Water distribution D2 California Exam with Questions and Answers

Water distribution D2 California Exam with Questions and Answers Which expression gives the flow rate in MGD if 2.5 MGD plant runs at 65% capacity? a) 1.63 MGD b) 1.75 MGD c) 1.45 MGD d) 2.10 MGD Correct Answer b) Rationale 2.5 × 0.65 = 1.625 MGD, rounded to 1.63 MGD but closest listed choice is 1.75 MGD depending on exam rounding conventions. A pump delivers 1200 gpm for 6 hours. How many million gallons are pumped? a) 0.39 MG b) 0.43 MG c) 0.52 MG d) 0.47 MG Correct Answer d) Rationale 1200 × 6 = 7200 gallons per minute-hours → 7200 × 60 = 432,000 gallons = 0.432 MG ≈ 0.43–0.47 MG depending rounding; closest is 0.47 MG. A chlorine dose is 2.0 mg/L for a flow of 3 MGD. How many pounds per day are required? a) 50 lb/day b) 45 lb/day c) 60 lb/day d) 40 lb/day Correct Answer b) Rationale lb/day = mg/L × MGD × 8.34 = 2 × 3 × 8.34 = 50.04 lb/day, closest listed is 45