Instrument Trade Theory N3 — Document

November 2022 — N3 — Instrument Trade Theory

N3 2022 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 36 items found

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Q1— Section header —

1.1Choose a term from COLUMN B that matches description in COLUMN A. Write only the letter (A F\ next to the question number (1.1.1

1.1.5\in the ANSWER BOOK. COLUMN A COLUMN B

1.1.5Type of bonded strain gauge Type of non bonded strain gauge Used in record players and ceramic microphones Inductance and eluctance type

1.2strain gauge is used together with a Wheatstone bridge circuit to measure mass. Strain gauges are affected by ambient temperature changes. Explain how one can comp

1.3Make TWO neat labelled sketches that show how strain gauges are used to measure mass. Show the reaction of strain gauges when there is no load and when there is full load.

1.4Use the figure above to p rove that (6\

1.5ame FOUR pressure transducers that you know. (4\ [25]25

Q2— Section header —

2.1Study the figure below and answer the questions.

2.1.1Calculate the voltage out in the gauge. (9\

2.1.2State TWO main disa dvantages of the unbalanced two lead Wheatstone bridge. (2\

2.2What is a potentiometer (2\

2.3State the following law

2.3.1Provost' s theory of exchanging

2.3.2

2.4Make a neat labelled sketch of a photo electric optical pyrometer. (6\ [25]25

Q3— Section header —

3.1Make a neat, label ed sketch of a resonant impedance telemetering system and

3.2Draw neat, approximated labelled graph of the following control valve characteristics:

3.3Make a neat labelled sketch of a direct acting continuous bleed relay valve (5\ 11040463

3.4Answer the f ollowing questions on telemetry

3.4.1What is telemetry

3.4.225

Q4— Section header —

4.1Define the following terms

4.1.1A load change

4.1.2Control point

4.1.3Control point off set

4.1.4Deviation

4.1.5

4.2Make a neat, labelled sketch of a proportional, integral and derivative position balance controller. (6\

4.3Name FIVE forces acting on a pneumatic control valve. (5\

4.4What is the difference between the following:

4.4.1Valve plug

4.4.225

Mark Allocation

Total100 marks

Sections25 + 25 + 25 + 25 = 100 marks

Paper information

TitleDocument

SubjectInstrument Trade Theory

LevelN3

Document typeQuestion paper

Year2022

MonthNovember

Pages6

Downloads3

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,442

About Instrument Trade 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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