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 1 / 4
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 2 / 4
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. 3 / 4
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)
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