Industrial Instruments N4 — Document

April 2018 — N4 — Industrial Instruments

N4 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 34 items found

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Q1— Section header —

1.1Calculate the height of the mercury displaced in the narrow leg of an unequal leg manom eter if the following are given: Differential pressure applied = 25 kPa eg

1.2Make a neat labelled sketc h of a set of bellows which can be used to determine differential pressure (Barton cell\ (4\

1.3A conductor has a specific resistance of 8 10 What will the conductor's resistance be if it has a length of 50 m and diameter of 1 mm? (4\

1.4State FOUR factors which would influence the movement at the free end of a ourdon tube. (4\

1.5Briefly explain the operation of a rare earth pressure transducer. (3\

1.6Explain the piezo electric effect. (2\

1.7A dead weight tester contains a piston with a cross sectional area of 0,001 m

Q2— Section header —

2.1alculate ith the aid of a mercury manometer , the height of water in an open tank if the following is given: The zero mark on

2.2Make a neat, labelled sketch of a sight glass which is used to measure the level of the liquid in a boiler. Sho the necessary taps (4\

2.3ow can the quantitative volume of a vessel be verified w ith a dipstick that measures the level

Q3— Section header —

3.1Name THREE types of orifice plates and make a sketch of each of them (6\

3.2The pressure difference across the narrowing in a pipe is 100 mm of water at a flow rate of 110 m /h. What will the flow rate be at 180 mm

3.3Explain the principle of displacement type flow meter (3\

3.4Make a sketch that shows the variation of the static pressure curve /profile across an orifice plate

3.5State THREE methods that can be us ed to compensate for the square root effect applicable to all Bernoulli

Q4— Section header —

4.1State Stefan Boltzmann's l aw (2\

4.2Draw a characteristic curve of a thermistor. (2\

4.3State TWO applications of thermistors. (2\

4.4What is the purpose of a pneumatic relay? (2

4.5Explain the Peltie effect (2\

4.6Make a neat fully labelled sketch of a magslip telemetering system. (4\

4.7Explain how a disappearing filament optical pyrometer functions (5\

4.8Make a simple sketch of a basic current telemetering system where a change (input\ pressure causes a current. (4\ [23 (8080194\

Q5— Section header —

5.1What is meant by proportional action (2\

5.2Make a neat sketch to show how proportional control i s achieved in a simple fla pper and nozzle system (4\

5.3Draw a simple block diagram of a closed loop control system. Clearly label all the elements

5.4Describe valve positioner (2\

5.5xplain what is meant by measured variable (2\

5.6Name the areas indicated on the sketch below Write only the answer next to the question number (1

Mark Allocation

Total100 marks

Sections25 + 10 + 20 = 55 marks

Paper information

TitleDocument

SubjectIndustrial Instruments

LevelN4

Document typeQuestion paper

Year2018

MonthApril

Pages6

Downloads2

Examination context

Decade2010s

Years ago8y

SeasonAutumn (SH)

Start daySunday

Exam periodApril 2018

Days since exam3,115

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

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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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Pages6

Archived on8 September 2026

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