OIT Exam QUESTIONS AND ANSWERS
100% SOLVED (Newest 2025)
What are colloids? - Correct Answers ✅Very small particles
suspended in water which are resistant to settling.
What is turbidity measured in? - Correct Answers
✅Nephelometric Turbidity Units (NTU)
What is the turbidity measurement that is visible to the naked
eye? - Correct Answers ✅5 NTU
What is an important indicator of treatment efficiency and
particularly the efficiency of filters and disinfection
processes? - Correct Answers ✅Turbidity
Why are particles that cause turbidity harmful? - Correct
Answers ✅They can hide or entrap harmful organisms so
that the disinfectant is unable to reach them. It calls
increases CL demand which can be carcinogenic
What are the 2 types of sampling? - Correct Answers
✅Grab samples and composite samples
What are grab samples and when is it used? - Correct
Answers ✅A single sample taken at one place and time.
Used when water quality and quantity are not variable
,OIT Exam QUESTIONS AND ANSWERS
100% SOLVED (Newest 2025)
What is a composite sample and when is it used? - Correct
Answers ✅A series of samples taken over a period of time
which are combined to form a single sample. Necessary if
water quality changes greatly over time.
What is voltage? - Correct Answers ✅Electrical potential or
potential difference between two points. Indicated the
strength of the "push" on current
What is current and what are its units? - Correct Answers
✅Flow off electric charge. Measured in amperes
What is the typical rate of change (Hz) or alternating current?
- Correct Answers ✅60 cycles per second
What happens when wires or appliances carry more than
their rated capacity of current? - Correct Answers ✅May
overheat and cause fires. Circuit breakers stop this
What is the equation for voltage? - Correct Answers ✅V=IR
What is Power (P), what is is measured in and what is the
formula? - Correct Answers ✅The rate at which work is
done or energy is produced.
Measured in Watts
P=VI
,OIT Exam QUESTIONS AND ANSWERS
100% SOLVED (Newest 2025)
What is the symbol for flow and what is the formula for it? -
Correct Answers ✅Flow (Q)
Q= AV
What can flow provide info on? - Correct Answers
✅Dentention time in tanks, flow between various processes
or sections, chemical feed rates, etc.
What are the types of flow measurement determined by? -
Correct Answers ✅Whether water is flowing in a closed
pipe of an open channel
What is used to measure flow in an open channel? - Correct
Answers ✅Weirs or flumes. Flow is determined by the
height of water at a particular point
What is a flume? - Correct Answers ✅A specially shaped
constriction in the channel
What is a weir? - Correct Answers ✅A dam or obstruction
in the channel
What are venturi meters, ultrasonic meters, magnetic meters,
doppler meters and orifice meters used for? - Correct
Answers ✅Measuring flow in closed pipes.
, OIT Exam QUESTIONS AND ANSWERS
100% SOLVED (Newest 2025)
What is static pressure? - Correct Answers ✅The force
exerted when water is at rest and not flowing
What is the pressure exerted by flowing water known as? -
Correct Answers ✅Dynamic pressure
What is the force exerted when water is at rest and not
flowing? - Correct Answers ✅Static pressure
What is the rise of water in a tube known as? - Correct
Answers ✅The head
What is the pressure loss due to friction as water flows
through a pipe/filter etc? - Correct Answers ✅Headloss
What is headloss? - Correct Answers ✅the pressure loss
due to friction as water flows through a pipe/filter etc
What can decrease head loss? - Correct Answers ✅Larger
diameter and smoother interior surface
How can you make up for head loss? - Correct Answers
✅Energy inputs (pumping)
100% SOLVED (Newest 2025)
What are colloids? - Correct Answers ✅Very small particles
suspended in water which are resistant to settling.
What is turbidity measured in? - Correct Answers
✅Nephelometric Turbidity Units (NTU)
What is the turbidity measurement that is visible to the naked
eye? - Correct Answers ✅5 NTU
What is an important indicator of treatment efficiency and
particularly the efficiency of filters and disinfection
processes? - Correct Answers ✅Turbidity
Why are particles that cause turbidity harmful? - Correct
Answers ✅They can hide or entrap harmful organisms so
that the disinfectant is unable to reach them. It calls
increases CL demand which can be carcinogenic
What are the 2 types of sampling? - Correct Answers
✅Grab samples and composite samples
What are grab samples and when is it used? - Correct
Answers ✅A single sample taken at one place and time.
Used when water quality and quantity are not variable
,OIT Exam QUESTIONS AND ANSWERS
100% SOLVED (Newest 2025)
What is a composite sample and when is it used? - Correct
Answers ✅A series of samples taken over a period of time
which are combined to form a single sample. Necessary if
water quality changes greatly over time.
What is voltage? - Correct Answers ✅Electrical potential or
potential difference between two points. Indicated the
strength of the "push" on current
What is current and what are its units? - Correct Answers
✅Flow off electric charge. Measured in amperes
What is the typical rate of change (Hz) or alternating current?
- Correct Answers ✅60 cycles per second
What happens when wires or appliances carry more than
their rated capacity of current? - Correct Answers ✅May
overheat and cause fires. Circuit breakers stop this
What is the equation for voltage? - Correct Answers ✅V=IR
What is Power (P), what is is measured in and what is the
formula? - Correct Answers ✅The rate at which work is
done or energy is produced.
Measured in Watts
P=VI
,OIT Exam QUESTIONS AND ANSWERS
100% SOLVED (Newest 2025)
What is the symbol for flow and what is the formula for it? -
Correct Answers ✅Flow (Q)
Q= AV
What can flow provide info on? - Correct Answers
✅Dentention time in tanks, flow between various processes
or sections, chemical feed rates, etc.
What are the types of flow measurement determined by? -
Correct Answers ✅Whether water is flowing in a closed
pipe of an open channel
What is used to measure flow in an open channel? - Correct
Answers ✅Weirs or flumes. Flow is determined by the
height of water at a particular point
What is a flume? - Correct Answers ✅A specially shaped
constriction in the channel
What is a weir? - Correct Answers ✅A dam or obstruction
in the channel
What are venturi meters, ultrasonic meters, magnetic meters,
doppler meters and orifice meters used for? - Correct
Answers ✅Measuring flow in closed pipes.
, OIT Exam QUESTIONS AND ANSWERS
100% SOLVED (Newest 2025)
What is static pressure? - Correct Answers ✅The force
exerted when water is at rest and not flowing
What is the pressure exerted by flowing water known as? -
Correct Answers ✅Dynamic pressure
What is the force exerted when water is at rest and not
flowing? - Correct Answers ✅Static pressure
What is the rise of water in a tube known as? - Correct
Answers ✅The head
What is the pressure loss due to friction as water flows
through a pipe/filter etc? - Correct Answers ✅Headloss
What is headloss? - Correct Answers ✅the pressure loss
due to friction as water flows through a pipe/filter etc
What can decrease head loss? - Correct Answers ✅Larger
diameter and smoother interior surface
How can you make up for head loss? - Correct Answers
✅Energy inputs (pumping)
