Fault Finding And Protective Devices N6 — Memo

August 2019 — N6 — Fault Finding And Protective Devices

N6 2019 Nated Engineering

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Q1— Section header —

1.1means a battery is continually connected to a load and is designed to maintain a constant voltage throughout its load range. The voltage of the battery should supply sufficient current to the battery to overcome internal

1.2Acid will destroy an alkaline cell. Avoid spilling and keep installation dry. body is enclosed in steel, normally positive, insulate them from each other. heck attery lugs for dry or poor connections.

Q2— Section header —

2.1Ztot Fpo MVA Ztrans MVA transZ zZtotal Vine ZLZs

Q3— Section header —

3.1A positive charge cloud will induce a negative charge into both conductors and earth wire so that the potential gradient in the neighborhood of the line is reduced. The m agnitude of the line is thus less and the line is protected.

3.2

3.3Radial feeders: the main characteristic of the radial system is th power can flow in only one direction from generation to load feeders: in a loop system power can flow in both directions providing a more reliable supply.

Q4— Section header —

4.1.1Rate of gas evolu tion that will instantaneously cause the alarm to operate.

4.1.2volution rate that will cause displacement of oil t operate a relay which activates the alarm

4.1.3radual collection of gas requiri ng days or weeks to accumulate (3 (6\

4.2Acidity Density Flash point Pour point Oxidation Sludge Viscosity Corrosive sulphur Electric strength

Q5— Section header —

5.1(2\

5.2The radius of the conductor may be increased at the centre of the cross Special shaping of the outer conducto r to present a smoother surface nternal radius of lead sheath and thus thickness of the insulation may be

5.3It works on the principle of a pulse that is injected into the cable. The pulse shape and time interval can be observed on the oscilloscope. The time interval of the pulse that travels through the faulty core will be less than that of the health

5.4Doing pressure test oing vacuum test [15]15

Q6— Section header —

6.1Peak forwa rd and reverse blocking voltage Conducting angle Rate of rise DI/DT Rate of rise voltage dv/dt Turn on and turn off times Blocking voltages Leaking current

Mark Allocation

Sections18 + 13 + 19 + 18 + 15 + 17 = 100 marks

Paper information

TitleMemo

SubjectFault Finding And Protective Devices

LevelN6

Document typeNated Engineering

Year2019

MonthAugust

Pages6

Downloads8

Examination context

Decade2010s

Years ago7y

SeasonWinter (SH)

Start dayThursday

Exam periodAugust 2019

Days since exam2,629

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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