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Process Technology Equipment, 2e (NAPTA)
Chapter 5 Valves
1) What type of valve is a positive shutoff valve that utilizes a gate or guillotine which, when
moved between two seats, causes a tight shutoff?
A) Gate
B) Globe
C) Check
2) Which type of valve is NOT intended for throttling?
A) Plug
B) Gate
C) Globe
D) Butterfly
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3) Which of the following is NOT a type of check valve used to control the direction of flow and
prevent process fluid contamination or damage to equipment caused by backflow?
A) Lift check valves
B) Ball check valves
C) Swing check valves
4) What type of valve is a device that uses a flow control element shaped like a hollowed-out
ball, attached to an external handle, to control flow?
A) Plug
B) Ball
C) Diaphragm
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5) What safety device is designed to open slowly if the pressure of a liquid in a closed space
exceeds a preset limit?
A) Relief valve
B) Safety valve
C) Pop valve
D) Block valve
6) Which of the following is a difference between safety valves and relief valves?
A) Safety valves are used with liquid.
B) Safety valves have a slower response time.
C) Safety valves have a larger exhaust port.
D) All of the above
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7) Which of the following is one of the most common valve conditions that a process technician
may need to investigate?
A) Throttling
B) Pluggage
C) Damage to valve seat
D) Valve stem seizure
8) What should you do if you find pluggage in a small bleed or drain?
A) Contact a supervisor.
B) Use a rod-out tool to clear the pluggage.
C) Contact the maintenance department.
D) Remove the valve and its associated piping from service.
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9) Which of the following is a cause of leakage?
A) Corrosion
B) Erosion
C) Vibration
10) Which of the following improper operations can cause off-specification product due to
improper flows?
A) Failure to clean and lubricate valve stems
B) Improper closing of a valve on a high-pressure line
C) Throttling a valve that is not designed for throttling
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11) Where is the most obvious place to look for leaks and corrosion?
A) Bonnets
B) Valve stem
C) Valve body
D) Dampers
12) Which of the following improper operations can cause valve leakage?
A) Failure to clean and lubricate valve stems
B) Improper closing of a valve on a high-pressure line
C) Throttling a valve that is not designed for throttling
D) Failure to wear proper protective equipment
