This set of Heat Transfer Operations Multiple Choice Questions & Answers (MCQs) focuses on “Condensers in Refrigeration – 1”.
1. Based on the external fluid/cooling medium, condensers can be divided into three parts. Which one of the following is not one of them?
a) Air cooled condensers
b) Water cooled condensers
c) Evaporative condensers
d) Sub-cooled liquid condensers
View Answer
Explanation: There are specifically three types of cooling systems that are either in single phase or multiple phases, they are –
- Air cooled condensers
- Water cooled condensers
- Evaporative condensers.
2. In natural convection type, heat transfer from the condenser is by buoyancy induced natural convection and radiation.
a) True
b) False
View Answer
Explanation: Yes, the given statement is true and correct, in natural convection types in which there are no turbines or fans to support the heat transfer process, the heat transfer from the condenser is thus considerably done by buoyancy induced natural convection and radiation.
3. The fin spacing is usually preferred to be ___________ to minimize the fouling effect by dust and to allow free flow of air with little resistance.
a) Large
b) Small
c) Very small
d) Joint
View Answer
Explanation: The lesser the fin spacing, the less is the turbulence and fouling as here the gases strike less frequently.
4. The surface area of natural convection type condensers is _____________ the forced convection ones for same capacity.
a) Less than
b) More than
c) Equal to
d) Very much less than
View Answer
Explanation: Forced convection condensers have agitators that keep renewing the surface and the condensation process occurs really fast. But in the case of the natural convection ones, they do not have this privilege and compensate by having a larger area.
5. In traditional Refrigerators in home appliances, what is the type of condenser used?
a) Natural convection type
b) Forced convection type
c) Furnace Type
d) Rotary condensers
View Answer
Explanation: The refrigeration systems do not have fans rather they have long coils behind their main body to lose the condensation heat.
6. In traditional Air conditioners in home appliances, what is the type of condenser used?
a) Natural convection type
b) Forced convection type
c) Flash Type
d) Rotary condensers
View Answer
Explanation: The compressor unit of the air conditioners available for domestic use have a fan to support/ fasten the cooling of the wires/coils undergoing condensation, hence they have forced convection type Condensers.
7. Which type of fins are the most commonly used fin type in condensers?
a) Annular fin
b) Plate type fins
c) Tube fin
d) Extended double pipe
View Answer
Explanation: The most commonly used fin system is the plate fin system because it provides mechanical support to the tubes as well as provide considerable hike in heat transfer area.
8. Water cooled condensers can be classified to three more categories, which one of the following is incorrect?
a) Double pipe
b) Plate type
c) Shell-and-tube type
d) Shell-and-coil type
View Answer
Explanation: In water cooled condensers water is the external fluid. Considering the type of
construction of the setup, water cooled condensers can be classified as:
i. Double pipe condensers
ii. Shell-and-coil type condensers
iii. Shell-and-tube type condensers
9. In the double pipe setup of the condenser, the refrigerant flows in the ___________
a) Shell
b) Annulus
c) Inner Tube
d) Jacket
View Answer
Explanation: The refrigerant having lesser pressure drop is always considered to be kept at the annulus side of the double pipe setup and in the tube side of as Shell-and-tube type setup.
10. Shell and coil type condensers have a capacity at around ________
a) 10 TR
b) 20 TR
c) 30 TR
d) 50 TR
View Answer
Explanation: Shell-and-coil type condensers owing to its coil setup with large area and better pressure drop handling ability, has a very large cooling capacity if used in a refrigeration system, hence the maximum of all the options is correct.
11. Double pipe water cooling condensers have a capacity at around ________
a) 10 TR
b) 20 TR
c) 30 TR
d) 50 TR
View Answer
Explanation: Double pipe water cooling condensers owing to its tube-in-tube setup with small area and good pressure drop handling ability, does not have a very large cooling capacity if used in a refrigeration system, hence the minimum of all the options is correct.
12. In the double pipe setup of the water-type condenser, the cold water flows in the ___________
a) Shell
b) Annulus
c) Inner Tube
d) Jacket
View Answer
Explanation: The refrigerant having lesser pressure drop is always considered to be kept at the annulus side of the double pipe setup and hence the cooling water in the inner tube as it faces larger pressure drops.
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.
If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]
- Practice Chemical Engineering MCQs
- Check Heat Transfer Operations Books
- Check Chemical Engineering Books
- Apply for Chemical Engineering Internship
