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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.

Less than
Equal to
Greater than
None of these

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Refrigeration and Air Conditioning
The freezing point of sulphur dioxide is

-135.8°C
-77.7°C
-75.2°C
-56.6°C

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Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

Corrosion of steel plates
All of these
Restriction to refrigerant flow
Freezing at the expansion valve

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

2 bar
8 bar
15 bar
30 bar

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

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

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

22°C DBT and 60% RH
25°C DBT and 100% RH
20°C DBT and 80% RH
25°C DBT and 40% RH

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