August 2022

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.

Question: The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is
[A].

less

[B].

more

[C].

same

[D].

dependent on climatic conditions

Answer: Option A

Explanation:

No answer description available for this question.

Question: Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.
[A].

1st

[B].

zeroth

[C].

3rd

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Extensive properties of a thermodynamic system depend upon the __________ of the system.
[A].

specific volume

[B].

temperature

[C].

mass

[D].

pressure

Answer: Option C

Explanation:

No answer description available for this question.

Question: Work done in an adiabatic process between two states depends on the
[A].

rate of heat transmission

[B].

initial state only

[C].

end states only

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: “Dry ice” is
[A].

moisture free ice

[B].

solid helium

[C].

solid carbon dioxide

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is
[A].

[B].

[C].

[D].

Answer: Option A

Explanation:

No answer description available for this question.

Question: Air-refrigeration cycle
[A].

is the most efficient of all refrigeration cycles.

[B].

has very low efficiency.

[C].

requires relatively large quantities of air to achieve a significant amount of refrigeration.

[D].

both (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.