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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The leakage in a refrigeration system using ammonia is detected by

Sulphur sticks
Soap and water
Halide torch
All of these

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is very wet vapour

After passing through the expansion or throttle valve
Before passing through the condenser
After passing through the condenser
Before entering the compressor

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Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

20°C DBT and 60% RH
26°C DBT and 50% RH
20°C DBT and 50% RH
26°C DBT and 60% RH

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Refrigeration and Air Conditioning
Most thermostatic expansion valves are set for a superheat of

20°C
5°C
10°C
15°C

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Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

2.15
1
1.25
5.12

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Refrigeration and Air Conditioning
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

Decrease
May increase or decrease depending on the type of refrigerant used
Increase
Remain unaffected

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MORE MCQ ON Refrigeration and Air Conditioning

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