Water Treatment Practice N3 — Document

April 2018 — N3 — Water Treatment Practice

N3 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 4 pages 📝 36 items found

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Q1— Section header —

1.1Give ONE word/term for each of the following descriptions .Write ONLY the word/term next to the question number ( 1.1.1

1.1.1A simple apparatus by which a liquid may be moved from one container to another. (2\

1.1.2The process of bringing water and air into close contact to remove or modify constituents in the water (2\

1.1.3Water contains a large amount of dissolved salts which affect the taste of water. (2\

1.1.4Process that involves reducing the velocity of water in basins so the suspended material can settle out by gravity. (2\

1.1.5Separation of a substance from a solution or suspension, which is caused by chemical reaction. (2\ [10]10

Q2— Section header —

2.1Complete the following reactions :

2.1.1NH + HOCl (2\

2.1.2MgSO + Ca(OH\ (2\

2.1.3Ca(OH\ + Ca(HCO (3\

2.1.4CO + Ca(OH\ (2\

2.1.5Mg(OH\ + CO (2\

2.1.6CaSO + Na CO (2\

2.2What is the major purpose of filtration (2\

2.3Name THREE common characteristics of pumps (3\

2.4Why carbon dioxide is added to lime softened water? (2\ [20] 812003320

Q3— Section header —

3.1Briefly discuss the impact of low and high concentrations of fluoride on people, cattle and sheep. (6\

3.2Differentiate between apparent colour and actual colour in water (4\

3.3Briefly describe the purpose of iron and manganese in water. (6\

3.4Give FIVE golden rules for the effective disinfection of drinking water when using chlorine gas. (5\

3.5Explain the principle of floc formation (4\ [25]25

Q4— Section header —

4.1Name the FIVE stages of the water cycle. (5\

4.2List FOUR first aid benefits of the employees after all accidents in the workplace. (4\

4.3What is the practical significance of chlorine residual? (3

4.4How is scale formed in the water? (2\

4.4Explain the information needed to be supplied when samples are submitted for testing (10\ [24]24

Q5— Section header —

5.1What is the purpose of stabilisation in the water? (2

5.2Name and compare the TWO major types of corrosion. (4\

5.3Explain the procedure used when bringing a new sand filter into operation (5\

5.2Explain the procedure of starting up chlorinator. (6\

5.3Give FOUR tests that need to be don e in order to calculate stabilis ation indices like pH, Langelier and Ryznar. (4\ [21] TOTAL: 10021

Mark Allocation

Total100 marks

Sections10 + 20 + 25 + 24 + 21 = 100 marks

Paper information

TitleDocument

SubjectWater Treatment Practice

LevelN3

Document typeQuestion paper

Year2018

MonthApril

Pages4

Downloads3

Examination context

Decade2010s

Years ago8y

SeasonAutumn (SH)

Start daySunday

Exam periodApril 2018

Days since exam3,116

About Water Treatment Practice examination preparation

This TVET examination resource can be used as part of a structured revision programme. Past papers are most useful when learners attempt questions independently, work within a realistic time limit, and review their answers afterwards.

How to use this resource for revision

A TVET past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

understanding question requirements

applying subject knowledge

working under time constraints

checking answers

identifying revision priorities

A practical revision approach

Start by completing the resource without looking at the memorandum. Review incorrect and incomplete answers afterwards and make a short revision list based on the areas that caused difficulty.

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