Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

16. 

Air refrigerator works on

A. reversed Carnot cycle
B. Bell Coleman cycle
C. both (a) and ib)
D. none of these

Answer: Option C

Explanation:

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17. 

The reciprocating refrigerant compressors are very suitable for

A. small displacements and low condensing pressures
B. large displacements and high condensing pressures
C. small displacements and high condensing pressures
D. large displacements and low condensing pressures

Answer: Option C

Explanation:

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18. 

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:

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19. 

The mass of water vapour present in __________ is called absolute humidity.

A. 1 m3 of wetair
B. 1 m3 of dry air
C. 1 kg of wet air
D. 1 kg of dry air

Answer: Option B

Explanation:

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20. 

The relative coefficient of performance is equal to

A.
B.
C. Actual C.O.P. x Theoretical C.O.P.
D. none of these

Answer: Option B

Explanation:

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