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