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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In order to collect liquid refrigerant and to prevent it from going to a ________, a device known as accumulator is used at the suction of compressor.

Expansion valve
Compressor
Condenser
Evaporator

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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)

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

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Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

1.25
1
5.12
2.15

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

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Refrigeration and Air Conditioning
Critical pressure of a liquid is the pressure

Above which liquid becomes solid
Above which liquid will remain liquid
Above which liquid becomes vapour
Above which liquid becomes gas

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

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

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