After maintenance ________ the valve fully, then ________ it ________-________ turn(s) to prevent metal-to-metal contact and corrosion bonding.
open, close, 1/2 - 3/4
close, open, 1/4 - 1/2
close, open, 8 - 10
open, close, 1/4 - 1/2
What is the flow in gpm from a fire hydrant through the 2-½ inch nozzle, the coefficient of roughness is 80% and the pressure is 81 psi?
Question 2 Explanation:
The ________ Manual M-14 contains a guide on selecting a backflow prevention device.
A swing check valve is a special valve because it does not have a ________.
The ________ valve has a body of flexible material that acts as the moveable element.
Open or close valves slowly to prevent water ________.
Meet local standards when selecting and installing the backflow device and its ________.
Above ground reclaimed water facilities must be color-coded ________.
Thrust blocks prevent joint separation or other damage caused by water ________.
The most common automatic level control valve is the ________ valve.
The TCEQ requires a ________ with external lever on the discharge line of a lift station pump.
double check valve
swing check valve
atmospheric vacuum breaker
The movable element of a plug valve is ________ in shape.
Atmospheric vacuum breakers must not be subjected to continuous ________.
Rotating the cone valve ________ degrees from full open closes the valve.
An easy way to designate a valve is to ________ it on a distribution map.
BPAT licensing must be renewed every ________ years.
After securing a map, ________ each valve.
To protect hydrants from vehicles, set them at least ________ feet from the curb.
The altitude valve allows water into the tank, but closes at a set ________ to prevent tank overflow.
A ________ system may use a ________ grid to identify a section and then ________ the valves in each section.
Instead of a disc or diaphragm, the movable element of a ________ valve is tapered to a fine point.
Pressure system isolation valves can be separated by no more than ________ feet along the main.
Old hydrants usually have a coefficient of roughness of________%.
Organizing a maintenance program starts with ________ of the distribution system or ________ of the plant or lift stations.
According to AWWA’s hydrant color code, green indicates ________ flow and ________ gpm.
class B/500 – 1,000
class C/< 500
class A/1,000 – 1,500
________ well lift stations must have ________ separate sump pump(s).
Calculate the water hammer force on a 5-¼ inch main valve with a residual pressure of 65 psi.
Question 27 Explanation:
Level control valves are not true ACVs because they are not ________ or hydraulically activated.
Adjusting ACV action speed prevents ________.
Main valves are heavy and may settle if not supported on a ________ pad.
There are 30 questions to complete.