Questions

Question 1

True/False

The presence of coliform bacteria is an indication that water is polluted and may contain disease-causing organisms.

Answer 1

True

Question 2

True/False

Disinfection removes toxic chemicals that could make water unsafe to drink

Answer 2

False

Disinfectionis the selective destruction or inactivation of pathogenic. organisms

Question 3

True/False
The Safe Drinking Water Act (SWDA) and its amendments contains specific maximum allowable levels of substance known to be hazardous to human health.

Answer 3

True

Question 4

True/False

Excessive turbidity will greatly increase the efficiency of the disinfecting chemical.

Answer 4

False

Excessive turbidity will greatly reduce the efficiency of the disinfecting chemical

Question 5

True/False
Organic reducing agents in water will react with chlorine and form chlorinated organic materials of potential Health significance.

Answer 5

True

Question 6

True/False

Free chlorine is the most commonly used distribution system disinfectant.

Answer 6

True

Question 7

True/False

The chlorine ion and hydrochloric acid both have strong disinfecting power and produce a lasting chlorine residual.

Answer 7

False

Question 8

True/False

Chlorine gas tends to increase the pH and hypochlorite tends to decrease the pH.

Answer 8

False ( Chlorine gas tends to decrease)…..

Question 9

True/False

Chlorine dioxide forms carcinogenic compounds similar to those formed by other chlorine compounds.

Answer 9

False

Chlorine dioxide does not form carcinogenic compounds ….

Question 10

True/False

The chlorine demand for groundwater changes rapidly.

Answer 10

False

Question 11

True/False

The lower the temperature, the more rapid the rate of disinfection.

Answer 11

False

The higher the temperature, the more efficiently it can be treated

Question 12

True/False
Once water from a well starts producing positive coliform results, it is very easy to correct the problem with chlorine disinfection.

Answer 12

False

Question 13

True/False

Never use water on a chlorine leak because the corrosive action of chlorine and water will always make the leak worse

Answer 13

True

Question 14

True/False

The chlorinator should operate only when the well pump is running.

Answer 14

True

Question 15

True/False

Always keep chlorine cylinders away from direct heat (steam pipes or radiators).

Answer 15

True

Question 16

True/False

Always add acid to water, never the reverse.

Answer 16

True

Question 17

True/False

Most chlorinators are more easily repaired on line then replaced

Answer 17

False

Question 18

True/False

Every good safety program begins with Corporation between the employee and the employer

Answer 18

True

Question 19

True/False

Chlorine gas can deaden your sense of smell and cause a false sense of security.

Answer 19

True

Question 20

True/False

Hypochlorite compounds can cause fires when they come in contact with Organics or other easily oxidizable substances.

Answer 20

True

Question 21

Best Answer
What are pathogenic organisms?
1. Organisms capable of causing disease.
2. Organisms known to reproduce rapidly.
3. Organisms that excite pity.
4. Organisms with the ability to degrade pollution

Answer 21

1. Organisms capable of causing disease

Question 22

Best Answer
What is disinfection?
1. The degradation of organic matter by microorganisms.
2. The destruction of volatile organic matter.
3. The selection of a form of chlorine to treat water.
4. The selective destruction or inactivation of pathogenic organisms.

Answer 22

4. The selective destruction or inactivation of pathogenic organisms.

Question 23

Best Answer
What is the purpose of the disinfection process?
1. To control corrosion
2. To destroy harmful organisms
3. To please consumer's
4. To reduce taste and odors

Answer 23

2. To destroy harmful organisms

Question 24

Best Answer 
What is the term for the amount of chlorine added to water to disinfect it?
1. Chlorine breakpoint
2. Chlorine demand
3. Chlorine dose 
4. Chlorine residual

Answer 24

3. Chlorine dose

Question 25

Best Answer What is breakpoint chlorination? A process of adding chlorine 1. To the optimum economic point 2. To the point wherecarcinogins are formed 3. To water until the chlorine demand has been satisfied 4. Until chlorine breaks out of solution

Answer 25

3. To water until the chlorine demand has been satisfied

Question 26

``` Best Answer What is the biofilm? The layer of microorganisms 1. Causing disease 2. On filter media 3. On pipeline walls 4. That plug filters ```

Answer 26

3. On pipeline walls

Question 27

Best Answer What is the danger in allowing nitrification episodes to occur in water storage or distribution systems? 1. Operators may be left with A very low or no total chlorine residual 2. Operator may discover increases in algal growths 3. Operator may have to increase leak detection program efforts 4. Operator may have to increase water production rates to compensate for unaccounted for water losses.

Answer 27

1. Operators may be left with A very low or no total chlorine residual

Question 28

``` Best Answer How is the effectiveness of the chlorine dosage used to disinfect a well determined? 1. Test for chlorine residual 2. Test for the tightness of the seal 3. Test for total coliforms 4. Test for turbidity ```

Answer 28

3. Test for total coliforms

Question 29

Best Answer When storm sewers are used to dispose of water used to disinfect mains and the water has a high chlorine residual (greater than 1mg/L), what precaution should be taken? 1. Be sure the water does NOT erode away any soil 2. Be sure the water is NOT used for irrigation 3. Be sure there is NO chlorine residual remaining when the water reaches the receiving waters (creek, river, or lake) 4. Be sure to avoid body contact with the water

Answer 29

3. Be sure there is NO chlorine residual remaining when the water reaches the receiving waters (creek, river, or lake)

Question 30

Best Answer What is a hypochlorinator? 1. Equipment that feeds chlorine solutions at a high rate 2. Equipment that feeds gaseous chlorine solutions 3. Equipment that feeds liquid chlorine (bleach) solutions 4. Equipment that feeds solid (granular) chlorine solutions

Answer 30

3. Equipment that feeds liquid chlorine (bleach) solutions

Question 31

``` Best Answer Why should the chlorine injection point never be located on the intake side of the pump? Because it will cause 1. Cavitation problems 2. Corrosion problems 3. Taste and odor problems 4. Water hammer problems ```

Answer 31

2. Corrosion problems

Question 32

Best Answer Why should the yoke of the chlorinated on a chlorine cylinder NOT be overtightened? 1. Overtightening can break the wrench 2. Overtightening can damage the yoke of the chlorinated resulting in a leak 3. Overtightening can prevent the operator from removing the yoke 4. Overtightening can strip the threads

Answer 32

2. Overtightening can damage the yoke of the chlorinated resulting in a leak

Question 33

Best Answer What is a "False positive" Chlorine residual reading? 1. When a chlorine residual is present and the residual is measured as zero mg/L 2. When coliform test are positive and there is a chlorine residual present 3. When the lab reports NO residual and there is a chlorine residual 4. When turbidity produces a positive test result when there is NO chlorine present

Answer 33

4. When turbidity produces a positive test result when there is NO chlorine present

Question 34

``` Best Answer Regular exposure to chlorine can produce what kind of chronic effect? 1. Cancerous tumors 2. Loss of hair 3. Mental deterioration 4. Permanent damage to lung tissue ```

Answer 34

4. Permanent damage to lung tissue

Question 35

``` Best Answer How can a chlorine leak be detected? By the use of 1. Ammonia 2. Caustic soda 3. Hydrochloric acid 4. Soda Ash ```

Answer 35

1. Ammonia

Question 36

``` Which types of pathogenic organisms can be transmitted by water? 1 animals 2 bacteria 3 humans 4 intestinal parasites 5 viruses ```

Answer 36

2 bacteria 4 intestinal parasites 5 viruses

Question 37

Which diseases are transmitted by intestinal parasites in water? 1. Cholera 2. Cryptosporidiosis. 3. Giardiasis 4. Salmonellosis 5. Typhoid fever

Answer 37

2. Cryptosporidiosis. | 3. Giardiasis

Question 38

What is organic matter undesirable in water being disinfected? 1. Organics can consume great amounts of disinfectants. 2. Organics can form trihalomethanes 3. Organics can form unwanted compounds. 4. Organics can provide nutrients for pathogens. 5. Organics can provide substrate for pathogens

Answer 38

1. Organics can consume great amounts of disinfectants. 2. Organics can form trihalomethanes 3. Organics can form unwanted compounds.

Question 39

What are possible sources of contaminants in water Distribution Systems? 1. Cross connections. 2. Main breaks. 3. New main installations 4. Sacrificial anodes. 5. Sequestering agents.

Answer 39

1. Cross connections. 2. Main breaks. 3. New main installations

Question 40

What are the advantages of using chlorine dioxide to disinfect drinking water? 1. Controls phenolic taste and odors 2. Does not form carcinogenic compounds 3. Not affected by ammonia 4. Reacts with sulfide compounds 5. Very effective at higher pH levels.

Answer 40

All of the above

Question 41

And operators decision to use chloramines depends on which factors? 1. Ability of the treatment plant to meet various regulations. 2. Distribution system characteristics. 3. Form of chlorine available 4, Operational practices 5. Qualitiy of the raw water

Answer 41

1. Ability of the treatment plant to meet various regulations. 2. Distribution system characteristics. 4, Operational practices 5. Qualitiy of the raw water

Question 42

What are the early warning signs that can be used to detect that nitrification is beginning to occur? 1. Decrease in ammonia. 2. Decrease in PH. 3. Decrease in total chlorine. 4. Increase and heterotrophic plate count bacteria. 5. Increase in nitrite

Answer 42

All of the above

Question 43

What are the benefits of maintaining a chlorine residual throughout the distribution system? 1. Biological control and elimination of coliform bacteria that might reach the system through cross connections 2. Biological control and elimination of coliform bacteria that might reach through leakage into the system 3. Control of corrosion 4. Control of microorganisms that could produce limes 5. Control of microorganisms that could produce taste and odors

Answer 43

1. Biological control and elimination of coliform bacteria that might reach the system through cross connections 2. Biological control and elimination of coliform bacteria that might reach through leakage into the system 4. Control of microorganisms that could produce limes 5. Control of microorganisms that could produce taste and odors

Question 44

What a new well is completed, it is necessary to disinfect which items? 1. The distribution system 2. The pump 3. The screen 4. The storage tank 5. The well

Answer 44

2. The pump 3. The screen 5. The well

Question 45

Under what conditions should water storage tanks be thoroughly cleaned before disinfecting with tank? 1. After construction 2. After inspection 3. After maintenance 4. After repairs 5. After visits

Answer 45

1. After construction 3. After maintenance 4. After repairs

Question 46

Which items should be included in a hypochlorination normal operation checklist? 1. Check chemical usage 2. Check the building for any possible problems 3. Clean up the area 4. Determine if every piece of equipment is operating 5. Inspect the lubrication of the equipment.

Answer 46

All of the above

Question 47

Which items of safety equipment are required and must be available outside the chlorinator room? 1. Chlorine leak detector/warning device 2. Chlorine residual analyzer 3. Device to measure the chlorine solution level 4. Protective clothing loves and rubber suit 5. Self-contained positive pressure/demand air supply system

Answer 47

1. Chlorine leak detector/warning device 4. Protective clothing loves and rubber suit 5. Self-contained positive pressure/demand air supply system

Question 48

What abnormal operating systems should be included in a direct-mount chlorinator troubleshooting guide? 1. Indication on Flow meter but are present, NOT chlorine gas 2. NO indication on a flow meter when vacuum is present 3. Percent of hypochlorite solution 4. Water in the chlorine meter tube 5. Water venting to atmosphere

Answer 48

1. Indication on Flow meter but are present, NOT chlorine gas 2. NO indication on a flow meter when vacuum is present 4. Water in the chlorine meter tube 5. Water venting to atmosphere

Question 49

They should be on a chlorine emergency list? 1. Chlorine many emergency Personnel 2. Chlorine supplier 3. Fire department 4. Local media 5. Police department

Answer 49

1. Chlorine many emergency Personnel 2. Chlorine supplier 3. Fire department 5. Police department

Question 50

First aid measures for persons exposed to chlorine include which items? 1. If breathing is difficult, administer oxygen if equipment and trained Personnel are available 2. If breathing seems to have stopped, begin artificial respiration immediately 3. Keep patients warm and cover them with blankets, if necessary 4. Place patients in a comfortable position on their backs. 5. Remove contaminated clothes to prevent clothing giving out chlorine gas which would irritate the body

Answer 50

All of the above

Question 51

Why are nearly all new metal water mains line with cement mortar? 1. Improve structural strength 2. Increase carrying capacity 3. Prevent corrosion 4. Prevent release of corrosion products into water 5. Reduce leakage through for joints.

Answer 51

2. Increase carrying capacity 3. Prevent corrosion 4. Prevent release of corrosion products into water 5. Reduce leakage through for joints.

Question 52

Which factors could cause deterioration in the quality of water traveling through a distribution system? 1. Age of the facilities 2. Cross connections 3. High temperatures 4. Pipe corrosion 5. Time in the system.

Answer 52

All of the above