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Refrigeration and Air Conditioning

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
5
1.2

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Refrigeration and Air Conditioning
In a psychrometric chart, specific humidity (moisture content) lines are

Vertical and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines
Horizontal and uniformly spaced

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Refrigeration and Air Conditioning
Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.

None of these
Reduce
Increase
Equalize

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Refrigeration and Air Conditioning
The advantage of dry compression is that

All of these
It results in high volumetric and mechanical efficiency
It permits higher speeds to be used
It permits complete evaporation in the evaporator

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Refrigeration and Air Conditioning
In a refrigerating machine, heat rejected is _________ heat absorbed.

Equal to
Less than
Greater than
None of these

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Refrigeration and Air Conditioning
In vapour compression refrigeration system, refrigerant occurs as liquid between

Expansion valve and evaporator
Compressor and condenser
Compressor and evaporator
Condenser and expansion valve

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