OIT Exam Questions & Answers 100%
Correct Latest Update.
What are colloids? - ✔-Very small particles suspended in water which are resistant to
settling.
What is turbidity measured in? - ✔-Nephelometric Turbidity Units (NTU)
What is the turbidity measurement that is visible to the naked eye? - ✔-5 NTU
What is an important indicator of treatment efficiency and particularly the efficiency of
filters and disinfection processes? - ✔-Turbidity
Why are particles that cause turbidity harmful? - ✔-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? - ✔-Grab samples and composite samples
What are grab samples and when is it used? - ✔-A single sample taken at one place and
time. Used when water quality and quantity are not variable
What is a composite sample and when is it used? - ✔-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? - ✔-Electrical potential or potential difference between two points.
Indicated the strength of the "push" on current
What is current and what are its units? - ✔-Flow off electric charge. Measured in
amperes
What is the typical rate of change (Hz) or alternating current? - ✔-60 cycles per second
What happens when wires or appliances carry more than their rated capacity of current?
- ✔-May overheat and cause fires. Circuit breakers stop this
What is the equation for voltage? - ✔-V=IR
What is Power (P), what is is measured in and what is the formula? - ✔-The rate at which
work is done or energy is produced.
Measured in Watts
P=VI
What is the symbol for flow and what is the formula for it? - ✔-Flow (Q)
Q= AV
What can flow provide info on? - ✔-Dentention time in tanks, flow between various
processes or sections, chemical feed rates, etc.
, What are the types of flow measurement determined by? - ✔-Whether water is flowing
in a closed pipe of an open channel
What is used to measure flow in an open channel? - ✔-Weirs or flumes. Flow is
determined by the height of water at a particular point
What is a flume? - ✔-A specially shaped constriction in the channel
What is a weir? - ✔-A dam or obstruction in the channel
What are venturi meters, ultrasonic meters, magnetic meters, doppler meters and orifice
meters used for? - ✔-Measuring flow in closed pipes.
What is static pressure? - ✔-The force exerted when water is at rest and not flowing
What is the pressure exerted by flowing water known as? - ✔-Dynamic pressure
What is the force exerted when water is at rest and not flowing? - ✔-Static pressure
What is the rise of water in a tube known as? - ✔-The head
What is the pressure loss due to friction as water flows through a pipe/filter etc? - ✔-
Headloss
What is headloss? - ✔-the pressure loss due to friction as water flows through a
pipe/filter etc
Correct Latest Update.
What are colloids? - ✔-Very small particles suspended in water which are resistant to
settling.
What is turbidity measured in? - ✔-Nephelometric Turbidity Units (NTU)
What is the turbidity measurement that is visible to the naked eye? - ✔-5 NTU
What is an important indicator of treatment efficiency and particularly the efficiency of
filters and disinfection processes? - ✔-Turbidity
Why are particles that cause turbidity harmful? - ✔-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? - ✔-Grab samples and composite samples
What are grab samples and when is it used? - ✔-A single sample taken at one place and
time. Used when water quality and quantity are not variable
What is a composite sample and when is it used? - ✔-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? - ✔-Electrical potential or potential difference between two points.
Indicated the strength of the "push" on current
What is current and what are its units? - ✔-Flow off electric charge. Measured in
amperes
What is the typical rate of change (Hz) or alternating current? - ✔-60 cycles per second
What happens when wires or appliances carry more than their rated capacity of current?
- ✔-May overheat and cause fires. Circuit breakers stop this
What is the equation for voltage? - ✔-V=IR
What is Power (P), what is is measured in and what is the formula? - ✔-The rate at which
work is done or energy is produced.
Measured in Watts
P=VI
What is the symbol for flow and what is the formula for it? - ✔-Flow (Q)
Q= AV
What can flow provide info on? - ✔-Dentention time in tanks, flow between various
processes or sections, chemical feed rates, etc.
, What are the types of flow measurement determined by? - ✔-Whether water is flowing
in a closed pipe of an open channel
What is used to measure flow in an open channel? - ✔-Weirs or flumes. Flow is
determined by the height of water at a particular point
What is a flume? - ✔-A specially shaped constriction in the channel
What is a weir? - ✔-A dam or obstruction in the channel
What are venturi meters, ultrasonic meters, magnetic meters, doppler meters and orifice
meters used for? - ✔-Measuring flow in closed pipes.
What is static pressure? - ✔-The force exerted when water is at rest and not flowing
What is the pressure exerted by flowing water known as? - ✔-Dynamic pressure
What is the force exerted when water is at rest and not flowing? - ✔-Static pressure
What is the rise of water in a tube known as? - ✔-The head
What is the pressure loss due to friction as water flows through a pipe/filter etc? - ✔-
Headloss
What is headloss? - ✔-the pressure loss due to friction as water flows through a
pipe/filter etc
