Industrial Instruments N4 — Memo

April 2021 — N4 — Industrial Instruments

N4 2021 Nated Engineering

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Q1— Section header —

1.1.3Displacement easured variable Electrical signal (3\

1.2.3Inlet cone Velocity Pressure (3\

1.3.3Area Distance Dielectric (3\

1.4.4

1.5.2Gauge Less than (2\ [15]15

Q2— Section header —

2.1Telemetering

2.2Non bounded strain gauge

2.35

Q3— Section header —

3.1dLh1P2P1A2A ir fills the space above the sealing liquid in the dynamic area In w et calibration air is used as calibration medium

3.4

Q4— Section header —

4.1The Celsius scale has two fixed points namely the lower fixed point the upper fixed point (100 The Kelvin scale has the same unit

4.2(6\

4.3The method of measuring the temperature of an object by means of the quantity of energy which it radiates is called radiation pyrometry hese instruments measure the rate of energy given off per unit area of the

4.420

Q5— Section header —

5.1.1open or closed, high or low on or off for the valve be moved from the fully closed to the fully opened position (2\

5.1.3to move the actuator stem according the value of the input signal (2\

5.2.1Proportional electronic controller (1\

5.2.2Current signal ranging from 4 mA to 20 mA for control purpose Voltage signal of volts for feedback purpose (2\

5.2.3With no input signal, the feedback voltage is zero and the potential at point A relative to ground is zero A transducer or conversion element [20]20

Q6— Section header —

6.2

6.3Air supplyRegulating valvePressure-gaugeTubeTankBubbles of air escaping when pressure in tube exceeds pressure head of liquidZero lineLiquidHeight

6.420

Mark Allocation

Sections15 + 5 + 20 + 20 + 20 = 80 marks

Key Information

APS Score2 points

Paper information

TitleMemo

SubjectIndustrial Instruments

LevelN4

Document typeNated Engineering

Year2021

MonthApril

Pages7

Downloads2

Examination context

Decade2020s

Years ago5y

SeasonAutumn (SH)

Start dayThursday

Exam periodApril 2021

Days since exam2,019

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 size365.4 KB

Pages7

Archived on8 September 2026

File age47d

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