Industrial Instruments N5 — Memo

December 2022 — N5 — Industrial Instruments

N5 2022 Nated Engineering

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Q1— Section header —

1.1.1It is the irregular movement of fluid made up of smaller currents, swirling and moving in all directions.

1.1.2Is the number of times the mass of any value of a substance is greater than the mass of the same value of water under the same temperature and pressure.

1.1.3

1.1.4When the number of hydrogen ions exceeds the number of hydroxyl ions.

1.1.5It is a balanced condition in a system without a controller. (5 (10\

1.2.1Turbulent flow

1.2.2Proportional control

1.2.3Hydrometer

1.2.4Viscosity

1.2.5Hygrometer (5 (10\

1.3.1True

1.3.2True

1.3.3True

1.3.4False

1.3.5True (5 (5\ [25] TOTAL SECTION A:25

Q2— Section header —

2.1notch weir Rectangular weir Trapezoidal/Cipoletti weir Parabolic weir Suppressed weir Hyperbolic weir (3\

2.2Potential energy: mgh Kinetic energy: 1/2 mv Pressure energy: PV (6\

2.3

2.4.2Advantages No pressure loss Can be used with liquids, gasses and solids directional Very accurate Pipe diameter has no effect (Any 2 Disadvantages Expensive

Q3— Section header —

3.1This vessel is weighed automatically b a scale, spring balance, or pneumatic force balance transmitter. Since the weight of a definite volume of the liquid is known, the instrument can be calibrated to read directly in specific gravity or density unit

3.2.1(7\

3.2.2Strong mineral acid and bases Abrasive slurries

3.3Detection HeadGamma RayDetectorFast NeutronSourceThermal NeutronDetectorMaterialCable to the measuringOr recording instrumentConveyor (Each labelling count a mark\ (7\ [22]22

Q4— Section header —

4.1.1Removable cover Cover clamp Glass electrode Reference electrode Removable bowl

4.1.2Flow type pH electrode assembly (2\

4.2pH = log[H log (4,6 -8 = 7.337 The solution is basic, because the pH value is greater than seven. [12]12

Q5— Section header —

5.1.1Proportional electronic controller (1\

5.1.2There will be an output signal of the halfway value between 4 mA and 20

5.1.4The capacitor C is charged and a potential appears at point A, forming an input signal to the amplifier. A feedback voltage is generated to C to counteract this and the potential at A returns to zero

5.3It is a combination of control unit in which the process variable is measured and compared with the desired value or set point. If the measured value differs from the desired value, a corrective signal

5.4Flow control valveSteam inLiquid inHeating coilHeat transfermeduimLiquid Thermometer. Process lag is the time taken for the water to reach the temperature of steam The time taken for a process to rectify the deviation

Mark Allocation

Sections25 + 21 + 22 + 12 + 20 = 100 marks

Paper information

TitleMemo

SubjectIndustrial Instruments

LevelN5

Document typeNated Engineering

Year2022

MonthDecember

Pages6

Downloads4

Examination context

Decade2020s

Years ago4y

SeasonSummer (SH)

Start dayThursday

Exam periodDecember 2022

Days since exam1,410

About Industrial Instruments 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 size286 KB

Pages6

Archived on8 September 2026

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