Water Distro 2 set 2

Free chlorine residual in water exists in two
forms.  These are

When sodium hypochlorite is dissolved in water, which of the following is formed?

The sum of a disinfectant’s demand and its residual is equal
to the

When chlorine gas is dissolved in water, two products are formed: hypochlorous acid and

The difference between the total chlorine
applied and the chlorine residual is

The device used to regulate and control the rate of feed of chlorine gas is called a

Chlorine residual is measured in the field using the

The fusible plug that is in all chlorine containers

The device that generates the vacuum conditions for chlorine gas application is called a

A chlorine leak can be detected by

A “B” repair kit is used to address equipment failures on

When chlorine gas is to be withdrawn from a one-ton container, you must use the

A chlorinator is feeding 240 pounds per day at a treatment plant operating at 24 MGD. 

What is the current chlorine dosage rate in milligrams per liter?

A treatment plant’s desired chlorine dosage rate is 3.5mg/L, and its current flow rate is 8000 gallons per minute. 

What should the pounds per day setting be on
the plant’s chlorinator?

At the top of the “hump” in the chlorine breakpoint curve,

A distribution system operator measures a total chlorine residual of
1.25 mg/L, and a free chlorine residual of 1.15 mg/L.  This indicates that

From the first rising portion of the chlorine breakpoint curve through the top of the “hump”, the predominant form of residual chlorine is

In addition to indicating that bacteria may be present, nitrite acts as a

Of the following, which will have the greatest tendency to increase
nitrification?

a.System pressures

b. Pipe materials

c.Water sources

d.Water age

e. Diurnal variation

At what point on the breakpoint curve are we most likely to encounter
trichloramines?

In nitrification, bacteria consume excess ammonia in the water and produce

A distribution system operator measures a total chlorine residual of 1.25 mg/L.  How many points on the chlorine breakpoint curve may display this residual?

When free chlorine is applied at a ratio of more than 5:1 versus
ammonia, chloramines will always be

At the top of the “hump” in the chlorine breakpoint curve, the
chlorine-to-ammonia ratio is

A small amount of free chlorine is added to a water sample, but no chlorine residual is apparent.  This is most likely due to the presence of which of the following in the raw water?

Which of the following can be added along with chlorine to form
chloramines?

The total amount of free chlorine required to reach the breakpoint is known as the chlorine

Nitrification in distribution systems using chloramines requires the presence of

A new reach of 36-inch pipe containing 0.029 million gallons needs to
be disinfected with chlorine, using 50 mg/L. 
How much chlorine gas must be applied in this procedure?

A reservoir requires 1000 pounds of chlorine gas for full
disinfection.  How many pounds of calcium
hypochlorite granules (65% available chlorine) will this procedure require?

A 1.5 million gallon reservoir requires a dosage of 10 ppm for disinfection.  How many gallons of bleach (12.5% available chlorine, 9.5 lb/gal) will this procedure require?

The total static head plus friction is a pump’s

Compared to axial flow pumps, radial flow pumps will exhibit a

The difference between water pressures upstream and downstream of a
pump when it is not in operation is known as the

The water in a pump’s packing gland serves many purposes.  Among these is that it

The purpose of the packing in a centrifugal pump is

a.                  
Comparable to a bearing since it is impregnated with lubricant

b. To prevent vibration of the shaft

c. To provide support for the impeller

d. To surround the bearings and lubricate them

e.None of the above

Which of the following is a positive displacement pump?

The practical maximum suction lift for a centrifugal pump in good condition
is

A type of pump that can cause discharge line rupture from over-pressurizing is

Pumps are primed to

A
term for the water-containing portion of a centrifugal pump is the

1.                 
Which of the
following is considered a radial flow pump?

a.                  
Rotary lobe

b.                 
Vertical turbine

c.                  
Hydraulic
diaphragm

d.                 
Air lift

e.                  
Mixed flow

Vertical turbine

A pump is operating in a flow range that provides an efficiency of 80 %.  The 50 Hp electric motor that drives this
pump has an efficiency of 90 %.  What is
the wire-to-water efficiency of this installation?

Find the motor horsepower required for a pump that must move 1200 gpm against a TDH of 150 feet, if the pump efficiency is 75% and the motor efficiency is 90%.

Find the daily cost of operation of a 100-Hp pump, assuming continuous (24-hour) operation and
an electrical cost of 20 cents per kilowatt-hour.

The formal document describing the potential impact of a hazardous material release on a utility’s neighbors, and which must be
submitted to the Federal Bureau of Investigation, is called the

Which of the following gases is toxic at the lowest concentration?

Shoring is normally required for trenches of what minimum depth?

Egress is normally required for trenches of what minimum depth?

Which of the following would be considered a primary instrument?

a. Flow meter

b.                 
Pressure sensor

c. Level detector

d.Chlorine residual analyzer

e.All of the above

All of the above

Which of the following is the most likely to be a fuel involved in a Class B fire?

A confined space that contains a material that has the
potential to engulf an entrant is

The cost of parts and labor for a new pump station is an example of

What condition must exist for an area to be considered a confined space?

a.Limited or restricted means of entry or exit

b.                 
Is large enough for a person to enter and perform work

c.Is not designated for continuous occupancy

d.All of the above

e.None of the above

The costs of maintenance labor and electricity for pump
operations are examples of

The progressive discipline procedure dictated by the Skelly process consists of

A tank has an actual water level of 26 feet, and a maximum water level of 32 feet.  What
should be the milliamp reading for the level gauge located at the tank bottom?