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Process Technology Equipment, 2e (NAPTA)
Chapter 11 Heat Exchangers
1) What is a primary mode of heat transfer utilized in heat exchangers?
A) Emission
B) Radiation
C) Conduction
D) Transference
2) Which of the following is NOT a type of heat exchanger?
A) Spiral
B) Rotary
C) Shell-and-tube
D) Double-pipe
3) What unit is typically used to measure heat energy?
A) Joule
B) Celsius
C) Fahrenheit
D) British thermal unit
4) What type of heat exchanger offers high reliability and is good for operations with high
fouling potential?
A) Reboilers
B) Spiral-wound
C) Double-pipe
D) Plate-and-frame
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5) What type of heat exchanger is used in low-temperature and cryogenic processes such as the
purification and liquefaction of natural gas?
A) Cold box heat exchanger
B) Spiral-wound heat exchanger
C) Air cooled heat exchanger
D) Plate-and-frame heat exchanger
6) Which of the following is an advantage of a fixed tubesheet type of shell-and-tube heat
exchanger?
A) Low cost
B) Can handle larger temperature changes
C) Better able to deal with thermal expansion
D) Reduces fouling rates
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7) What is a heat exchanger that adds heat to fluids prior to a process operation?
A) Reboiler
B) Preheater
C) Interchanger
D) Condenser
8) What is a heat exchanger that is used to convert a vapor to a liquid?
A) Reboiler
B) Preheater
C) Interchanger
D) Condenser
9) What is a flat plate to which the tubes in a heat exchanger are fixed?
A) Shell
B) Tube sheet
C) Tube bundle
D) Exchanger head
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10) What is the outer covering of a heat exchanger that retains the shell-side fluid?
A) Shell
B) Tube sheet
C) Tube bundle
D) Exchanger head
11) What are metal plates spaced along the tube bundle that hold and support the tubes in place
and direct the shell-side fluid flow across the outside of the tubes?
A) Weirs
B) Baffles
C) Tie rods
D) Finned tubing
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12) What consists of thin plates of metal that are attached to the outside of a tube to provide
additional surface area for heat transfer?
A) Weir
B) Baffles
C) Tie rods
D) Finned tubing
13) Which of the following will cause the heat transfer rate to increase?
A) The surface area decreases.
B) The heat transfer coefficient decreases.
C) The temperature difference between the fluids increases.
D) All of the above
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14) What flow type occurs when the streams on both the shell and tube sides move in the same
direction?
A) Cross flow
B) Hybrid flow
C) Parallel flow
D) Laminar flow
15) What flow type occurs when the heat exchanger has multiple passes and baffles?
A) Cross flow
B) Hybrid flow
C) Parallel flow
D) Laminar flow
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16) What is the ideal flow type for a heat exchanger?
A) Cross flow
B) Hybrid flow
C) Parallel flow
D) Turbulent flow
17) Which of the following is a solution for fouling?
A) Adjust steam
B) Hydroblasting
C) Monitor liquid level
D) Repair the tubesheet
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18) Which of the following is a cause of corrosion?
A) The removal of metal as a result of a chemical reaction within a process fluid
B) The removal of metal by impingement caused by an abrasive and/or high-velocity fluid
stream
C) Improper material of construction employed in the heat exchanger tube bundle
D) Internal wear on a pump that reduces the performance
19) Which of the following can cause tube rupture due to thermal shock?
A) Attempting to place the exchanger in service with the bleed valves open
B) Applying heat to the exchanger without following the proper warm-up procedure
C) Improper alignment of the inlet and outlet valves
D) Opening a cold fluid to a hot heat exchanger
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20) Which of the following may cause contamination to the product?
A) Attempting to place the exchanger in service with the bleed valves open
B) Operating a heat exchanger with ruptured tubes
C) Improper alignment of the inlet and outlet valves
D) Opening a cold fluid to a hot heat exchanger
21) What are often invisible but highly dangerous?
A) Abnormal pressure changes
B) High temperature readings
C) High-pressure leaks
D) Loose tubes in the tubesheet
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22) Which of the following is a step in the start-up procedure for a shell-and-tube heat exchanger
where the low temperature fluid side is being filled?
A) Open the hot side vent valve.
B) Partially open the hot side inlet valve.
C) Establish the cold stream flow to the heat exchanger.
D) Open the outlet valve on the hot side slowly until it is fully open.
23) What general maintenance task performed on heat exchangers is a procedure in which the
direction of flow through the exchanger is reversed to remove solids that have accumulated in
the heat exchanger?
A) Acidizing
B) Backwashing
C) Water blasting
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24) What general maintenance task performed on heat exchangers is a surface cleaning technique
that uses high-pressure jets of water to remove scale or other deposits from the inside of
exchanger tubes?
A) Acidizing
B) Backwashing
C) Water blasting