For reversible adiabatic process, change in entropy is

Entropy change in case of reversible adiabatic process is

A

Minimum

B

Zero

C

Maximum

D

Indeterminate

The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

A

R log_e 4

B

R log₁₀ 4

C

C_v log₁₀ 4

D

C_v log_e 4

The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process.

A

Isobaric

B

Isothermal

C

Adiabatic

D

None of these

During a reversible isothermal expansion of an ideal gas, the entropy change is

A

+ve

B

0

C

-ve

D

∞

What happens in a reversible adiabatic expansion process?

A

Heating takes place

B

Cooling takes place

C

Pressure is constant

D

Temperature is constant

Specific heat of a gas for a reversible adiabatic process is

A

Negative

B

Zero

C

Infinity

D

None of these

Which of the following is not correct for a reversible adiabatic process?

A

$${\text{T}}{{\text{V}}^{\gamma - 1}}$$ = constant

B

$${{\text{P}}^{1 - \gamma }}.{{\text{T}}^{\text{Y}}}$$ = constant

C

$${\text{P}}{{\text{V}}^\gamma }$$ = constant

D

None of these

What happens in a reversible adiabatic compression?

A

Heating occurs

B

Cooling occurs

C

Pressure is constant

D

Temperature is constant

High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:

A

ΔH = 0 and ΔS = 0

B

ΔH ≠ 0 and ΔS = 0

C

ΔH ≠ 0 and ΔS ≠ 0

D

ΔH = 0 and ΔS ≠ 0

A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

A

Allotropic change

B

Recrystallization

C

Heat treatment

D

Precipitation

For reversible adiabatic process, change in entropy is

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