250+ TOP MCQs on Condensers – Refrigeration Systems and Answers

Heat Transfer Operations Multiple Choice Questions 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
Answer: a

2. 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

Answer: a
Clarification: 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 the LMTD for each zone.

3. 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

Answer: a
Clarification: Fog formation can occur when the temperature of the vapour-gas mixture falls largely below the saturation temperature during the condensation process at that temperature and pressure. This happens when the properties of a vapour-gas mixture and the process conditions have far more heat than mass removed from the mixture.

4. Condensers and evaporators together form a ____________
a) Heat Exchanger
b) Refrigeration system
c) Thermocouple
d) Heating System

Answer: b
Clarification: The modern refrigeration systems use these two sets of equipments –

1. To evaporate a refrigerant liquid in evaporator to pull in heat
2. Condense the refrigerant in a condenser to release that heat