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Refrigeration and Air Conditioning

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

30 bar
2 bar
8 bar
15 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)/ e₁ + e₂ - e₁e₂
e₁e₂
1/e₁ + 1/e₂

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Refrigeration and Air Conditioning
Chaperon equation is a relation between

Temperature, pressure and enthalpy
Specific volume and enthalpy
Temperature, pressure, specific volume and enthalpy
Temperature and enthalpy

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Refrigeration and Air Conditioning
In a vapour compression cycle, the refrigerant immediately after expansion valve is

Wet vapour
Liquid
Sub-cooled liquid
Saturated liquid

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Refrigeration and Air Conditioning
For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be

Equal
High
Small
Anything

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Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Brass
Copper
Steel
Aluminium

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MORE MCQ ON Refrigeration and Air Conditioning

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