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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The coefficient of performance of Heat Pump is always ___ one.

Greater than
Less than
None of the listed here
Equal to

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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

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

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

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

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Refrigeration and Air Conditioning
In a pressure enthalpy chart, the space to the left of the saturated liquid line represents

Sub-cooled liquid region
None of the listed here
Superheated vapour region
Wet vapour region

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

8 bar
2 bar
30 bar
15 bar

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Refrigeration and Air Conditioning
Most thermostatic expansion valves are set for a superheat of

10°C
20°C
5°C
15°C

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MORE MCQ ON Refrigeration and Air Conditioning

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