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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

Freon-22
NH3
CO2
Freon-12

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Refrigeration and Air Conditioning
Vertical lines on pressure-enthalpy chart show constant

Total heat lines
Pressure lines
Entropy lines
Temperature lines

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Refrigeration and Air Conditioning
Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

1: 3
1: 9
1: 1
9: 1

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Refrigeration and Air Conditioning
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

Humidity ratio
Degree of saturation
Relative humidity
Absolute humidity

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Refrigeration and Air Conditioning
Which of the following statement is correct for ammonia as a refrigerant?

It reacts with copper and its alloys.
All of these
It is toxic to mucous membranes.
It requires large displacement per TR compared to fluoro carbons.

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Refrigeration and Air Conditioning
The condition of refrigerant as it leaves the compressor in a vapour compression system is

Dry saturated vapour
Superheated vapour
Wet vapour
Saturated liquid

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MORE MCQ ON Refrigeration and Air Conditioning

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