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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The temperature of ammonia after compression in a vapour compression system is

None of these
50 to 70°C
70 to 110°C
20 to 50°C

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Refrigeration and Air Conditioning
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

Condensation of the refrigerant vapour
Compression of the refrigerant vapour
Evaporation of the refrigerant liquid
Metering of the refrigerant liquid

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Refrigeration and Air Conditioning
One ton refrigeration corresponds to

80 kcal/ min
80 kcal/ hr
50 kcal/ min
50 kcal/ hr

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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)

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

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Refrigeration and Air Conditioning
In vapour compression refrigeration system, refrigerant occurs as liquid between

Expansion valve and evaporator
Compressor and condenser
Condenser and expansion valve
Compressor and evaporator

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Refrigeration and Air Conditioning
The thermostatic expansion valve is used in ________ type of evaporators.

None of these
DX coil
Flooded
Dry

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