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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A vapour absorption refrigeration system

Gives noisy operation
Gives quiet operation
Cools below 0°C
Requires little power consumption

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Refrigeration and Air Conditioning
In vapour compression cycle the condition of refrigerant is superheated vapour

Before entering the expansion valve
Before passing through the condenser
After passing through the expansion or throttle valve
After passing through the condenser

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

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

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Refrigeration and Air Conditioning
An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

1/e₁ + 1/e₂
e₁e₂
(e₁ + e₂)/ e₁ + e₂ - e₁e₂
e₁ + e₂

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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)

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

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Refrigeration and Air Conditioning
In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is

Dry vapour
Very wet vapour
High pressure saturated liquid
Wet vapour

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MORE MCQ ON Refrigeration and Air Conditioning

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