In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?

Byadmin January 25, 2019August 16, 2021

In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?

A. high, of the order of 25°
B. as low as possible (3 to 11°C)
C. zero
D. any value
E. none of the above

Refrigeration and Air Conditioning

Ammonia is __________________?

Ammonia is __________________?

A. non-toxic
B. non-inflammable
C. toxic and non-inflammable
D. highly toxic and inflammable
E. none of the above

Read More Ammonia is __________________?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Air conditioning means

Question: Air conditioning means
[A].

cooling
[B].
heating
[C].
dehumidifying
[D].
all of these

Answer: Option D

Explanation:

No answer description available for this question.

Read More Air conditioning means
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

The boiling point of carbon dioxide is

Question: The boiling point of carbon dioxide is
[A].

-20.5°C
[B].
-50°C
[C].
-63.3°C
[D].
-78.3°C

Answer: Option D

Explanation:

No answer description available for this question.

Read More The boiling point of carbon dioxide is
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

Question: In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
[A].

it considerably reduces mass of the system
[B].
it improves the C.O.P., as the condenser is small
[C].
the positive work in isentropic expansion of liquid is very small
[D].
it leads to significant cost reduction

Answer: Option C

Explanation:

No answer description available for this question.

Read More In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.

Question: In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.
[A].

Correct
[B].
Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Read More In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.
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.

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.

Read More 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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