Water Distribution Sample Test

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The following is a five question sample of the Water Distribution Exam available to members.

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Congratulations - you have completed Water Distribution Practice Test - SAMPLE. You scored %%SCORE%% out of %%TOTAL%%. %%RATING%%

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Question 1

Which valve is used to prevent a pipe from collapsing?

A	Ball valve
B	Gate valve
C	Needle Valve
D	Vacuum relief valve

Question 1 Explanation:

The relief valve is used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire.

Question 2

Which of the following is a measurement of head?

A	gauge pressure
B	absolute pressure
C	foot-pounds
D	feet

Question 2 Explanation:

Head is expressed in units of height such as meters or feet. There are four types of head used to calculate the total head in and out of a pump: 1. Velocity head is due to the bulk motion of a fluid (kinetic energy). 2. Elevation head is due to the fluid's weight, the gravitational force acting on a column of fluid. 3. Pressure head is due to the static pressure, the internal molecular motion of a fluid that exerts a force on its container. 4. Resistance head (or friction head or Head Loss) is due to the frictional forces acting against a fluid's motion by the container.

Question 3

What is the area of a trench that is 26.7 feet long and 4.1 feet wide?

A	7 sq ft
B	109 sq ft
C	122 sq ft
D	32 sq ft

Question 3 Explanation:

To calculate the area of a rectangle multiply the length times the width.

Question 4

A 6 inch water line needs to be flushed. If the length of pipe to be flushed is 425 feet, how long will it take to flush the line at 35 gpm?

A	18 minutes
B	16 minutes
C	20 minutes
D	10 minutes

Question 5

Which of the following is typically associated with trihalomethanes?

A	Water containing organics that has been chlorinated
B	High levels of iron and manganese
C	Groundwater with high levels of inorganics
D	High levels of dissolved oxygen in raw water source

Question 5 Explanation:

Disinfection by-products (DBPs), such as trihalomethanes and haloacetic acid, result from reactions between organic and inorganic matter in water with chemical treatment agents during the water disinfection process. DBPs increase with longer exposure to residual disinfectants.

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