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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Sulphur dioxide
Ammonia
Carbon dioxide
R-12

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Refrigeration and Air Conditioning
Vapour compression refrigeration is somewhat like

None of these
Reversed Carnot cycle
Carnot cycle

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

quiet operation
very little power consumption
cooling below 0°C
noisy operation

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Refrigeration and Air Conditioning
A standard ice point temperature corresponds to the temperature of

Water at 0°C
Solid and dry ice
Ice at 4°C
Mixture of ice and water under equilibrium conditions

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Refrigeration and Air Conditioning
The difference between dry bulb temperature and wet bulb temperature, is called

Wet bulb depression
Dew point depression
Dry bulb depression
Degree of saturation

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Refrigeration and Air Conditioning
In larger industrial and commercial reciprocating compression systems, refrigerant widely used is

R-12
Ammonia
Carbon dioxide
Sulphur dioxide

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