AWWOA Level 1 Questions And Answers

AWWOA Level 1 Questions And Answers Bacteria that produces diseases are known as Ans- Pathogens Each 100 gallons of groundwater infiltration per dary system reduces the usable capacity of the system by... Ans- 1 person One waterborne disease believed to be caused by a virus is... Ans- Hepatits According to OSHA, what is the lowest safe concentration of oxygen for humans to breathe in order to avoid oxygen deficiency? Ans- 19.5% Oxygen What problems does hydrogen sulfide gas cause? Ans- Corrosion of sewers, structures, and equipment. At the same pressure, the dissolved oxygen in cold water tends to be higher or lower than in warm water Ans- higher Which of the following is an odourus gas produced by anaerobic decomposition? Ans- H2S The ammount of energy necessary to raise the temperature of one pound of water by one degree ferrenheight Ans- BTU One gallon of gasoline completely vapourized takes up how many cubic feet? Ans- 32 Sand silt and grit are mainly com[posed of Ans- inorganic matter Oxygen required to stabalize the decomposition of organic matter in a wastewater sample by bacterial action Ans- BOD Wastewater in which the solids have been decomposed to relatively inert solids is called Ans- Stable What is the function of the bubbler control on a pump wet well Ans- Senses liquid depth in the wet well and regulates pump operation A dead weight tester is used to... Ans- Calibrate pressure The effect of partially closing the discharge valve on a 3 phase induction motor driven centrifugal pump would be to Ans- cause the motor to draw less amperage A spacer ring in a pump packing gland to improve seal water distribution Ans- Lantern Ring Which type of pump works on the basis of inertia or mass moving in a circular motion Ans- Centrifugal Which type of pump works on the principle of a decrease in the overall specific weight of a confined column of a gas-water mixture Ans- air lift Double suction centrifugal pumps usually have the intake and discharge ports located on a horizontal plane above, below, or even with the pump centre line Ans- Below Leakage from a packing gland should be approximately Ans- one drop per second Centrifugal pumps are classified according to Ans- Direction of liquid flow through the impeller If a centrifugal pump has been running quietly and cavitation starts suddenly, this usually indicates Ansobstruction in the suction side An operator finds a centrifugal pump discharging at a reduced rate. They should check for.. Ans- Clogged or worn impeller A positive displacement sludge pump should never be placed into operation with... Ans- the discharge valve closed Pneumatic ejectors are not recommended when flow exceeds... Ans- 100 GPM On most gas engines, compression intake ceases when the piston is Ans- slightly past bottom dead centre Gas engine spark plugs should be removed, reset, and cleaned every.... Ans- 500 operating hours The ungrounded, or "Hot", conductor is normally Ans- Black The term "Drop Manhole" refers to Ans- a special manhole that provides for a sudden planned drop between the inlet sewer and outlet invert of the manhole In all but very unusual conditions, the minimum velocity at average flow in a sanitary sewer should be about Ans- 2 ft/s A long run of pressure sewer or force main must Ans- have air relief valves at high points Which of the following is not a sewer flow regulator Ans- water valve A bulkhead used in sewer maintenance is a Ans- temporary obstruction used to stop or divide the flow of wastewater Reporting requirements, sampling, and testing requirements are specified in a treatment plant's AnsOperating Approval In a worst case scenario, an operator's failure to comply with environmental protection legislation cold lead to Ans- Serious Illness or death Which legislation gives fundamental rights for workers and regulates safety requirements? Ans- OHSA Regulations applicab le to the water and wastewater industry including potable water regulation and wastewater and storm drainage are covered in the... Ans- Alberta Environmental protection and enhancement act and regulations Maximum acceptable concentrations for drinking water are set out in what document? Ans- The guidelines for canadian drinking water quality Which drinking water parameter is regulated at the water treatment plant as a maximum allowable concetration and in the distribution system as an aesthetic objective? Ans- Turbidity The responsibility for WHMIS is shared among: Ans- The supplier, employer, and worker. According to the alberta certification program, which of the following is not served by "public" facilities? Ans- Municipalities Water from which source is likely to need the most extensive treatment? Ans- Rivers What is the goal of the "multiple barrier" approach Ans- To minimize the chance of compromising water quality in the treatment process Where in the water treatment process is fluoride usually added? Ans- Post filter What is important when taking a biological sample? Ans- Always ensure your hands are clean Particles will setle fastest at what temperature? Ans- 6 de