Mechanical Engineering

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

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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.

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

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

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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.

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

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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.

In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is

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Question: In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is
[A].

2.5

[B].

3.0

[C].

4.0

[D].

5.0

Answer: Option D

Explanation:

No answer description available for this question.