Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

6. 

A boot-strap air cooling system has

A. one heat exchanger
B. two heat exchangers
C. three heat exchangers
D. four heat exchangers

Answer: Option B

Explanation:

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7. 

The boiling point of __________ is -10.5°C.

A. ammonia
B. R-12
C. sulphur dioxide
D. carbon dioxide

Answer: Option C

Explanation:

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8. 

One tonne of refrigeration (1TR) means that the heat removing capacity is

A. 21 kJ/min
B. 210 kJ/min
C. 420 kJ/min
D. 620 kJ/min

Answer: Option B

Explanation:

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9. 

The operating pressure for refrigerating units using R-12 as a refrigerant is

A. 2 bar
B. 8 bar
C. 15 bar
D. 30 bar

Answer: Option B

Explanation:

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10. 

The specific humidity during heating and humidification process.

A. remains constant
B. increases
C. decreases

Answer: Option B

Explanation:

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