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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During sensible heating of air _________ decreases.

Wet bulb temperature
Specific humidity
Dry bulb temperature
Relative humidity

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Refrigeration and Air Conditioning
The evolution of heat of solution takes place in ammonia absorption plant when

Ammonia vapour is driven out of solution
Ammonia vapour goes into solution
Weak solution mixes with strong solution
Lithium bromide mixes with ammonia

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

50 kJ/kg
100 kJ/kg
25 kJ/kg
125 kJ/kg

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-135.8°C
-95.2°C
-107.7°C
-86.6°C

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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

1.2
0.2
6
5

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Refrigeration and Air Conditioning
Air conditioning means

Heating
All of these
Cooling
Dehumidifying

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