Q.1
Why is multi-stage or compound VCR with water intercooler, liquid sub-cooler, and flash intercooler used?
  • a) To improve C.O.P.
  • b) To decrease refrigeration effect
  • c) To increase work
  • d) To increase leakage loss
Q.2
What is the purpose of using intercooler?
  • a) To increase the cost of the compressor
  • b) To cool the superheated refrigerant
  • c) To re-heat superheated refrigerant
  • d) To reduce the volumetric efficiency
Q.3
What is the purpose of using liquid sub-cooler?
  • a) To increase the cost of the compressor
  • b) To reduce the volumetric efficiency
  • c) To re-heat superheated refrigerant
  • d) To increase the refrigeration effect
Q.4
What is the purpose of using a flash intercooler?
  • a) To increase pressure
  • b) To decrease pressure
  • c) To separate vapor and liquid refrigerant and de-superheat
  • d) To evaporate refrigerant partially
Q.5
What does process 1-2 and 4-5 represent?
  • a) Evaporation
  • b) Compression
  • c) Condensation
  • d) Expansion
Q.6
What does process 2-3 represent?
Questionrefrigeration-air-conditioning-questions-answers6.jpg
  • a) Evaporation
  • b) Compression
  • c) Intercooling
  • d) Condensation
Q.7
What do PC, PE, and PF represent?
Questionrefrigeration-air-conditioning-questions-answers7.jpg
  • a) Evaporator, expansion and flash chamber pressure
  • b) Compression, expansion and flash chamber pressure
  • c) Condenser, evaporator and flash chamber pressure
  • d) Intercooling pressure
Q.8
What does process 3-4 represent?
Questionrefrigeration-air-conditioning-questions-answers8.jpg
  • a) Separation of refrigerant and de-superheating
  • b) Compression
  • c) Mixing of refrigerants
  • d) Condensation
Q.9
What does process 6-7 represent?
Questionrefrigeration-air-conditioning-questions-answers9.jpg
  • a) Evaporation
  • b) Compression
  • c) Mixing of refrigerant coming from the flash chamber
  • d) Sub-cooling
Q.10
What do process 7-8 and 9-represent?
Questionrefrigeration-air-conditioning-questions-answers10.jpg
  • a) Expansion
  • b) Compression
  • c) Mixing of refrigerant coming from the flash chamber
  • d) Sub-cooling
Q.11
What does process 8-9 and 8-4 represent?
Questionrefrigeration-air-conditioning-questions-answers11.jpg
  • a) Expansion
  • b) Separating the vapor and liquid form of refrigerant
  • c) Compression
  • d) Sub-cooling
Q.12
What is the ratio of m2 / m1 for the following arrangement?
Questionrefrigeration-air-conditioning-questions-answers12.jpg
  • a) (h1 – hf6) / (h2 – h1) – (h4 – h3)
  • b) (h1 – hf6) / (h2 – h1) + (h4 – h3)
  • c) (h8 – hf10) / (h9 – hf10)
  • d) (h3 – hf9) / (h4 – h8)
Q.13
What is the value of work done for the following arrangement?
Questionrefrigeration-air-conditioning-questions-answers13.jpg
  • a) m1 (h2 – h1) + m2 (h4 – h3)
  • b) (h1 – hf10) / (h4 – h9)
  • c) (h8 – hf10) / (h9 – hf10)
  • d) m1 (h2 – h1) + m2 (h5 – h4)
Q.14
What is the value of work done for the following arrangement?
Questionrefrigeration-air-conditioning-questions-answers14.jpg
  • a) m1 (h1 – hf9) / m1 (h2 – h1) + m2 (h5 – h4)
  • b) m3 (h1 – hf10) / m2 (h4 – h9)
  • c) m2 (h8 – hf10) / m1 (h9 – hf10)
  • d) m1 (h1 – h11) / m1 (h2 – h1) + m2 (h5 – h4)
Q.15
What is the value of Refrigeration effect if m1 = 4 kg/min, and enthalpies for the point9 areandkJ/kg. If the refrigeration effect iskJ/min and work done iskW, then what is the value of C.O.P.?
Questionrefrigeration-air-conditioning-questions-answers15.jpg
  • a) 4.85
  • b) 5.50
  • c) 4.75
  • d) 6.00
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