{"id":3180,"date":"2019-08-06T00:01:12","date_gmt":"2019-08-06T07:01:12","guid":{"rendered":"https:\/\/www.waterandwastewatercourses.com\/?p=3180"},"modified":"2020-02-10T23:13:56","modified_gmt":"2020-02-11T07:13:56","slug":"water-distribution-study-guide","status":"publish","type":"post","link":"https:\/\/www.waterandwastewatercourses.com\/water-distribution-study-guide\/","title":{"rendered":"Water Distribution Study Guide"},"content":{"rendered":"

Here are 4 practice questions that will help you prepare for the exam. They were taken from a helpful Water Distribution Study Guide.\u00a0<\/span>\"\"<\/p>\n

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On the Water Distribution Operator Certification Exam, you’ll be tested on similar types of questions.\u00a0 Therefore, you should be prepared to answer the following types of questions on test-day.\u00a0\u00a0<\/span><\/p>\n

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Try to answer these questions by yourself.\u00a0 I placed the answers at the bottom of the page, with explanations.\u00a0 Good luck.<\/span><\/p>\n

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Water Distribution Study Guide<\/span><\/strong><\/h2>\n

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PRACTICE QUESTIONS:<\/span><\/strong><\/span><\/h2>\n

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  1. What chemicals are formed when chlorine is mixed with water?<\/span><\/li>\n<\/ol>\n

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    a.\u00a0 Hydrogen sulfide and ammonia<\/span><\/p>\n

    b.\u00a0 DPD and carbon dioxide<\/span><\/p>\n

    c.\u00a0 Sodium hypochlorite and calcium hypochlorite<\/span><\/p>\n

    d.\u00a0 Hypochlorous acid and hydrochloric acid<\/span><\/p>\n

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    2.\u00a0 Which pump component prevents leakage from the pump discharge to the suction?<\/span><\/p>\n

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    a.\u00a0 Lantern ring<\/span><\/p>\n

    b.\u00a0 Volute<\/span><\/p>\n

    c.\u00a0 Wear ring<\/span><\/p>\n

    d.\u00a0 Shaft sleeve<\/span><\/p>\n

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    3.Which meter relies on a bypass meter to measure the flow through the main line?<\/span><\/p>\n

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    a.\u00a0 Compound meter<\/span><\/p>\n

    b.\u00a0 Proportional meter<\/span><\/p>\n

    c.\u00a0 Orifice meter<\/span><\/p>\n

    d.\u00a0 Venturi meter<\/span><\/p>\n

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    4.Which of the following is a special type of check valve, used to prevent water from draining out of the suction side of the pump?<\/span><\/p>\n

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    a.\u00a0 Globe valve<\/span><\/p>\n

    b.\u00a0 Diaphragm valve<\/span><\/p>\n

    c.\u00a0 Air release valve<\/span><\/p>\n

    d.\u00a0 Foot valve<\/span><\/p>\n

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    5. What is a cone of depression?<\/span><\/p>\n

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    a.\u00a0 Depth of groundwater when the well-pump is not operating.<\/span><\/p>\n

    b.\u00a0 A seal located around a well, to prevent groundwater contamination.<\/span><\/p>\n

    c.\u00a0 A cone-shaped depression of the groundwater around the well, caused by pumping.<\/span><\/p>\n

    d.\u00a0 The vertical distance between the pumping water level and the ground surface.<\/span><\/p>\n

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    HELPFUL RESOURCES:<\/span><\/strong><\/h2>\n

    Water Distribution Operator Certification Classes<\/a><\/span><\/p>\n

    Practice Exams: Water Distribution<\/a><\/span><\/p>\n

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    ANSWERS:<\/span><\/strong><\/span><\/h2>\n

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    1. Answer: D,\u00a0Hypochlorous acid and hydrochloric acid<\/span><\/strong><\/h2>\n

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    When chlorine is mixed with water, two acids are formed:\u00a0 hypochlorous acid and hydrochloric acid.<\/span><\/p>\n

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    \"water<\/a><\/p>\n

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    Since acids are formed, the pH of water will decrease when chlorine is mixed with water.\u00a0 Remember – acids have low pH.<\/span><\/p>\n

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    \"water<\/a><\/p>\n

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    Among the two acids that are formed, hypochlorous acid is the chemical that provides disinfection power.\u00a0 Hypochlorous acid is a very effective disinfectant.<\/span><\/p>\n

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    \"water<\/a><\/p>\n

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    There’s a lot more information about disinfection that you’ll need to know for the exam.\u00a0 In fact, disinfection is the most commonly-tested topic on the operator exam.\u00a0 Therefore, make sure to study all aspects of disinfection before test-day.\u00a0\u00a0<\/span><\/p>\n

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    2. Answer:\u00a0 C, Wear ring<\/span><\/strong><\/h2>\n

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    A pump relies on a spinning impeller to move the water out of the pump.\u00a0 The spinning impeller is located in a casing, as shown below.<\/span><\/p>\n

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    \"water<\/a><\/p>\n

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    The blue arrow labeled “suction”, shows the water flowing into the pump.\u00a0 Meanwhile, the other blue arrow labeled “discharge”, shows the water flowing out of the pump.<\/span><\/p>\n

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    The wear ring is a metallic ring located between the impeller and casing.\u00a0 See below.<\/span><\/p>\n

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    \"water<\/a><\/p>\n

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    Its purpose is to prevent discharge water from leaking towards the suction, through the gap between the impeller and casing.\u00a0 It’s also designed to allow a small clearance between the impeller and casing, so that they do not rub against each other when the impeller is spinning.\u00a0\u00a0<\/span><\/p>\n

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    Wear rings are intended to be replaced occasionally.\u00a0 Over time, they will erode as a result of water leaking through the small clearance.\u00a0 It’s much cheaper to replace wear rings, instead of buying new impellers or casings.\u00a0 Therefore, wear rings are an important part of a pump.\u00a0 \u00a0<\/span><\/p>\n

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    \"water<\/a><\/p>\n

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    Additionally, for the operator exam, make sure to study all major parts of a centrifugal pump, as listed below:<\/span><\/p>\n