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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.

None of these
Greater than
Less than
Equal to

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Refrigeration and Air Conditioning
Ammonia is

Non-inflammable
Toxic and non-inflammable
Highly toxic and inflammable
Non-toxic

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Refrigeration and Air Conditioning
Most air cooled condensers are designed to operate with a temperature difference of

5°C
8°C
22°C
14°C

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Can be avoided by proper design
Results in loss of heat due to poor heat transfer
Is immaterial
Increases heat transfer rate

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Refrigeration and Air Conditioning
The curved lines on a psychrometric chart indicates

Dew point temperature
Wet bulb temperature
Relative humidity
Dry bulb temperature

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

Brass
Copper
Steel
Aluminium

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