Fault Finding And Protective Devices N4 — Memo

August 2018 — N4 — Fault Finding And Protective Devices

N4 2018 Nated Engineering

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Q1— Section header —

1.1The fuse is blown or one of the fuse is o pen circuit The circuit breaker is faulty One of both ends of the start button is burned

1.2.616

2.1When you press the start butto , coil A energises. Retaining contact A retains the circuit. Main contactor A closes and the motor starts to rotate. (8\

2.2

2.3To prevent the pointer from oscillating [12]12

Q3— Section header —

3.1The thin oil in the dashpot has a suction effect on the plunger and this restrains the movement of the iron core When current through the coi l rises the magnetic filed increase and become stronger

3.422

Q4— Section header —

4.1By lamination of the coil By varnishing the conductor coil

4.5LT = L1 + L2 + L3 12,3mH +3,67mH + 10,8 mH 26,78mH [18]18

Q5— Section header —

5.1.1Current or voltage

5.1.2Current

5.1.3

5.2When a diode is suddenly reversed biased in order terminate conduction and barrier voltage must increase The increase is achieved by a reverse recovery current owing into the cathode side of the device until the conductors sto

Q6— Section header —

6.1

6.2.1X + X = X

6.2.2X + 1 = 1

6.2.3X = X

6.2.4A + O = A

6.2.5

6.3[10] TOTAL:10

Mark Allocation

Sections16 + 12 + 22 + 18 + 10 = 78 marks

Paper information

TitleMemo

SubjectFault Finding And Protective Devices

LevelN4

Document typeNated Engineering

Year2018

MonthAugust

Pages5

Downloads4

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,994

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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