Plant Operation Theory N3 — Document

August 2018 — N3 — Plant Operation Theory

N3 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 4 pages 📝 35 items found 🔑 1 key info

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Questions — A Preview of What to Expect in the Document

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Q1— Section header —

1.1Name THREE different ways whereby molecules of monomers enlarge with the addition of atoms to form polymers. (3\

1.2Explain gasification of coal (2\

1.3Write down the condensed structural formula of natural rubber. (4\

1.4Explain the properties of thermoplastic polymers like PVC. (4\

1.5Dis cuss the general mechanism by which a catalyst speeds up a chemical process. Use a neat, labelled graph to explain the similarities between a catalysed and uncatalysed chemical process (7\ [20]20

Q2— Section header —

2.1Name FOUR types of thermal insulation. (4\

2.2Name THREE reasons why thermal insulation is necessary in industry. (3\

2.3State the THREE main reasons for the failure of insulation materials. (3\

2.4Explain the term complete combusti on. (2\

2.5A fuel gas consists of 15% oxygen; 20% hydrogen; 35% carbon monoxide and 30% methane. Calculate the following:

2.5.1Theoretical quantity of oxygen required for the complete combustion of 70 m of this fuel (8\

2.5.2Quantity of air required if combustion takes place i n the presence of 3% excess air (2\ [22]22

Q3— Section header —

3.1Sketch a thermostatic steam trap and briefly discuss its operation. (8\

3.2Explain the purpose of each of the following:

3.2.1Economiser

3.2.2Vaporiser

3.2.3

3.3Name THREE general categories of steam traps. (3\ [17] 1104002317

Q4— Section header —

4.1Name SIX types of media that usually passes hrough the tube side. (6\

4.2Name THREE direct methods of heat exchange. (3\

4.3State the SIX reasons for poor work performance of heat exchangers. (6\

4.4Explain the purpose of each of the following:

4.4.1Cross flow baffles (3\

4.4.2Thermal resistance to heat transfer (2\ [20]20

Q5— Section header —

5.1Draw a labelled graph to illustrate Boyle's law. (5\

5.2Explain the term isothermal compression of a gas. (5\

5.3Explai each of the following terms:

5.3.1Absorption type refrigeration system (5\

5.3.2Volumetric efficiency of a compressor (3\

5.3.3Multi stage control (3\ [21] TOTAL: 100 1104002321

Mark Allocation

Total100 marks

Sections20 + 22 + 17 + 20 + 21 = 100 marks

Key Information

APS Score3 points

Paper information

TitleDocument

SubjectPlant Operation Theory

LevelN3

Document typeQuestion paper

Year2018

MonthAugust

Pages5

Downloads4

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,993

About Plant Operation Theory 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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Pages5

Archived on8 September 2026

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