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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The specific humidity during cooling and dehumidification

Remains constant
Decreases
Increases
None of these

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

None of these
Non-frosting evaporator
Defrosting evaporator
Frosting evaporator

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Refrigeration and Air Conditioning
The condition of refrigerant after passing through the condenser in a vapour compression system is

Superheated vapour
Dry saturated vapour
Saturated liquid
Wet vapour

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Refrigeration and Air Conditioning
In Electrolux refrigerator

Ammonia is absorbed in water
Hydrogen evaporates in ammonia
Ammonia is absorbed in hydrogen
Ammonia evaporates in hydrogen

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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)

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

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Refrigeration and Air Conditioning
The coefficient of performance is the ratio of the refrigerant effect to the

Work done by compressor
Heat of compression
Enthalpy increase in compressor
All of these

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MORE MCQ ON Refrigeration and Air Conditioning

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