| # | What is breakout of chlorination? | Addition of chlorine to wastewater until chlorine demand has been met. | A breakdown of organic matter due to the use of chlorine. | A condition when chlorine gas escapes from a cylinder due to a puncture. | A point at which chlorine leaves soulution as a gas. | none of the above | 4
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| 1 | Three waterborne diseases are | mumps, measles, cold. | scarlet fever, pneumonia, hay fever. | typhoid fever, dysentery, cholera. | tb, diphtheria, chicken pox. | none of the above. | 3 |
| 2 | Chlorine gas is | colorless. | heavier than air. | non- toxic. | odorless. | none of the above. | 2 |
| 3 | Acids should never be added to chlorine solutions as they | cause chlorine gas to be released. | corrode or ~eat away~ the solution tank. | decrease the disinfecting properties of chlorine. | result in the formation of chloride precipitates. | none of the above. | 4 |
| 4 | As water temperature decrease, the disinfecting action of chlorine | decreases. | increases. | remains the same. | all of the above. | none of the above. | 1 |
| 5 | How many pounds of chlorine gas is necessary to treat 4,000,000 gallons of wastewater at a dosage of 2 mg/l? | 61 lbs. | 65 lbs. | 67 lbs. | 69 lbs. | none of the above. | 3 |
| 6 | Chlorine is used to | disinfect. | prevent corrosion. | raise the ph. | stabilize organics. | none of the above. | 1 |
| 7 | Exhaust from a chlorinator room should be taken from | anywhere--the location is not important. | at floor level. | close to the entrance. | in the ceiling. | none of the above. | 2 |
| 8 | Which of the following would be the safest action to take in the event of a major chlorine container leak? | call fire department to hose down the container. | notify local police or sheriff. | roll the container so that liquid rather than gas escapes. | all of the above. | none of the above. | 2 |
| 9 | Chlorine residual may be determined using the reagent | diethyl-p-phenylenediamine (dpd). | ethylenediamine tetraacetic acid (edta). | polychlorinated biphenyls (pcb) | sodium thiosulfate (na2 s2 o3). | none of the above. | 1 |
| 10 | What disease is not considered to be normally conveyed or transmitted by untreated wastewater? | amoebic dysentery. | hepatitis. | malaria. | cholera | none of the above. | 3 |
| 11 | Pathogens | are bacteria or virus that cause disease. | are bacteria which do not occur in water. | can obtain their food supply with-out using Oxygen. | all of the above. | none of the above. | 1 |
| 12 | An amperometric titrator is used to measure | alkalinity. | chlorine residual. | conductivity. | cod. | none of the above. | 2 |
| 13 | Chloramines are | combined chlorine. | enzymes. | found in polluted air. | free chlorine. | none of the above. | 1 |
| 14 | Which one of the following conditions increase chlorine demand? | alkalinity increasing. | increase in organic matter. | increase in phosphate concentration. | ph increase. | none of the above. | 2 |
| 15 | The purpose of adding sodium thiosulfate to a microbiological sample bottle is to | extend the allowable holding time from 6 to 30 hours. | react with nitrates that interfere with mpn test. | remove any chlorine residual. | all of the above. | none of the above. | 3 |
| 16 | Which one of the following are normal conditions for a manual control gas chlorination system? | lines free of ice. | pressure reading slowly decreasing. | rotometer float fluctuating over a range of ten pounds per 24 hours. | vacuum gauge fluctuating over a narrow range. | none of the above. | 1 |
| 17 | Chlorine ton cylinders may be lifted using | cables. | chains. | clamps. | ropes. | pry bars | 3 |
| 18 | A chlorine leak can be detected by | an explosimeter. | checking the leak gauge. | green or reddish deposits on metal. | spraying water on suspected leaks. | none of the above. | 3 |
| 19 | Failure of the chlorine solution pumps would result in | a decrease in digester gas production. | an increase in digester gas production. | lower effluent fecal coliform counts. | none of the above. | | 4 |
| 20 | The reaction of chlorine and ammonia produces a compound which is called | ammonia chloride. | chloral hydrate. | chloramine. | hydrazine. | none of the above. | 3 |
| 21 | A malfunctioning gas chlorination system has normal gas pressure, no feed rate indicated on rotometer, and no injector vacuum. What is the most likely cause of the problem? | air leak uptream of rotometer. | gas line plugged. | injector clogged. | pressure reducing valve diaphrm. | none of the above. | 3 |
| 22 | A chlorine demand test will show the | safe amount of chlorine that may be fed without killing fish. | number of lbs. of chlorine required to kill 100% of the coliforms. | amount of chlorine required to give a desired residual in a period of time. | amount of chlorine required to satisfy the BOD. | none of the above. | 3 |
| 23 | One-ton chlorine tanks | have fusible plugs located at the valves. | must be stored in an upright position. | remove liquid chlorine from the top valve. | use the bottom valve only with chlorine evaporators. | none of the above. | 4
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