Engineering :: Refrigeration and Air conditioning
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21. |
Oil separator in a refrigeration cycle is installed |
A. |
Before compressor |
B. |
Between compressor and condenser |
C. |
Between condenser and evaporator |
D. |
Between condenser and expansion vlve |
E. |
Could be installed anywhere |
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Answer: Option B
Explanation:
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22. |
The leaks of refrigerant from a cycle may be detected by |
A. |
Halide torch test |
B. |
Sulphur candle test |
C. |
Soap and water test |
D. |
Any of above |
E. |
None of the above |
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Answer: Option D
Explanation:
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23. |
In halide torch test if there is leakage of refrigerant, the colour of flame with change to |
A. |
Yellow |
B. |
Red or pink |
C. |
Violet or orange |
D. |
Black or grey |
E. |
Blue or bright green |
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Answer: Option E
Explanation:
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24. |
Moisture in Freon refrigeration system causes |
A. |
Ineffective refrigeration |
B. |
Damage to compressor |
C. |
High power consumption |
D. |
Freezing of automatic regulating valve |
E. |
None of the above |
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Answer: Option D
Explanation:
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25. |
In a refrigerator system if compressor fails to operate, the probable reason could be |
A. |
Power failure |
B. |
Low voltage |
C. |
Burnt motor |
D. |
Fuse blown |
E. |
Any of the above |
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Answer: Option E
Explanation:
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26. |
In a refrigeration system, if the compressor short cycles, the probable cause could be |
A. |
Intermittent contact in electric control circuit |
B. |
Dirty or iced evaporator |
C. |
Lack of refrigerant |
D. |
Overchange of refrigerant |
E. |
Any of the above |
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Answer: Option E
Explanation:
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27. |
The condition of refrigerant before and after the condenser in a vapour compression cycle is |
A. |
Dry saturated, saturated liquid |
B. |
Dry saturated, wet vapour |
C. |
Dry saturated, dry saturated |
D. |
Wet vapour, wet vapour |
E. |
Liquid, liquid |
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Answer: Option A
Explanation:
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28. |
In electrolus refrigerator |
A. |
Ammonia is absorbed in water |
B. |
Ammonia is absorbed in hydrogen |
C. |
Hydrogen is absorbed in water |
D. |
Ammonia evaporates in hydrogen |
E. |
Hydrogen evaporates in ammonia |
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Answer: Option D
Explanation:
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29. |
In case of freon as refrigerant the pipe lines should be of |
A. |
Copper |
B. |
Brass |
C. |
Seamless steel tubes |
D. |
Stainless steel tubes |
E. |
None of the above |
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Answer: Option C
Explanation:
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30. |
Frost on cooling coils |
A. |
Increases heat transfer |
B. |
Improves COP of the system |
C. |
Reduces power consumption |
D. |
Reduces evaporator temperature |
E. |
Acts as an insulation, increasing power consumption |
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Answer: Option E
Explanation:
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