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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

Greater than
Less than
Equal to
None of these

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

cooling below 0°C
very little power consumption
noisy operation
quiet operation

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Refrigeration and Air Conditioning
The colour of the flame of halide torch, in case of leakage of Freon refrigerant, will change to

Bright green
Orange
Yellow
Red

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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
The capillary tube, as an expansion device, is used in

Water coolers
Domestic refrigerators
All of these
Room air conditioners

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Refrigeration and Air Conditioning
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

6
0.2
1.2
5

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