MCQ refrigeration and Airconditioning for JE Exam Part 4
| 31. A house requires 2 × 105 kJ/h of heat for heating during winter the work done to operate heat pump is 3 × 104 kJ/h then COP will be........... |
(a) 6.66 (b) 6
(c) 66.66 (d) 0.66
| Ans : (a) |
| 32. Which of the following refrigerant is highly toxic and flammable ? (a) Ammonia (b) Carbon dioxide (c) Sulphur dioxide (d) R-12 |
| Ans : (a) |
| 33. The door of a running refrigerator inside a room was left open. Which of the following statement is correct ? |
| (a) The room will be cooled to the temperature inside the refrigerator (b) The room will be cooled slightly (c) The room will be gradually warmed up (d) The temperature of the air in the room will remain unaffected |
| Ans : (c) |
| 34. In actual refrigeration systems, the compressor handles vapour only. What is this process commonly referred to as .......... (a) Gas compression (b) Phase compression (c) Dry compression (d) Wet compression |
| Ans : (c) |
| 35. The refrigeration plants are charged by refrigerants from the cylinder at the ____. (a) suction of compressor (b) crank case of compressor
(c) 0.5 (d) 0.25
(c) Receiver (d) Evaporator Ans : (b 40. Two reversible refrigerators are arranged in series and their COP are 4 and 5 respectively. The COP of the composite refrigeration system would be:
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