
Valves BOT
Authored by Andrew Garner
Science
9th Grade - University
29 Questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A main steam system uses a combination of safety valves and relief valves for overpressure protection. Which one of the following describes a major design consideration for installing both types of valves in the same system?
The safety valves are installed to prevent chattering of the relief valves during normal power
operation.
The safety valves are installed to prevent unnecessary opening of the relief valves during a steam
pressure transient.
The relief valves are installed to prevent chattering of the safety valves during normal power
operation.
The relief valves are installed to prevent unnecessary opening of the safety valves during a steam
pressure transient.
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Which one of the following describes the function of a safety valve?
Provide overpressure protection to limit the internal pressure in vessels.
Control pressure in a system to maintain optimum operational conditions.
Sound a warning by lifting at a predetermined value slightly higher than operating pressure.
Modulate open as necessary to maintain system pressure and/or temperature within normal limits.
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
The primary purpose of a pressure relief valve is to...
reduce system energy.
reduce system pressure.
maintain system integrity.
maintain system mass.
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
The difference between the setpoint pressure at which a safety valve opens and the pressure at which it closes is called...
blowdown
accumulation
setpoint tolerance
setpoint deviation
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
The difference between the setpoint pressure at which a relief valve begins to open and the pressure at which it is fully open is called...
setpoint deviation
setpoint tolerance
accumulation
blowdown
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Which one of the following is a difference between a typical relief valve and a typical safety valve?
The actuator closing spring on a relief valve is in a compressed state whereas the actuator closing
spring on a safety valve acts in tension.
A relief valve gradually opens as pressure increases above the setpoint pressure whereas a safety
valve pops open at the setpoint pressure.
Relief valves are capable of being gagged whereas safety valves are not.
The blowdown of a relief valve is greater than the blowdown of a safety valve.
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
In a comparison between a globe valve and a gate valve in the same water system application, the gate
valve has a __________ pressure drop when fully open and is the __________ choice for throttling.
higher; better
lower; better
higher; poorer
lower; poorer
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