Refrigeration and Air Conditioning

For obtaining high COP, the pressure range of compressor should be_______________?

Byadmin January 25, 2019August 16, 2021

For obtaining high COP, the pressure range of compressor should be_______________?

A. high
B. low
C. optimum
D. any value
E. there is no such criterion

Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

A refrigerant with the highest critical pressure is

Question: A refrigerant with the highest critical pressure is
[A].

R-11
[B].
R-12
[C].
R-22
[D].
Ammonia

Answer: Option D

Explanation:

No answer description available for this question.

Read More A refrigerant with the highest critical pressure is
Refrigeration and Air Conditioning

A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?

A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?

A. Ammonia
B. Carbon dioxide
C. Freon
D. Brine
E. Hydrocarbon refrigerant

Read More A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?
Refrigeration and Air Conditioning

Short horizontal lines on pressure-enthalpy chart show__________________?

Short horizontal lines on pressure-enthalpy chart show__________________?

A. constant pressure lines
B. constant temperature lines
C. constant total heat lines
D. constant entropy lines
E. constant volume lines

Read More Short horizontal lines on pressure-enthalpy chart show__________________?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.

Question: In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.
[A].

True
[B].
False

Answer: Option A

Explanation:

No answer description available for this question.

Read More In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Which of the following refrigerant has the lowest freezing point?

Question: Which of the following refrigerant has the lowest freezing point?
[A].

R-11
[B].
R-12
[C].
R-22
[D].
Ammonia

Answer: Option C

Explanation:

No answer description available for this question.

Read More Which of the following refrigerant has the lowest freezing point?
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

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.

Read More 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

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