13 - 9 Flashcards
A program designed to improve valve care, operation and maintenance procedure will promote?
A) Plant reliability B) Plant Safety
C) Plant sufficiency D) All of the above
D) All of the above page 1
What kind of metal offers the greatest resistance to cavitation? A) Stainless steel
B) Brass
C) Bronze D) Monel
A) Stainless steel page 4
Chromium and Nickel are added to steel to improve the ability to?
A) Withstand high temperature B) Withstand heavy shock C) Resist acid corrosion and cavitation D) Accept pressure variations
C) Resist acid corrosion and cavitation page 4
Resistance of flow through a valve can be caused by? A) Metal roughness B) Protuberances inside the valve C) Change in the direction of flow D) All three
D) All three page 6
Which of the below fittings would not normally be used with a gate valve? A) Bypass line
B) Outside lever and weight C) Clean out plate D) Non-rising stem
B) Outside lever and weight page 8 & 9
All quick-opening valves should be closed slowly to? A) Prevent wear on the stem threads
B) Protect the packing from blowing out C) Prevent hydraulic shock cause by water hammer D) Prevent erosion of the seat surface
C) Prevent hydraulic shock cause by water hammer page 12
Which of the following is not a float operated valve?
A) Clayton valve
B) Air-inlet valve
C) Air-outlet valve D) Blow off valve
D) Blow off valve page 20
Which of the below valves would normally be used to regulate fluid volume in hydroelectric plant?
A) Needle valve
B) Butterfly valve C) Gate valve
D) Globe valve
A) Needle valve page 33
What type of gate valve would most likely be used to reduce as much as possible the erosive action of water flowing at high velocity through high pressure gates?
A) Taintor B) Sliding
C) Stoney
D) Paradox
D) Paradox page 46
All of the below valves are normally used for Crest control except:
A) Radial Gates B) Cylinder Gates C) Sliding Gates D) Paradox Gates
D) Paradox Gates Page 49 & 53
Valves are rated according to the __________ and temperature they are designed to handle. A) Size B) Pressure C) Material D) Fluid
B) Pressure page 5
The highest working pressure rating used for valves is? A) Water B) Oil
C) Gas D) Steam
D) Steam page 5
Pressure drop is defined as a ______ in energy; or a _________________ in pressure, in a pipeline due to the resistance in it.
A) Gain; Loss B) Loss; reduction C) Gain; Gain D) Increase; Loss
B) Loss; reduction page 6
What type of connection would you used on a large valves? A) Threaded
B) Welded
C) Flanged
D) Soldered
C) Flanged page 6
A_____ valve have an “S” shaped path and is used for ______ flow.
A) Plug; Regulating B) Global; Throttling C) Ball; Checking D) Butterfly; Full
B) Globe; throttling page 8