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Refrigeration and Air Conditioning

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

Less than
Equal to
Greater than
None of the listed here

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

15 bar
30 bar
2 bar
8 bar

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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

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

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Refrigeration and Air Conditioning
A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

Dirty condenser surface
Lack of cooling water
Water temperature being high
All of these

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Refrigeration and Air Conditioning
The pressure at the inlet of a refrigerant compressor is called

Back pressure
Suction pressure
Discharge pressure
Critical pressure

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Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Much above critical pressure
Near critical pressure
Much below critical pressure
Critical pressure of refrigerant

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MORE MCQ ON Refrigeration and Air Conditioning

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