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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Pressure of water vapour is given by

None of these
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
0.622 Pv/ (Pb - Pv)
μ/[1 - (1 - μ) (Ps/Pb)]

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

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

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Refrigeration and Air Conditioning
The specific humidity during heating and humidification process.

Decreases
Increases
None of these
Remains constant

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Refrigeration and Air Conditioning
One ton refrigeration corresponds to

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

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

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

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

20°C DBT and 80% RH
22°C DBT and 60% RH
25°C DBT and 100% RH
25°C DBT and 40% RH

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