Q.1
##### Why multi-stage or compound VCR with intercooler is used?
• a) To improve C.O.P.
• b) To decrease the 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 reduce the volumetric efficiency
• c) To re-heat superheated refrigerant
• d) To cool the superheated refrigerant
Q.3
##### What does process 1-2 and 3-4 represent?
• a) Evaporation
• b) Compression
• c) Condensation
• d) Expansion
Q.4
##### What does process 2-3 represent?
• a) Evaporation
• b) Compression
• c) Condensation
• d) Intercooling
Q.5
##### What do PC and PE represent?
• a) Evaporator and expansion pressure
• b) Compression and expansion pressure
• c) Condenser and evaporator pressure
• d) Intercooling pressure
Q.6
##### What is the relation between mmand m3?
• a) m3 = m1 + m2
• b) m3 = m1 – m2
• c) m3 = m2 – m1
• d) m3 = m1 / m2
Q.7
##### What is the ratio of the mass of refrigerant flowing through condenser and mass of refrigerant flowing through the evaporator, i.e., m2 / m1?
• a) h2 – h6 / h3 – hf5
• b) h1 – h6 / h1 – hf5
• c) h2 – h3 / h1 – hf5
• d) h2 – h4 / h1 – hf5
Q.8
##### What is the value of C.O.P. for the following arrangement?
• a) m1 (h1 – hf5) / m1 (h2 – h1) – m2 (h4 – h3)
• b) m1 (h1 – hf5) / m1 (h2 – h1) + m2 (h4 – h3)
• c) m1 (h1 – hf5) / m1 (h2 – h1)
• d) m1 (h1 – hf5) / m2 (h4 – h3)
Q.9
##### Why is such a type of arrangement used in ammonia plants?
• a) High latent heat of vaporization
• b) Low latent heat of vaporization
• c) Medium latent heat of vaporization
• d) High toxicity