Heat exchangers

1. Which type of heat exchanger uses a set of parallel tubes to transfer heat?

A) Double-pipe
B) Finned tube
C) Plate
D) Shell and tube

2. Which material is commonly used for the construction of heat exchanger tubes?

A) Aluminum
B) Steel
C) Plastic
D) Copper

3. What is used to enhance heat transfer in a heat exchanger by increasing surface area?

A) Fins
B) Gaskets
C) Valves
D) Bearings

4. What helps maintain efficient heat transfer by preventing fouling in a heat exchanger?

A) Increased pressure
B) Higher flow rate
C) Regular cleaning and maintenance
D) Less insulation

5. What is the function of the header in a shell and tube heat exchanger?

A) Distribute the fluid evenly to the tubes
B) Reduce pressure
C) Separate hot and cold fluids
D) Control temperature

6. What is meant by the term 'heat exchanger fouling'?

A) Accumulation of deposits on heat transfer surfaces
B) Increase in heat transfer rate
C) Expansion of tube material
D) Decrease in fluid velocity

7. What is the purpose of the bypass valve in a heat exchanger system?

A) Increase heat transfer
B) Regulate pressure
C) Remove air from the system
D) Control flow rate through the exchanger

8. What is the function of the expansion valve in a refrigeration system?

A) Increase the pressure of the refrigerant
B) Cool the refrigerant
C) Regulate the flow of refrigerant into the evaporator
D) Remove moisture from the system

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