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COSC 325 EXAM 3 – Questions with 100% Scores
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COSC 325 EXAM 3 – Questions with 100% Scores
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COSC 325 EXAM 3 – Questionswith 100% Scores
What is the process used in sewage treatment for decomposing organic
matter in the presence of aerobic bacteria? - - Aeration
- An area where the effluent from a septic tank is distributed by horizontal
underground piping is called a/an: - - Drainfield
- What is hydrologic cycle? - - A continuous exchange of water among
atmosphere, the earth, and water bodies
- Rainwater is slightly acidic. - - True
- The bottom of a seepage pit should be placed at least ___ feet above the
water table. - - 2
- Which one of the following chemicals cause fine suspended particles in
water to coagulate? - - Hydrated aluminum sulfate
- What is meant by oxidation treatment of water? - - Breaking down of
organic or chemical pollutants in water in presence of oxygen
- What is the minimum size (diameter in inches) of a house sewer
connecting septic tank systems? - - 4
- Intervals for support of plastic pipes 1 1/2" and smaller in size should be: -
- 5'
- Water is defined as hot when it attains a temperature of: - - 110°F or
higher
- Separate maximum demand for either cold or hot water by a plumbing
fixture is ____% of the total SFU of that fixture. - - 75
- What is the recommended maximum water pressure on individual
plumbing fixtures? - - 50 psi
- Which one of the following valves is used to prevent back flow in a supply
system? - - Check
- What type of valve contains a rotating disk for controlling water flow? - -
Butterfly valve
, - Minimum number of plumbing fixtures required to be installed in a building
is based on: - - Use of the building and its population
- What is an air gap with reference to plumbing? - - Unobstructed vertical
separation between a water supply component and the relevant plumbing
fixture
- The weight of a cubic foot of water is ____ pounds. - - 62.4
- What is a waste stack? - - A vertical pipe that carries discharge free of any
fecal matter
- An accessible opening in a drainage system used for removal of
obstructions is called a_______. - - cleanout
- A floor drain is provided with: - - A strainer and a trap
- Which one of the following statements is not correct? - - A water closet
must have a vent pipe not smaller than 1 1/4"
- What are functions of a vent? - - (1) Provide free circulation of air in a
drainage system, (2) Equalize pressure in a drainage system, (3) Allow sewer
gases to escape to the atmosphere
- What is a stack vent? - - A soil or waste stack extended above the highest
horizontal drain
- What is TDS? - - Total dissolved solids
- What is a measure of pollution due to the presence of organic matter in
streams and wastewater? - - Biochemical oxygen demand
- Which one of the following is a correct statement? - - Water obtained from
a deep aquifer requires less elaborate treatment
- What is an aquifer? - - A geological formation saturated with water, below
the earth's surface
- pH value is measured on a scale of: - - 0-14
- Most building codes require that flush-tank operated water closets must be
installed in all public buildings. - - False
- What is the first step in selecting a water supply source? - - Deciding the
water demand
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