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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

6
1.2
0.2
5

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

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

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Refrigeration and Air Conditioning
Moisture in Freon refrigeration system causes

Freezing automatic regulating valve
High power consumption
Ineffective refrigeration
Corrosion of whole system

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

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Refrigeration and Air Conditioning
The thermostatic expansion valve operates on the changes in the

None of these
Pressure in the evaporator
Degree of superheat at exit from the evaporator
Temperature of the evaporator

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Refrigeration and Air Conditioning
The specific humidity during humidification process

Increases
Decreases
Remains constant
None of these

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