Water Treatment Practice N3 — Document

August 2021 — N3 — Water Treatment Practice

N3 2021 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 4 pages 📝 33 items found

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Q1— Section header —

1.1Give the chemical name for each of the following chemical formulae:

1.1.1CaCO

1.1.2SO

1.1.3Mg(HCO

1.1.4Ca(OH\

1.1.5

1.2Calculate the molecular mass of the following compounds:

1.2.1Sodium Hydroxide (3\

1.2.2Ferric Oxide (Rust\ (4\

1.2.3Soda ash (3\ [15]15

Q2— Section header —

2.1Suspended matter is one of the general impurities found in water. Name FOUR such type and state their effects on water. (8\

2.2Name THREE sources com ing from surface run off. (3\

2.3Briefly explain the impact of the following dissolved salts found in water.

2.3.1Calcium and Magnesium (5\

2.3.2Iron and Manganese (5\ [21]21

Q3— Section header —

3.1Name FOUR types of water related diseases caused by pathogens in water. (4\ 8120033 Copyright reserved

3.2Water quality needs to be assessed and monitored to ensure water quality and check risk indicators. COPY and COMPLETE the following table to minimum monitoring frequency. DETERMINANT RAW WATER

3.3Water safety is indicated by using different colours to explain when water is safe or ready for use according to the colour classification system

3.4Briefly describe the stability index test (Ryznar\. (5\ [19]19

Q4— Section header —

4.1Use a simple sketch to illustrate the flow diagram of water treatment purification plant. (10\

4.2List FIVE components of pressure relief valve in the open position. (5\

4.3What is the purpose of sedimentation in water plant? (3\

4.4Briefly explain floc formation in water. (5\

4.5Give the theoretical formula to calculate retention time. (2\ [25]25

Q5— Section header —

5.1Explain the different methods of pre chlorination and post chlorination (6\

5.2Use the chemical reaction to explain the breakpoint chlorination when chlorine is added to water containing ammonia. (4\

5.3List SIX chemicals used to destruct harmful bacteria in water treatment. (6\

5.4Name FOUR different colours use for safety identification in industries. (4\ [20] TOTAL: 100 8120033 Copyright reserved20

Mark Allocation

Total100 marks

Sections15 + 21 + 19 + 25 + 20 = 100 marks

Paper information

TitleDocument

SubjectWater Treatment Practice

LevelN3

Document typeQuestion paper

Year2021

MonthAugust

Pages5

Downloads4

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,898

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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