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Heat Transfer

In aircraft, air refrigeration Cycle is used because of

Heat Transfer, Mechanical Engineering, 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.

In aircraft, air refrigeration Cycle is used because of Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

In a reversed Brayton cycle, the heat is absorbed by the air during

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

In a reversed Brayton cycle, the heat is absorbed by the air during Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

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.

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

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. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

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.

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

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. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

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

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

If the evaporator temperature is kept constant, the coefficient of performance of a refrigeration cycle __________ with the increase in condenser temperature. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

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

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

In a refrigerating machine, heat rejected is __________ heat absorbed.

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

In a refrigerating machine, heat rejected is __________ heat absorbed. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

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

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T1 = Lowest absolute temperature, and T2 = Highest absolute temperature) Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning