13 - 9 Flashcards

1
Q

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

A

D) All of the above page 1

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2
Q

What kind of metal offers the greatest resistance to cavitation? A) Stainless steel
B) Brass
C) Bronze D) Monel

A

A) Stainless steel page 4

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3
Q

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

A

C) Resist acid corrosion and cavitation page 4

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4
Q

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

A

D) All three page 6

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5
Q

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

A

B) Outside lever and weight page 8 & 9

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6
Q

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

A

C) Prevent hydraulic shock cause by water hammer page 12

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7
Q

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

A

D) Blow off valve page 20

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8
Q

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

A) Needle valve page 33

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9
Q

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

A

D) Paradox page 46

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10
Q

All of the below valves are normally used for Crest control except:
A) Radial Gates B) Cylinder Gates C) Sliding Gates D) Paradox Gates

A

D) Paradox Gates Page 49 & 53

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11
Q

Valves are rated according to the __________ and temperature they are designed to handle. A) Size B) Pressure C) Material D) Fluid

A

B) Pressure page 5

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12
Q

The highest working pressure rating used for valves is? A) Water B) Oil
C) Gas D) Steam

A

D) Steam page 5

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13
Q

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

A

B) Loss; reduction page 6

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14
Q

What type of connection would you used on a large valves? A) Threaded
B) Welded
C) Flanged
D) Soldered

A

C) Flanged page 6

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15
Q

A_____ valve have an “S” shaped path and is used for ______ flow.
A) Plug; Regulating B) Global; Throttling C) Ball; Checking D) Butterfly; Full

A

B) Globe; throttling page 8

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16
Q

Stem packing is used to prevent fluid from leaking between the valve ______ and the valve body. A) Stem B) Inlet C) Seat D) Outlet

A

A) Stem page 12

17
Q

Which valve does not require packing? A) Globe valve B) Gate valve C) Diaphragm valve D) Butterfly valve

A

C) Diaphragm valve page 16

18
Q

Air vent valves include?
A) Ball float valve, Vacuum breakers, Balance valve, Safety and relief valves B) Ball float valve, Vacuum breakers, coffin air valve, safety and relief valves C) Ball float valve, Vacuum breakers, coffin air valve, safety and pressure reducing valves D) Blow off valve, Vacuum breakers, coffin air valve, safety and relief valves

A

B) Ball float valve, Vacuum breakers, coffin air valve, safety relief valves page 20 & 24

19
Q

Piston operated valves require___________ Pressure to operate.
A) Pneumatic B) Spring
C) Gas D) Hydraulic

A

D) Hydraulic page 26

20
Q

Needle valves are used for? A) Regulating flow B) Shut off valve C) Impulse Wheels D) All of the above

A

D) All of the above page 38, 41 & 46