Ontario Pipeline - Winter 2015 - (Page 39)

DEPARTMENT | CERTIFICATION CORNER CERTifiCATiOn CORnER TesT yOuR knOWleDge. BY THE OWWA CERTifiCATiOn & EDUCATiOn COMMiTTEE Questions below resemble those appearing on certification exams. Your comments and suggestions are welcome. If you have specific topics you would like to have included, please send them to waterinfo@owwa.ca 1. The arrangement of pumps in series is primarily used to increase the: a) flow, usually by 70-80%. b) discharge head. c) flow, but keep discharge head the same. d) Pump efficiency. c) electrical phenomenon of colloidal particles predominate and control their behaviour. d) the surface area of colloidal particles is very small compared to their mass. 2. Which test would be used to determine total alkalinity? a) Marble test. b) Phenolphthalein test. c) Methyl orange test. d) Violet-green test. 7. The correct protective methods for backflow-prevention devices in order of decreasing effectiveness are: a) air gap, VB, rPz and DCVa. b) air gap, VB, DCVa and rPz. c) air gap, rPz, VB and DCVa. d) air gap, rPz, DCVa and VB. 3. Microorganisms from smallest to largest are as follows: a) viruses, protozoans and bacteria. b) bacteria, viruses and protozoans. c) viruses, bacteria and protozoans. d) protozoans, bacteria and viruses. 8. friction head losses can be calculated using tables based on: a) Charles' equation. b) Graham's formula. c) the Hazen-Williams formula. d) russell's calculations. 4. The movement of water from leaves, grasses and other plants to the atmosphere is called: a) organic evaporation. b) condensation. c) transpiration. d) capillary action. 9. Samples to be tested for coliforms are collected in plastic bottles that must contain a) sodium thiocarbonate. b) sodium thiooxalate. c) sodium thoisulphate. d) sodium thiocyanate. 5. Which type of valve will prevent the collapse of a pipe? a) Pressure-relief valve b) needle valve c) Pinch valve d) Vacuum relief valve 6. Which statement is true concerning colloidal particles? a) Colloidal particles are so small that gravity has little effect on them. b) the zeta potential between colloidal particles is balanced by covalent bonding. 10. it is standard practice to install fire hydrants on mains that are a minimum diameter of: a) 150 mm b) 200 mm c) 250 mm d) 300 mm 12. The pressure during fire flow conditions should not drop below: a) 100 kPa (15 psi). b) 140 kPa (20 psi). c) 170 kPa (25 psi). d) 210 kPa (30 psi). 13. Which is plotted on the horizontal scale (x-axis) of a pump curve? a) efficiency b) Capacity (flow rate) c) total head d) Power 14. A water tank with a capacity of 21,780 cubic meters is being filled at a rate of 133 l/sec. How many hours will it take to fill the tank? a) 31.6 hr b) 37.8 hr c) 42.9 hr d) 45.5 hr 15. Each year approximately which percentage of confined space deaths are would-be rescuers? a) 25% b) 50% c) 67% d) 75% See answers on page 46. 11. The first layer of backfill if compaction is required for a newly installed pipe should come up to a) the bottom of the pipe. b) one-third up the bottom of the pipe. c) the centre-line of the pipe. d) the top of the pipe. o n t a r i o p i p E l i n E | Winter 2015 | 39

Table of Contents for the Digital Edition of Ontario Pipeline - Winter 2015

From the Publications Chair
The OWWA Report
The OMWA Report
The OWWEA Report
From Our AWWA Director
Dual Water/Wastewater Plants: Challenges & Benefits
A Review of Urban Stormwater Runoff Impacts and Controls Regarding Drinking Water
Is Municipal Water Reuse in Ontario Feasible?
Managing Drinking Water Quality in Ontario: A Proactive and Preventative Approach
Staying Current on Water Issues
Book Review: Down the Drain: How We Are Failing to Protect Our Water Resources
Committee Reports
Certification Corner
Welcome New Members
Calendar of Events
OWWEA Member Listing
OWWEA Member News
Index to Advertisers

Ontario Pipeline - Winter 2015

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