Water Treatment Practice N3 — Document

November 2023 — N3 — Water Treatment Practice

N3 2023 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 4 pages 📝 32 items found

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Q1— Section header —

1.5Flocculation Turbidity Protozoa Disinfection Sedimentation (5 2\ [10]10

Q2— Section header —

2.1Name three main properties of water with respect to hydraulics (3\

2.2Pumps are machine that allow transport and movement of fluid

2.2.1State FOUR ways in which pump cause the transport and movement of fluid. (4\

2.2.2Name SIX types of pump. (6\

2.3Draw a neat, labelled sketch to illustrate a pressure relief valve in the open position (5\

2.4Describe the purpose and functioning of a globe valve. (2\ [20]20

Q3— Section header —

3.1Complete and balance the following chemical reactions:

3.1Al (SO + Ca(HCO

3.1MgCO + Ca(OH\ (2\

3.1CaSO + Na CO (2\

3.1NH + HOCL (2\

3.1Ca(HCO boil (3\

3.2A reservoir has a diameter of 60 metres and a height of 14 metres. Determine the capacity of the reservoir in litre s. (4\ (8120033\

3.3A stone weighing 500 g is placed in a 1 000 ml measuring cylinder containing 320 ml of water. The water level now rises to 600 ml. Det ermine the

Q4— Section header —

4.1State THREE sources of surface runoff. (3\

4.2Name FOUR gases and state the reaction of each to the impurities found in water. (4 2\ (8\

4.3Name THREE layers formed in water during summer conditions. (3\

4.4Briefly describe the common sequence of the process followed when removing iron and manganese during the oxidation of potassium permanganate. (3\

4.5Name FOUR types of sedimentation tank (4\

4.6Name FOUR processes which occur within filter media during filtration (4\ [25]25

Q5— Section header —

5.1The re are various methods of corrosion control applied in water purification as part of the purification process. Name three methods to remove substances causing corrosion and briefly explain how each is applied in corrosion control.

5.2Draw a neat, labelled sketch to illustrate the break point chlorination curve. (10\

5.3Name TWO methods of applying cathodic protection to metal when it comes into contact with soil or water. (2\

5.4Write down the formula to calculate stability (Ryznar index (2\

5.5Name FOUR colour s found in colour coding for rapid identification of different machinery and machine parts (4\

5.6Name ONE type of protective clothing used by workers in workshop or plant. (1\ [25] TOTAL25

Mark Allocation

Total100 marks

Sections10 + 20 + 20 + 25 + 25 = 100 marks

Paper information

TitleDocument

SubjectWater Treatment Practice

LevelN3

Document typeQuestion paper

Year2023

MonthNovember

Pages5

Downloads3

Examination context

Decade2020s

Years ago3y

SeasonSpring (SH)

Start dayWednesday

Exam periodNovember 2023

Days since exam1,075

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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File size3.99 MB

Pages5

Archived on8 September 2026

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