Engineering :: Refrigeration and Air conditioning
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171. |
When ammonia is used as a refrigerant in vapour compression cycle, the mass circulated per ton of refrigerating effect will be nearly |
Answer: Option A
Explanation:
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172. |
When Freon 12 is used as a refrigerant in vapour compression cycle, the mass circulated per ton of refrigerating effect will be nearly |
Answer: Option E
Explanation:
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173. |
The critical temperature for Freon 12 is |
A. |
Less than - 50?C |
B. |
Around - 20?C |
C. |
0?C |
D. |
Around 50?C |
E. |
Above 100?C |
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Answer: Option E
Explanation:
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174. |
When Freon 12 is the refrigerant, the condenser and evaporator cables are made of |
A. |
Steel |
B. |
Wrought iron |
C. |
Cast iron |
D. |
Copper |
E. |
Aluminium |
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Answer: Option D
Explanation:
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175. |
PVC tubes are used for condenser and evaporator when the refrigerant is |
A. |
Freon 12 |
B. |
Freon 22 |
C. |
Ammonia |
D. |
Sulphur dioxide |
E. |
None of the above |
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Answer: Option E
Explanation:
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176. |
In vapour absorption system using ammonia, water is required for |
A. |
Condenser only |
B. |
Absorber only |
C. |
Separator only |
D. |
Condenser and absorber |
E. |
Condenser, absorber and separator |
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Answer: Option E
Explanation:
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177. |
When ammonia is the refrigerant, which of the following will be be the material for pipe through which refrigerant flows? |
A. |
Copper |
B. |
Aluminium |
C. |
Brass |
D. |
PVC |
E. |
Cast steel or wrought iron |
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Answer: Option E
Explanation:
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178. |
The horse power per ton of refrigerating effect when ammonia is used as a refrigerant, will be nearly |
Answer: Option C
Explanation:
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179. |
Which of the following is not a property of Carbondioxide? |
A. |
Non-toxic |
B. |
Non-inflammable |
C. |
Colourless |
D. |
Pungent odour |
E. |
All of the above |
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Answer: Option D
Explanation:
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180. |
Which of the following is not a desirable property of a refrigerant? |
A. |
High critical temperature |
B. |
Low specific heat of liquid |
C. |
Low boiling point |
D. |
High specific volume of air |
E. |
All of the above |
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Answer: Option D
Explanation:
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