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Water Treatment OIT: test Questions with 100% Correct Answers | Latest Update | Verified
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What does the term 'contact time' mean? a) it is the amount of time a person is exposed to chlorine b) it is the amount of time allowed for chlorine to react in water to provide disinfection c) it is the amount of time a coagulant is exposed to water before flocculation occurs d) it is the amou...

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  • September 13, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • Water Treatment OIT
  • Water Treatment OIT

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Water Treatment OIT: test
What does the term 'contact time' mean?

a) it is the amount of time a person is exposed to chlorine
b) it is the amount of time allowed for chlorine to react in water to provide disinfection
c) it is the amount of time a coagulant is exposed to water before flocculation occurs
d) it is the amount of time it takes for chlorine to sterilize water - ✔️✔️b) it is the amount
of time allowed for chlorine to react in water to provide disinfection


What happens when a sewer is surcharged?

a) infiltration of ground water into sewers
b) flushing a sewer with clean water to clean debris away
c) hydraulically overloading a sewer
d) taxing a customer's water bill to pay for collection devices - ✔️✔️c) hydraulically
overloading a sewer


Trihalomethanes are produced when chlorine reacts with:

a) inorganic materials
b) chlorine dioxide
c) organic materials
d) ultra violet light - ✔️✔️c) organic materials


Which of the following is NOT an isolation valve?

a) ball
b) check
c) butterfly
d) globe - ✔️✔️b) check


What units are used to measure water pressure?

a) Kilowatts
b) Kilopascals
c) Horsepower
d) Head units - ✔️✔️b) Kilopascals

Which of the following is NOT an example of PPE (Personal Protective Equipment)?

, a) Exhaust fan
b) SCBA
c) Face shield
d) Traffic vest - ✔️✔️a) Exhaust fan

Which of the following are operators-in-training NOT allowed to do?

a) There are no restrictions on the duties of an operator-in-training
b) Any operational duties if not in the presence of another operator
c) Anything which could effect the quality of the water/wastewater
d) Be the operator with overall operational responsibility of the system - ✔️✔️d) Be the
operator with overall operational responsibility of the system

Define the term "head" as used in hydraulic systems.

a) The block of an internal combustions engine
b) The ability of a piston pump to overcome the force of gravity
c) The height or energy of water above a specified point
d) The distance between the liquid level and the cover of a well - ✔️✔️c) The height or
energy of water above a specified point

Which of the following statements accurately describes some of the properties of
chlorine?

a) I a colourless gas which is toxic to plants and animals; is flammable and explosive
b) Is a greenish/yellow gas with a penetrating odour; is heavier than air
c) Is a yellowish gas with an irritating odour; insoluble in water
d) Is lighter than air; soluble in water and forms a salt which is lethal to microorganisms
- ✔️✔️b) Is a greenish/yellow gas with a penetrating odour; is heavier than air

What happens when two or more different elements combine?

a) chemical compound is formed
b) atom is created
c) molecule is formed
d) concentration is created - ✔️✔️a) chemical compound is formed

What is the definition of a confined space?

a) Any space which is not actively ventilated by an electrical ventilation system
b) Any space from which exit by an injured worker is difficult
c) Any space where hazardous gas can accumulate or an oxygen deficient atmosphere
can occur
d) Any space where the distance from floor to ceiling is less than 3 metres - ✔️✔️a)
Any space which is not actively ventilated by an electrical ventilation system

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