Valves MCQ

Topic	Views	Activity
Refer to the drawing of a spring-loaded air-operated valve. Upon a loss of air pressure, this valve will ___	388	March 4, 2021
After an adjustment of the packing gland on a valve that had a minor packing leak, an operator attempts to operate the valve, but finds the valve is stuck ___	489	March 6, 2021
Refer to the drawing of a hydraulically-operated valve that is shown in a throttled position ___	311	March 4, 2021
Which one of the following could be responsible for the difference between the initial and current steady-state conditions for the throttled valve ___	298	March 4, 2021
Why are gate valves generally not used to throttle water flow ___	298	March 5, 2021
In a comparison between globe valves and gate valves in the same water system application, globe valves ___	303	March 5, 2021
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	233	March 5, 2021
Consider a 3-inch gate valve and a 3-inch globe valve in the same flowing water system application ___	233	March 5, 2021
In a comparison between a typical gate valve and a typical globe valve in the same water system application with both valves fully open, the gate valve has a ___ pressure drop and is normally used in ___ flow applications	271	March 5, 2021
Consider a 3-inch gate valve and a 3-inch globe valve in separate but identical operating water systems ___	283	March 5, 2021
Which one of the following is a disadvantage associated with using a gate valve, versus a globe valve, to throttle flow in a cooling water system ___	226	March 5, 2021
After an adjustment of the packing gland on a valve that had a minor packing leak, the operator attempts to operate the valve, but finds that the valve is stuck ___	247	March 5, 2021
In a comparison between gate valves and globe valves in the same water system application, gate valves ___	332	March 5, 2021
A gate valve is generally a poor choice for throttling fluid flow because ___	582	March 5, 2021
Gate valves should not be used to throttle fluid flow because ___	295	March 5, 2021
Gate valves are most often used to ___	321	March 5, 2021
Globe valves are preferred over gate valves for throttling because ___	228	March 5, 2021
Some valve positioning (drive) devices are capable of stopping the valve between a fully open and a fully closed (throttled) position ___	401	March 5, 2021
Which one of the following valves is most likely to be used in a throttling application ___	311	March 5, 2021
In a comparison between ball valves and butterfly valves in the same cooling water system application, the valve that would typically experience the greater seat leakage when fully closed with a large differential pressure is the ___ valve	328	March 5, 2021
In a comparison between ball valves and butterfly valves in the same water system application, the valve that would typically be more leak-tight when fully closed with a high differential pressure is the ___ valve	549	March 5, 2021
In a comparison between ball valves and butterfly valves in the same water system application, the valve that typically would allow more leakage when fully closed with a high differential pressure is the ___ valve	331	March 5, 2021
In a comparison between butterfly valves and ball valves, ___ valves are generally more leak- tight in high pressure applications; and ___ valves generally exhibit the smaller pressure decrease when fully open	271	March 5, 2021
Refer to the drawing of a valve ___	476	March 5, 2021
An operator attempts to close a fully-open upright manual gate valve to isolate a pump in a cooling water system that has been cooled down for maintenance ___	392	March 5, 2021
Which one of the following describes the function and use of the backseat on a manual valve ___	362	March 5, 2021
A typical check valve is designed to ___	915	March 5, 2021
Which one of the following is the type of valve used to control the direction of fluid flow through a system and prevent backflow ___	493	March 5, 2021
A stop check valve is a type of check valve that ___	458	March 5, 2021
Check valves are normally used to prevent ___	462	March 5, 2021