Heat Transfer Operations Questions and Answers – Condensers – Refrigeration Systems

This set of Heat Transfer Operations Multiple Choice Questions & Answers (MCQs) focuses on “Condensers – Refrigeration Systems”.

1. We divide the temperature/enthalpy diagram into a number of zones such that the curves of both the condensing stream and the coolant can be regarded as being reasonably linear.
a) True
b) False
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Answer: a
Explanation: In the thermal design of condenser it is impossible to assign a single demanding temperature difference and an overall heat transfer coefficient to the exchanger based on it, and hence we need a zonal or stepwise calculation of the surface area which is far more complicated than a HE because here we are taking linear groups of enthalpy curves for LMTD calculations.

2. Which one of the following zone breaks can be correct regarded as valid for calculations?
a)
b)
c)
d)
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3. What do we apply at these linear zones of the diagram?
a) LMTD
b) Average Temperature difference
c) T_SAT – T_LIQUID
d) T_SAT
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4. Which one of the following parameters is not used while calculating zonal heat transfer coefficients for the zones in the diagram?

a) The resistance to heat transfer due to the tube wall
b) The resistance due to the film
c) The resistance to heat transfer associated with the presence of non-condensing gases
d) The coolant heat transfer coefficient
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5. Fog formation in a condenser can occur when the temperature of the vapour-gas mixture _____________ the local saturation temperature during the condensation process.
a) Falls below
b) Goes above
c) Becomes equal to
d) Goes considerably high
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6. Condensers and evaporators together form a ____________
a) Heat Exchanger
b) Refrigeration system
c) Thermocouple
d) Heating System
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7. What does the following diagram represent?

a) Gas Cycle
b) Refrigeration cycle
c) Automobile engine cycle
d) 4stroke cycle
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8. Which process in the refrigeration diagram is represented as the heat rejection process?

a) 3-4-5-6
b) 2-3’-3-4
c) 3’-3-4-5
d) 3’-3-4
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9. What set of process on the refrigeration cycle corresponds to that of the condenser?

a) 3-4-5-6
b) 2-3’-3
c) 3’-3-4-5
d) 2-3’-3-4
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10. What set of process on the refrigeration cycle corresponds to that of the evaporator?

a) 5-6-1-2
b) 2-3’-3
c) 3’-3-4-5
d) 2-3’-3-4
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11. The process 2-3’ is known as the ______________

a) Evaporation
b) De-superheating process
c) Condensation
d) Superheating process
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12. Which one of the following pathway represents the condensation process of the refrigerant in a refrigeration cycle?

a) 2-3’
b) 3-4
c) 3′-3
d) 1-2
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13. What is the name of the process occurring represented by the line 3-4 in the given refrigeration cycle?

a) Sensible, heating process
b) Sensible, sub cooling process
c) Entropy increase step
d) Condensation
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Sanfoundry Global Education & Learning Series – Heat Transfer Operations.

To practice all areas of Heat Transfer Operations, here is complete set of 1000+ Multiple Choice Questions and Answers.