Chemical Engineering Thermodynamics

Question: Work done in case of free expansion is
[A].

indeterminate

[B].

zero

[C].

negative

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Critical temperature is defined as the temperature above which a gas will
[A].

not liquify (barring exceptions).

[B].

immediately liquify.

[C].

never liquify however high the pressure may be.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Entropy change in case of reversible adiabatic process is
[A].

minimum

[B].

zero

[C].

maximum

[D].

indeterminate

Answer: Option B

Explanation:

No answer description available for this question.

Question: Work done is a
[A].

property of the system

[B].

path function

[C].

point function

[D].

state description of a system

Answer: Option B

Explanation:

No answer description available for this question.

Question: In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in
[A].

enhanced COP.

[B].

decreased COP.

[C].

no change in the value of COP.

[D].

increased or decreased COP ; depending upon the type of refrigerant.

Answer: Option A

Explanation:

No answer description available for this question.

Question: In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v2 3 m3 ) is max imum, when the value of ‘n’ is
[A].

0

[B].

1

[C].

y = 1.44

[D].

1.66

Answer: Option A

Explanation:

No answer description available for this question.

Question: Enthalpy of a gas depends upon its
[A].

temperature

[B].

mass

[C].

volume

[D].

pressure

Answer: Option A

Explanation:

No answer description available for this question.

Question: Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in
[A].

increased COP.

[B].

same COP.

[C].

decreased COP.

[D].

increased or decreased COP ; depending upon the type of refrigerant.

Answer: Option A

Explanation:

No answer description available for this question.

Question: In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respetively, the Carnot COP will be
[A].

5.2

[B].

6.2

[C].

0.168

[D].

data insufficient, can’t be found out

Answer: Option A

Explanation:

No answer description available for this question.

Question: In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when
[A].

n = y = 1.4

[B].

n = 0

[C].

n = 1

[D].

n = 1.66

Answer: Option C

Explanation:

No answer description available for this question.