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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
None of these
Greater than

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Refrigeration and Air Conditioning
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Reversed Otto cycle
Reversed Brayton cycle
Reversed Carnot cycle
Reversed Joule cycle

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Refrigeration and Air Conditioning
Condensing temperature in a refrigerator is the temperature

Of freezing zone
Of cooling medium
At which refrigerant gas becomes liquid
Of evaporator

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Refrigeration and Air Conditioning
The heat rejection factor (HRF) is given by

1 - (1/C.O.P)
1 - C.O.P.
1 + (1/C.O.P)
1 + C.O.P

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Refrigeration and Air Conditioning
Aqua ammonia is used as refrigerant in the following type of refrigeration system

Absorption
Compression
Direct
Indirect

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Refrigeration and Air Conditioning
Which of the following refrigerant has the highest freezing point.

Ammonia
R-12
Carbon dioxide
Sulphur dioxide

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