Deck 20: Heat Exchangers

Question 1

What is the flow of heat through a solid?

A) Convection
B) Conduction
C) Radiation
D) Laminar

Answer 1

B
Explanation: A) Incorrect. Convection is the transfer of heat through a fluid medium.
B) Correct. Conduction is the flow of heat through a solid.
C) Incorrect. Radiation is the transfer of heat through space.
D) Incorrect. Laminar is the condition in which the fluid flow is smooth and unbroken.

Question 2

What equipment hazard can result from the improper operation of alignment?

A) Metal stress from thermal shock
B) Overheating, tube fouling, or melting
C) Possible damage if the safety valve is not working properly
D) Overpressurizing the heat exchanger

Answer 2

B
Explanation: A) Incorrect. Metal stress from thermal shock can be caused by applying heat to the exchanger without following the proper warm-up procedure.
B) Correct. Overheating, tube fouling, or melting can be caused by misalignment.
C) Incorrect. Possible damage if the safety valve is not working properly can be caused by operating a heat exchanger with ruptured tubes.
D) Incorrect. Overpressurizing the heat exchanger can be caused by opening a cold fluid to a hot heat exchanger.

Question 3

What is the ideal flow type in a heat exchanger?

A) Laminar
B) Turbulent
C) Parallel
D) Cross flow

Answer 3

B
Explanation: A) Incorrect. The ideal flow type in a heat exchanger is turbulent flow because it provides more mixing and better heat transfer.
B) Correct. The ideal flow type in a heat exchanger is turbulent flow because it provides more mixing and better heat transfer.
C) Incorrect. The ideal flow type in a heat exchanger is turbulent flow because it provides more mixing and better heat transfer.
D) Incorrect. The ideal flow type in a heat exchanger is turbulent flow because it provides more mixing and better heat transfer.

Question 4

What component of a heat exchanger holds the tubes in a tube bundle apart so they do not touch one another?

A) Baffles
B) Tube sheet
C) Tube bundle
D) Spacer rods

Question 5

What is the most common type of heat exchanger?

A) Shell and tube
B) Fin fan
C) Reboiler
D) Double pipe

Question 6

Which of the following is a benefit of baffles?

A) They support the tubes
B) They increase turbulent flow and heat transfer rates
C) They reduce hot spots
D) All of the above

Question 7

What application of heat exchangers is used to supply the necessary column heat?

A) Reboiler
B) Preheater
C) Chiller
D) Condenser

Question 8

What component of a heat exchanger are partitions located inside a shell and tube heat exchanger that increase turbulent flow and reduce hot spots?

A) Baffles
B) Tube sheet
C) Tube bundle
D) Spacer rods

Question 9

What is used for the largest temperature differentials?

A) Single pass shell exchanger
B) Floating head heat exchanger
C) Multipass heat exchanger
D) U-tube exchanger heat exchanger

Question 10

What should a process technician inspect when a heat exchanger is disassembled?

A) Leaky tubes
B) Tube sheet
C) Divider plate
D) All of the above

Question 11

What component of a heat exchanger is a group of fixed or parallel tubes through which process fluids are circulated?

A) Baffles
B) Tube sheet
C) Tube bundle
D) Spacer rods

Question 12

What type of heat exchanger is air-cooled and works like a radiator in a car?

A) Reboiler
B) Fin fan
C) Plate and frame
D) Double pipe

Question 13

Which improper operation can lead to exposure to chemicals or steam?

A) Putting the exchanger online with the bleeder valve open on process side
B) Applying heat to the exchanger without following the proper warm-up procedure
C) Operating a heat exchanger with ruptured tubes
D) All of the above

Question 14

What type of heat exchanger has a series of thin plates separating the two fluids?

A) Reboiler
B) Fin fan
C) Plate and frame
D) Double pipe

Question 15

What shell and tube heat exchanger can accommodate a slightly larger heat differential?

A) Single pass shell exchanger
B) Floating head heat exchanger
C) Multipass heat exchanger
D) U-tube exchanger heat exchanger

Question 16

In what flow pattern do the two materials enter the exchanger at separate ends and flow against each other in a counter flow?

A) Parallel
B) Cross flow
C) Counter flow
D) Exchange flow

Question 17

In what flow pattern do both materials flow in the same direction?

A) Parallel
B) Cross flow
C) Counter flow
D) Exchange flow

Question 18

What is designed to remove fouling in cooling water with bursts of compressed air?

A) Back-flushing
B) Back-rushing
C) Air-rumble
D) Air-flushing

Question 19

Which improper operation can lead to spill to the environment?

A) Putting the exchanger online with the bleeder valve open on process side
B) Applying heat to the exchanger without following the proper warm-up procedure
C) Operating a heat exchanger with ruptured tubes
D) All of the above

Question 20

What application of heat exchangers is used to remove from the system excess heat that is generated by the process?

A) Chiller
B) Aftercooler
C) Preheater
D) Condenser

Question 21

Which of the following is a heat exchanger symbol for a condenser?

A)
B)
C)
D)