1.  The pH scale runs from:

A. 0-14 B. 0-15 C. 7-10 D. 1-20

2.  A main break may cause low pressure in the distribution system, which in turn may result in:

A. contamination of the system by backsiphonage B. ice formation in the pipes C. increase in chlorine residual D. water hammer

3.  Chemicals added to a groundwater supply should be added:

A. after the check valve B. before the screen C. after elevated storage D. near the meter

4.  After all chlorine demands have been met, what is the remaining chlorine called?

A. breakpoint B. differential C. potential D. residual

5.  Corrosive chemicals are usually pumped with a:

A. plunger-type pump B. piston-type pump C. rotary-type pump D. diaphragm-type pump

6.  Hydrogen sulfide may be removed by:

A. aeration B. rapid mixing C. fluoridation D. percolation

7.  What must be replaced when connecting a new chlorine cylinder?

A. rotameter B. pressure regulator C. lead washer

8.  Turbidity is measured by:

A. SPADNS method B. the intensity of light reflected in a water sample C. DPD D. Turbulence

9.  The final step in the removal of suspended matter is:

A. breakpoint chlorination B. monitoring on-line Turbidimeters C. flocculation D. filtration

10.  What is the minimum watermain pipe diameter for fire protection?

A. 12 inch B. 8 inch C. 6 inch D. 16 inch

11.  The highest levels of lead are found:

A. after the water stands in the plumbing system B. in cold tap water C. after flushing the water system in the Spring D. in newly installed faucets

12.  The minimum distance allowed between a municipal well and a buried sewer is:

A. 10 feet B. 7 feet C. 1 foot D. 50 feet

13.  Sodium thiosulphate is used to:

A. enhance coagulation B. neutralize chlorine residuals C. measure fluoride levels D. sterilize sample bottles

14.  Distribution system pressure during a fire should never drop below:

A. 40 psi B. 20 psi C. 35 psi D. 60 psi

15.  The difference between the amount of chlorine added to water and the amount of residual chlorine found by testing at distant points of the distribution system is:

A. the maximum allowable dosage B. free available chlorine C. breakpoint chlorine D. chlorine demand

16.  A positive Langlier index reading means the water is:

A. corrosive B. scaling C. neutral

17.  The purpose of adding ammonia to drinking water is to:

A. increase the pH B. form combined chlorine residual C. remove total organic carbon D. indicate if there is a chlorine leak in the plant

18.  A device used to check flows in a distribution system is called:

A. pressure gauge B. poly pig C. flow diffuser D. pitot gauge

19.  High nitrates contents in water can affect:

A. mottled teeth B. heart disease C. infants D. taste

20.  Carbon dioxide in water will do which of the following?

A. increase filter head loss B. raise the Zeta potential C. lower pH D. remove Cationic polyelectrolytes

21.  Shut-off valves should be located in a water main of a commercial district at least every:

A. 300 feet B. 500 feet C. 800 feet D. 1000 feet

22.  What happens if an operator passes ammonia vapor near a leaking chlorine cylinder valve?

A. a gas explosion B. red vapor C. a rotten egg odor D. white smoke

23.  An operator can find the optimum coagulant dosage by:

A. performing jar tests B. determining the breakpoint of chlorination C. performing total solids tests D. observing the pilot filter

24.  Which type of pump is commonly used for feeding chemicals?

A. vertical turbine B. submersible C. centrifugal D. diaphragm

25.  When both chlorine and polyphosphate are added to a well, which should be fed first?

A. chlorine B. polyphosphate C. both added simultaneously D. either may be added first

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