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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The lowest temperature during the cycle in a vapour compression system occurs after

Compression
Condensation
Evaporation
Expansion

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Refrigeration and Air Conditioning
The condition of refrigerant after passing through the condenser in a vapour compression system is

Dry saturated vapour
Saturated liquid
Wet vapour
Superheated vapour

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

15 bar
2 bar
8 bar
30 bar

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Refrigeration and Air Conditioning
Reducing suction pressure in refrigeration cycle

Lowers evaporation temperature
Increases power required per ton of refrigeration
All of these
Lowers compressor capacity because vapour is lighter

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Refrigeration and Air Conditioning
Moisture in Freon refrigeration system causes

Ineffective refrigeration
Freezing automatic regulating valve
High power consumption
Corrosion of whole system

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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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MORE MCQ ON Refrigeration and Air Conditioning

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