Instrument Trade Theory N3 — Memo

November 2022 — N3 — Instrument Trade Theory

N3 2022 Nated Engineering

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Q1— Section header —

1.1.5

1.2and oriented along its passive axis. The dummy gauge will therefore experience the same temperature effects as the measuring gauge and therefore the same change in resistance. The unwanted resistance change in the measuring gauge is cancelled by

1.33 marks for the sketches arks for correct strain gauges (5\

1.4

1.5Rare earth transducer Piezo electric transducer [25]25

Q2— Section header —

2.1.1Vm = V AD CA = 40 100 AD = 75

2.2potentiometer is a device for measuring an unknown potential difference then body A will give off energy to body B. Body A will keep on giving off energy until both body temperatures are the same.

2.3.2there is a transfer of heat energy from the hot body to the colder body, and the amount of radiated energy per time unit is roughly proportional to the fourth power of the absolute temperature difference between the two bodies.

2.4(6\ [25]25

Q3— Section header —

3.1and when these iron cores are in the middle of the two coils the bridge will be in balance. If a change takes place the iron core will be moved. This causes the circuit to be out of balance. The currents through the indicator

3.2(4\

3.32 marks for the drawing 3 marks for any three correct labels (5\

3.4.1

3.4.225

Q4— Section header —

4.1.1A change Pressure load Weight load Inertia load of a valve body assembly which provides a variable restriction to flow.

4.4.2A valve positioner is a device installed between the controller and the valve actuator in order to move the actuator stem in accordance with the value of the input signal [25] TOTAL:25

Topics Identified

Business Plan

Mark Allocation

Sections25 + 25 + 25 + 25 = 100 marks

Paper information

TitleMemo

SubjectInstrument Trade Theory

LevelN3

Document typeNated Engineering

Year2022

MonthNovember

Pages6

Downloads4

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,439

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.

File details

File size1.29 MB

Pages6

Archived on8 September 2026

File age45d

ContributorFreeMode

FingerprintEB2F20993AC0

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