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Refrigeration Air Conditioning
Refrigeration Multiple Choice
Quiz 1
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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
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