Critical pressure

B

Critical pressure & Boltzmann’s constant

C

Boltzmann’s constant

D

None of the mentioned

The entropy increase due to internal irreversibility is also called entropy production or entropy generation.

A

true

B

false

Extra configurational entropy can also be introduced into the surface by the formation of surface vacancies. Entropy effects γ is slightly dependent on temperature and is given as, γ = -2T+2. Calculate the entropy S from the given condition?

A

T

B

-2

C

2

D

T2

Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg.K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg.K, entropy of saturated vapour = 7.2234 kJ/kg.K) The exit condition of steam is

A

Superheated vapour

B

Partially condensed vapour with quality of 0.9

C

Saturated vapour

D

Partially condensed vapour with quality of 0.1

During thermodynamic equilibrium entropy is _________ in isolated system.

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