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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Accumulators should have adequate volume to store refrigerant charge at least

0.1
0.5
0.75
0.25

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Refrigeration and Air Conditioning
The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

(hA - h1)/ (h2 - h1)
(h1 - h2)/ (hA - h2)
(h2 - hA)/ (h1 - h2)
(hA - h2)/ (h1 - h2)

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Refrigeration and Air Conditioning
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

Dry bulb temperature
Specific humidity
Dew point temperature
Wet bulb temperature

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Refrigeration and Air Conditioning
Which of the following statement is correct for ammonia as a refrigerant?

It requires large displacement per TR compared to fluoro carbons.
It is toxic to mucous membranes.
All of these
It reacts with copper and its alloys.

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Refrigeration and Air Conditioning
An Electrolux refrigerator is called a ___ absorption system.

Two fluids
Single fluid
Three fluids
None of the listed here

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-135.8°C
-86.6°C
-107.7°C
-95.2°C

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