Engineering :: Refrigeration and Air conditioning
|
|
|
|
|
31. |
Defrosting in a refrigerator may be done by |
A. |
Stopping the compressor for a while |
B. |
Opening the door of refrigerator |
C. |
Placing trays of warm water in the refrigerator |
D. |
Any of the above |
E. |
None of the above |
|
|
Answer: Option D
Explanation:
|
32. |
A thermometer installed, in a vapour compression ammonia system, after the condenser shows elevated reading than the normal. It shows that |
A. |
Condenser needs cleaning |
B. |
Cooling tower or spray pond not handling the load properly |
C. |
Uneven water distribution over the condensing surfaces |
D. |
Any of the above |
E. |
None of the above |
|
|
Answer: Option D
Explanation:
|
33. |
In ammonia vapour compression system the temperature rise between the condenser outlet and the expansion valve should be |
A. |
As high as possible to improve the performance |
B. |
As high as possible to reduce motor power inputs |
C. |
As little as possible for better performance |
D. |
Anything as it has no bearing on the performance of system |
E. |
None of the above |
|
|
Answer: Option C
Explanation:
|
34. |
In a vapour compression refrigeration cycle using ammonia as a refrigerant the temperature of ammonia after compression will be at the range |
A. |
? 15?C to - 40?C |
B. |
0?C to - 15?C |
C. |
40?C to 0?C |
D. |
50?C to 40?C |
E. |
70?C to - 110?C |
|
|
Answer: Option E
Explanation:
|
35. |
In a vapour compression cycle the lowest temperature occurs in |
A. |
Compressor |
B. |
Expansion valve |
C. |
Condenser |
D. |
Receiver |
E. |
Evaporator |
|
|
Answer: Option E
Explanation:
|
36. |
The most common type of vapour absorption system in use for industrial application is |
A. |
Freon 12 and water |
B. |
Freon 22 and water |
C. |
Ammonia and water |
D. |
Brine and water |
E. |
Hydrogen and water |
|
|
Answer: Option C
Explanation:
|
37. |
In a vapour absorption system as compared to vapour compression system, the compressor is replaced by |
A. |
Evaporator |
B. |
Receiver |
C. |
Expansion valve |
D. |
Conderser |
E. |
Absorber and generator |
|
|
Answer: Option E
Explanation:
|
38. |
The moisture in a refrigeration system is removed by |
A. |
Driers |
B. |
Dehumidifiers |
C. |
Evaporators |
D. |
Coolers |
E. |
None of the above |
|
|
Answer: Option A
Explanation:
|
39. |
A refrigerant with lowest freezing point temperature is |
A. |
Freon 11 |
B. |
Freon 12 |
C. |
Freon 22 |
D. |
Ammonia |
E. |
Carbondioxide |
|
|
Answer: Option C
Explanation:
|
40. |
The condition of refrigerant before and after compression in vapour compression cycle is |
A. |
Wet vapour, cry saturated vapour |
B. |
Liquid, wet vapour |
C. |
Dry saturated vapour, superheated vapour |
D. |
Dry saturated vapour, liquid |
E. |
Wet vapour, wet vapour |
|
|
Answer: Option A
Explanation:
|
Read more:
|
|