CLASS D BASIC WATER PRACTICE
TEST QUESTIONS AND CORRECT
ANSWERS
A trench 24in wide 800ft long and 4ft deep is to be excavated. The amount of soil exca
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vated is? - ans-6400ft ws ws wsws
An elevated storage tank had pipe 150 feet above ground when full water pressure at t
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he bottom psi should be? - ans-65
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Chlorine dosage for water is 2.7mg/l if chlorine residual after 30 minutes is 0.8mg/
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l. What is demand expressed in mg/l? - ans-1.9
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Water is pumped 250 gallons a min. How long to fill 100,000 gallon tank? - ans-6.6
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A free chlorine residual of 0.6mg/
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l is desired how many mg/
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l of chlorine will be needed when chlorine demand of water is 2.2mn/l? - ans-1.6
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A chlorine dosage of 2mg/
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l is to be added to 600,000 gallons of water how many pounds of chlorine 100% are ne
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eded to obtain this concentration? - ans-10
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The hydrologic cycle is? - ans-Recycling of water between the earth & atmosphere
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Basic water PH reading is? - ans-8.5
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A chemical of water impacting scaling is? - ans-Calcium
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What is Raw water? - ans-Untreated water
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Regulated chemical compound formed when disinfectants react with naturally occurring
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organic matter? - ans-By products THM/HAA
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Diseases by contaminated water also known as waterborn disease are? - ans-
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Dysentery, Hyphoid, Giardiasis, Hepatitis ws ws ws
A fire and explosion exsist if granulated disinfectant, calcium hydrochlorite come in cont
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act with? - ans-Oil petro products
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TEST QUESTIONS AND CORRECT
ANSWERS
A trench 24in wide 800ft long and 4ft deep is to be excavated. The amount of soil exca
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vated is? - ans-6400ft ws ws wsws
An elevated storage tank had pipe 150 feet above ground when full water pressure at t
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he bottom psi should be? - ans-65
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Chlorine dosage for water is 2.7mg/l if chlorine residual after 30 minutes is 0.8mg/
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l. What is demand expressed in mg/l? - ans-1.9
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Water is pumped 250 gallons a min. How long to fill 100,000 gallon tank? - ans-6.6
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A free chlorine residual of 0.6mg/
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l is desired how many mg/
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l of chlorine will be needed when chlorine demand of water is 2.2mn/l? - ans-1.6
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A chlorine dosage of 2mg/
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l is to be added to 600,000 gallons of water how many pounds of chlorine 100% are ne
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eded to obtain this concentration? - ans-10
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The hydrologic cycle is? - ans-Recycling of water between the earth & atmosphere
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Basic water PH reading is? - ans-8.5
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A chemical of water impacting scaling is? - ans-Calcium
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What is Raw water? - ans-Untreated water
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Regulated chemical compound formed when disinfectants react with naturally occurring
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organic matter? - ans-By products THM/HAA
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Diseases by contaminated water also known as waterborn disease are? - ans-
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Dysentery, Hyphoid, Giardiasis, Hepatitis ws ws ws
A fire and explosion exsist if granulated disinfectant, calcium hydrochlorite come in cont
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act with? - ans-Oil petro products
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