Fault Finding And Protective Devices N4 — Memo

April 2018 — N4 — Fault Finding And Protective Devices

N4 2018 Nated Engineering

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Q1— Section header —

1.1When a fault is encountered but also the problem that caused the fault.

1.2.1The circumstance under which fault occurred should be investigated This include gathering and analysing the facts what they mean and what conclusion can be made.

1.2.2When a machine suddenly stops or does something it should not do not jump to conclusion as to what the cause is. It is better to ask what the symptoms of t he problem are.

1.2.3This could give an indication of which fault occurred previously the machine and in the productions process and how the fault deal with

1.2.4Different people interpret facts differently iews from different perspectives could contribute to better understanding of the problem.

1.2.5

Q2— Section header —

2.1If a point is selected between X and R with the same potential as Y exists between r and R2 No current flow through he two points with the same potential

2.2(10\ [18]18

Q3— Section header —

3.1s the unit of the resistance which produce oule energy when 1 ampere flows through it for 1 second (2\

3.2steel cor e consists of magnetic field he current in t he conductor changes or reverse s and the ma gnetic

3.3POLARISED CAPACITORS Electrolytic Tantalum (2 x 1\ (2\

3.3NON POLARISED CAPACITORS Silver mica Polystyrene Polycarbonate Ceramic Paper dielectric Polyester

3.4Distance between the plates and a normally closed contact

Q4— Section header —

4.1.1It gives deflected electron the shape of the waveforms

4.1.2emits electrons at high speed towa rds the screen of the CRT (2 x 2\

4.4(6\ [18] Input Input waveform Out put waveform18

Q5— Section header —

5.1.1Comparison

5.1.2Performed

5.1.3Lissajous f igur

5.1.4Equal

5.1.5

5.2It is to complete one cycle of changes in one second

5.3They occur when the high frequency signal is at its maximum resulting pattern forms an inverted parabola [14

Q6— Section header —

6.1Deflecting plates are provided inside the CRT whi ch creates an electrostatic fiel which deflect s electrode beam according to the input plates

6.2They short circuit any spikes or AC voltages that appear on the emitter to ground (2\

6.3Know exactly which one of the ohmmeter leads is the positive on e and which one is the

Topics Identified

Business Functions

Mark Allocation

Sections18 + 18 + 18 + 15 = 69 marks

Paper information

TitleMemo

SubjectFault Finding And Protective Devices

LevelN4

Document typeNated Engineering

Year2018

MonthApril

Pages5

Downloads4

Examination context

Decade2010s

Years ago8y

SeasonAutumn (SH)

Start daySunday

Exam periodApril 2018

Days since exam3,115

About Fault Finding And Protective Devices 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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