13 - 9

Question 1

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

Answer 1

D) All of the above page 1

Question 2

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

Answer 2

A) Stainless steel page 4

Question 3

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

Answer 3

C) Resist acid corrosion and cavitation page 4

Question 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

Answer 4

D) All three page 6

Question 5

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

Answer 5

B) Outside lever and weight page 8 & 9

Question 6

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

Answer 6

C) Prevent hydraulic shock cause by water hammer page 12

Question 7

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

Answer 7

D) Blow off valve page 20

Question 8

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

Answer 8

A) Needle valve page 33

Question 9

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

Answer 9

D) Paradox page 46

Question 10

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

Answer 10

D) Paradox Gates Page 49 & 53

Question 11

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

Answer 11

B) Pressure page 5

Question 12

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

Answer 12

D) Steam page 5

Question 13

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

Answer 13

B) Loss; reduction page 6

Question 14

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

Answer 14

C) Flanged page 6

Question 15

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

Answer 15

B) Globe; throttling page 8

Question 16

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

Answer 16

A) Stem page 12

Question 17

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

Answer 17

C) Diaphragm valve page 16

Question 18

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

Answer 18

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

Question 19

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

Answer 19

D) Hydraulic page 26

Question 20

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

Answer 20

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