Refrigeration and Air Conditioning

Question: Which of the following refrigerant is highly toxic and flammable?
[A].

Ammonia

[B].

Carbon dioxide

[C].

Sulphur dioxide

[D].

R-12

Answer: Option A

Explanation:

No answer description available for this question.

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

Ammonia

[B].

Carbon dioxide

[C].

Sulphur dioxide

[D].

R-12

Answer: Option B

Explanation:

No answer description available for this question.

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

Ammonia

[B].

Carbon dioxide

[C].

Sulphur dioxide

[D].

R-12

Answer: Option B

Explanation:

No answer description available for this question.

Question: The boiling point of R-12 is about – 30°C.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: The boiling point of __________ is -10.5°C.
[A].

ammonia

[B].

R-12

[C].

sulphur dioxide

[D].

carbon dioxide

Answer: Option C

Explanation:

No answer description available for this question.

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.

Question: The boiling point of ammonia is
[A].

-10.5°C

[B].

-30°C

[C].

-33.3°C

[D].

-77.7°C

Answer: Option C

Explanation:

No answer description available for this question.

Question: Which of the following statement is correct for ammonia as a refrigerant?
[A].

It is toxic to mucous membranes.

[B].

it requires large displacement per TR compared to fluoro carbons.

[C].

It reacts with copper and its alloys.

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

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.

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.