WASTEWATER COLLECTIONS (Class II) Questions with 100% Correct Answers

The amount of oxygen that nay become dissolved in a given amount of water is MOST related to... Correct Answer Tempertaure The gas most commonly associated with septic wastewater is... Correct Answer Hydrogen sulfide What determines the amount of hydrogen sulfide produced in a sewer? Correct Answer pH Four conditions are necessary to create an explosion. Three of these conditions are: combustible gas, adequate oxygen, and sufficient heat. What is the fourth condition? Correct Answer Proper mixing of gas and oxygen One kilowatt is the equivalent of _____________ horsepower. Correct Answer 1.34 The lack of an unpleasant odor in a manhole, lift station, or other structures does NOT always mean that no dangerous gases are present because... Correct Answer -Most dangerous gases have no odor -Oxygen may still be lacking -Some gases deaden the sense of smell As the impeller wears on a pump, the pump efficiency will... Correct Answer Decrease How closely an instrument measures the actual value of the process variable being measured is called its... Correct Answer Accuracy Vibrations in pumps may be caused by improper motor-pump... Correct Answer Alignment Advantages of a video tape recording system include... Correct Answer Length and severity of defective areas can be recorded The MOST widely used type of prime mover in a pumping plant is... Correct Answer Electric motor "Schedule 40" refers to... Correct Answer Wall thickness Hazards that may damage a TV camera going through a sewer include... Correct Answer - Deep water that submerges the camera - Fogging of optical lens