Practice Test

Question 1

The measure of a pump’s ability to convert motor brake horsepower to water horsepower is known as:

Answer 1

Pump Efficiency

Question 2

On a venturi meter, the pressure in the throat while water is moving through the meter is ______ than the pressure in the cylindrical inlet and is______

Answer 2

Lower, proportional to the square of the velocity

Question 3

How many gallons of 15% industrial liquid chlorine bleach (assume 8.5 lbs/gal) are required to disinfect a 525,000 gallon tank full of water with a 25 mg/L chlorine dosage.

Answer 3

86 gal

Question 4

Where a water line crosses beneath a railroad, the line should be laid inside a culvert pipe or steel casing that is at least _____ inches larger in diameter.

Answer 4

2

Question 5

In all but the largest systems, the greatest determining factor of the amount of storage required and size of distribution mains is:

Answer 5

Fire-flow demand

Question 6

Currently, the minimum pressure desirable in a water system is normally:

Answer 6

20 psi

Question 7

The velocity of water in pipelines and valve internals is conventionally expressed in which units?

Answer 7

fps

Question 8

In determining the required pipe size in a distribution system, velocity within the pipes considered red. Pipe velocities are normally limited to ____ ft/s.

Answer 8

5

Question 9

Domestic water service meters are called totalizing water service meters because:

Answer 9

Measure and record the total volume that passes through the meter

Question 10

What is the most common type of water serve meter?

Answer 10

Displacement

Question 11

Once of the reasons to use a hydropneumatic system is to:

Answer 11

Reduce the frequency with which a pump needs to be turned on and off.

Question 12

When a service pump sounds as if it is pumping gravel, cavitation is occurring and stopped by:

Answer 12

Restricting the discharge (e.g. valve or orifice plate)

Question 13

The five areas within a traffic control zone are, in order:

Answer 13

Advance warning, transition, buffer, work, termination

Question 14

A centrifugal pump when operating normally shows a discharge pressure of 100p venturi meter shows a flow rate of 900 gpm. The discharge pressure suddenly drops the flow rate increases to 1,300 gpm. You would suspect _____.

Answer 14

A large leak in the pump discharge line

Question 15

Many distribution systems utilize chloramines for dlsinf ecr .
the formation of TH Ms. When considering the disinfecting strength
of chorine versus chloramines an operator must realize that

Answer 15

Chloramines require a longer contact time

Question 16

The person who is assigned the responsibility of monitoring workers in a “permit required confined space” is referred to as the _______. This person must remain in position at all times

Answer 16

Site supervisor

Question 17

During or after the repaving of a street, valve-box covers must be brought up to the new street
level by using

Answer 17

Extension (“grade”) rings

Question 18

Every water utility needs a safety program. These safety programs should be organized so
that:

Answer 18

They stress that every employee realizes and accepts personal responsibility for his/her own safety and the safety of fellow employees.

Question 19

The vertical distance from the liquid supply level to the pump centerline when the supply is
below the pump called

Answer 19

Static suction lift

Question 20

The underground components of a properly installed fire hydrant are (in order from the main to
the hydrant):

Answer 20

Auxiliary valve, inlet pipe, foot-piece

Question 21

The point at which chlorine dosage satisfies the chlorine demand is called ________.

Answer 21

Breakpoint

Question 22

When constructing new underground water mains, each bend in the pipe and each valve and hydrant should have a:

Answer 22

Thrust block installed

Question 23

If a trench has been dug to install a water line and the trench is deep enough to require entry and exit with a ladder, this ladder must extend at least _______ above the trench.

Answer 23

3 feet

Question 24

The leading cause of death and injury to operators in underground construction is:

Answer 24

Lack of shoring or shoring failure

Question 25

Where should air relief valves be installed in a distribution system?

Answer 25

At the high points

Question 26

If it suspected that a water customers water meter is not giving accurate readings, the operator should:

Answer 26

Bench test the meter

Question 27

How often should a fusible plug in a chlorine cylinder be changed?

Answer 27

Never