Collection System Certification Quiz: 1. A pump is delivering less than the expected rate of discharge. What can cause this to happen? a. Discharge head too low b. Discharge head too high c. Check valve open d. Pump is primed 2. A map with a scale of 0.875 in.= 100 feet indicates that manhole A is 11.20 inches from manhole B. What is the actual distance between manholes? a. 980 ft. b. 781.3 ft. c. 1,280 ft. d. 2,343.8 ft. 3. If a repair job can be done by 7 people in 8.5 hours, how long will it take for 4 people to do a similar job? a. 4hours 30 min. b. 14hours 9 min. c. 4hours 51 min. d. 14hours 53 min. 4. In sewer maintenance, what is a pig? a. A bullet shaped object passed through a force main b. A power rod c. Any foul smelling equipment d. The hydraulic rodding truck 5. Mechanical ventilation of a lift station is required to a. Ensure safe working access b. Reducing chlorine demand c. Reduce corrosion d. Increase dissolved oxygen (DO) in raw wastewater Answers: 1. b 2. c scale distance x measurement / scale = actual distance 11.20 x 100 / 0.875 = 1280 ft 3. d if it takes 7 people 8.5 hours then you take 7people and divide it by 4 people and you get 1.75 now multiply that by the 8.5 hours and you get 14.875hours. To convert the 0.875 hours to minutes 0.875 hours x 60 min/hour = 52.5 round to 53minutes 4. a 5. a
Posted on: Mon, 27 Jan 2014 14:36:40 +0000
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