Statistics for Texas Basic Waste Water Operations Ch#05 The Collection System

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This quiz has been taken 7 times
The average score is 31 of 38

Answer Stats

Question	Answer	% Correct
A ladder must be within ________ feet of anyone in the trench.	25	100%
Lift station designs include ________.	all of the above	100%
The ________ pump is most commonly used in a lift station	centrifugal	100%
The ________ valve, usually a swing type, prevents water on the discharge side of the pump from flowing backwards through the pump when it is off.	check	100%
The most important benefit of a collection system is comfort and convenience.	False	100%
If gasoline or solvent odors are detected in a manhole, the operator should hold their breath while opening.	False	100%
When wastewater cannot flow to treatment by ________, a lift station is used.	gravity	100%
Wastewater flowing into a collection system should come from ________.	homes, businesses, AND industry	100%
Motors used in wastewater are typically three-phase ________ motors.	induction	100%
Dry well stations have the ________ and pumps in a dry well separated from the adjacent wet well.	motors	100%
A ________ maintenance program keeps emergency repairs to a minimum.	preventive	100%
________ are important to lift station operation and maintenance.	Records	100%
When chemicals are used in the system, consider worker and public ________.	safety	100%
Hydrogen sulfide is very toxic and deadens the sense of ________.	smell	100%
Grade (or slope) and flow velocity are important to wastewater pipe installation.	True	100%
Safety rules for manholes include checking for gases and sufficient oxygen, wearing a lifeline, and having two workers assisting at the surface.	True	100%
The purpose of the collection system is to collect and transport waste to the point of treatment.	True	100%
To reduce gases, the TCEQ requires lift stations to have a ________ system.	ventilation	100%
If a ladder is used, it must be portable and extend ________ feet above the trench, in addition to being secured.	3	80%
OSHA sets standards for shoring, sloping, or trench boxes for trenches ________ feet or deeper.	5	80%
Maps should be as built, showing corrections made in the field during ________.	construction	80%
Pipe should be laid down so that the bell end is facing downstream or downhill.	False	80%
The primary cause of stoppages is roots or ________.	grease	80%
Foreign matter in the ________ can cause noisy operation and should be investigated.	impeller	80%
Parts of a collection system include wastewater lines, wastewater crossings, inverted siphons, cleanouts, manholes, and lift stations.	True	80%
Install wastewater lines no closer to a water line than ________ feet.	9	60%
Records include a ________ checklist.	daily	60%
Pipe materials used in collection system construction include polyvinyl chloride, clay, concrete, and bituminous fiberboard.	False	60%
Common methods to detect liquid depths and control pumps are ________, pneumatic bubblers, electric probes, and ultrasonic sensors.	floats	60%
The best design of isolation valve is the ________ valve because it leaves an unrestricted path when fully open.	gate	60%
The ________ valve is the most commonly used valve in the collection system.	gate	60%
Wastewater cleaning can increase pipe capacity, prevent septic conditions, maintain flow velocity, and ________.	reduce stoppages	60%
If a pump loses prime, it will heat up and damage the ________.	seal	60%
________ pumps in dry wells collect packing seal leakage as well as cleanup water.	Sump	60%
Hydraulic cleaners (jetting units) use ________ under pressure, which is forced through nozzles.	water	60%
Excavation spoil must be at least ________ feet from the edge of the trench.	2	40%
If the trench is ________ feet or deeper, a means of exit is required.	4	40%
For any gravity wastewater, the minimum velocity required to keep solids in suspension is 1ft/sec.	False	20%