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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

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

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 Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be
[A].

1.33

[B].

2.33

[C].

3.33

[D].

4.33

Answer: Option B

Explanation:

No answer description available for this question.

A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)
[A].

25 kJ/kg

[B].

50 kJ/kg

[C].

l00 kJ/kg

[D].

125 kJ/kg

Answer: Option B

Explanation:

No answer description available for this question.

A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg) Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be
[A].

1 kW

[B].

2 kW

[C].

3 kW

[D].

4 kW

Answer: Option D

Explanation:

No answer description available for this question.

A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be
[A].

1/4

[B].

1/3

[C].

3

[D].

4

Answer: Option D

Explanation:

No answer description available for this question.

A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

The capacity of a domestic refrigerator is in the range of

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: The capacity of a domestic refrigerator is in the range of
[A].

0.1 to 0.3 TR

[B].

1 to 3 TR

[C].

3 to 5 TR

[D].

5 to 7 TR

Answer: Option A

Explanation:

No answer description available for this question.

The capacity of a domestic refrigerator is in the range of Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.
[A].

same

[B].

lower

[C].

higher

Answer: Option C

Explanation:

No answer description available for this question.

The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning