Practice Test Geeks(WTO) Water Treatment Operator Certification Practice Test
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Math Flashcards

7 cards from real WTO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Math flashcards as text

  1. A storage tank is 30 feet in diameter and 20 feet tall. What is its volume in gallons? (1 ft³ = 7.48 gal)

    Answer: 105,640 gal

    Volume = π × r² × h = 3.1416 × 15² × 20 = 14,137 ft³ × 7.48 = 105,745 gal ≈ 105,640 gal.

  2. A pump delivers 500 gpm. How many hours will it take to fill a 750,000-gallon reservoir?

    Answer: 25 hours

    Time = 750,000 ÷ 500 = 1,500 minutes ÷ 60 = 25 hours.

  3. A water main is 12 inches in diameter and 1,000 feet long. What volume of water does it hold in gallons?

    Answer: 5,875 gal

    Volume = π × (0.5 ft)² × 1,000 ft = 785.4 ft³ × 7.48 = 5,875 gal.

  4. A treatment plant adds 4.5 mg/L of chlorine to a flow of 2.8 MGD. How many pounds of chlorine are used per day?

    Answer: 105.3 lb/day

    lbs/day = 4.5 × 2.8 × 8.34 = 105.3 lb/day.

  5. Convert 2.5 cubic feet per second (cfs) to gallons per minute (gpm).

    Answer: 1,122 gpm

    2.5 cfs × 448.8 = 1,122 gpm.

  6. A backwash pump operates at 3,200 gpm for 8 minutes. How many gallons are used per backwash cycle?

    Answer: 25,600 gal

    Volume = 3,200 gpm × 8 min = 25,600 gallons.

  7. A chemical feeder applies 12 oz of chemical per day. How many pounds per week is this?

    Answer: 5.25 lb/week

    12 oz/day × 7 days = 84 oz ÷ 16 oz/lb = 5.25 lb/week.