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Refrigeration and Air Conditioning

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
5
6
0.2

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Refrigeration and Air Conditioning
The evaporator changes the low pressure liquid refrigerant from the expansion valve into

High pressure liquid refrigerant
None of these
Low pressure vapour refrigerant
Low pressure liquid and vapour refrigerant

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Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

26°C DBT and 60% RH
20°C DBT and 50% RH
26°C DBT and 50% RH
20°C DBT and 60% RH

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

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Refrigeration and Air Conditioning
The pressure at the inlet of a refrigerant compressor is called

Back pressure
Critical pressure
Suction pressure
Discharge pressure

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

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

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MORE MCQ ON Refrigeration and Air Conditioning

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