Refrigeration and Air Conditioning

Question: In aircraft, air refrigeration Cycle is used because of
[A].

low weight per tonne of refrigeration

[B].

high heat transfer rate

[C].

low temperature at high altitudes

[D].

higher coefficient of performance

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a reversed Brayton cycle, the heat is absorbed by the air during
[A].

isentropic compression process

[B].

constant pressure cooling process

[C].

isentropic expansion process

[D].

constant pressure expansion process

Answer: Option D

Explanation:

No answer description available for this question.

Question: A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration.
[A].

same

[B].

lower

[C].

higher

Answer: Option B

Explanation:

No answer description available for this question.

Question: A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.

Question: In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is
[A].

reversed Carnot cycle

[B].

reversed Joule cycle

[C].

reversed Brayton cycle

[D].

reversed Otto cycle

Answer: Option C

Explanation:

No answer description available for this question.

Question: If the evaporator temperature is kept constant, the coefficient of performance of a refrigeration cycle __________ with the increase in condenser temperature.
[A].

increases

[B].

decreases

Answer: Option B

Explanation:

No answer description available for this question.

Question: If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: The C.O.P. of a heat pump working on a reversed Carnot cycle is
[A].

[B].

[C].

[D].

Answer: Option D

Explanation:

No answer description available for this question.

Question: In a refrigerating machine, heat rejected is __________ heat absorbed.
[A].

equal to

[B].

less than

[C].

greater than

Answer: Option C

Explanation:

No answer description available for this question.

Question: The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T1 = Lowest absolute temperature, and T2 = Highest absolute temperature)
[A].

[B].

[C].

[D].

Answer: Option A

Explanation:

No answer description available for this question.