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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The capillary tube, as an expansion device, is used in

All of these
Room air conditioners
Water coolers
Domestic refrigerators

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

Steel
Aluminium
Brass
Copper

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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
e₁ + e₂
e₁e₂
1/e₁ + 1/e₂

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid

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

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Refrigeration and Air Conditioning
During cooling and dehumidification, dry bulb temperature

Remains constant
Increases
Decreases
None of these

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Refrigeration and Air Conditioning
While designing the refrigeration system of an aircraft, the prime consideration is that the

Power per TR is low
System has high C.O.P.
Mass of the refrigeration equipment is low
Mass of refrigerant circulated in the system is low

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