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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.

Equalize
Increase
Reduce
None of these

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Refrigeration and Air Conditioning
Air refrigeration operates on

Carnot cycle
Brayton cycle
Reversed Carnot cycle
Rankine’s cycle

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Commercial refrigerators
Gas liquefaction
Domestic refrigerators
Air conditioning

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Refrigeration and Air Conditioning
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

5
0.2
1.2
6

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Refrigeration and Air Conditioning
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

Heated and humidified
Cooled and humidified
Cooled and dehumidified
Heated and dehumidified

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Refrigeration and Air Conditioning
In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is

More than 10 kg
Less than 2 kg
More than or equal to 3.65 kg
There is no such consideration

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