Fault Finding And Protective Device N5 — Document

November 2023 — N5 — Fault Finding And Protective Device

N5 2023 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 6 pages 📝 46 items found

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Questions — A Preview of What to Expect in the Document

This section provides a quick preview of questions from the document. It may not display every question or the complete wording of each one. For the full content, including diagrams, tables and other information, view the original PDF above.

Q1— Section header —

Q2— Section header —

2.1Explain why one cannot start a large direct current motor without a starter. (5\

2.2he line voltage of a three phase alternator is measured . Between the first set of lines, it reads 380 . Between the other sets, it reads only 220

Q3— Section header —

3.1Explain how rushes are replaced on electrical machines (4\

3.2Name FOUR types of brushes. (4\

3.3State TWO reasons for lubricating the bearings in electrical machines. (2\ [10]10

Q4— Section header —

4.1Calculate the value of the dynamic breaking resistor needed to cause maximum breaking effort to a 30 kW, 220 V DC motor. (6\

4.2Explain the importance of using dynamic brak ing in DC machine (4\ [10]10

Q5— Section header —

5.1'Kick' neutral test

5.2Martindale test

5.3Polarity test

5.4Locked rotor test

5.510

Q6— Section header —

6.1Refer to FIGURE 1 on he DIAGRAM SHEET (attached\ and explain what happens in circuit when

6.2What is the function of the diode in the circuit? (2\

6.3What is the function of the R? (2\ [10]10

Q7— Section header —

7.1Draw a diagram of a positive series voltage regulator. (5\

7.2Draw a diagram of a negative series voltage regulator. (5\ [10]10

Q8— Section header —

8.1JK flip flop is a very useful flip flop. State ONE advantage of a JK flip flop.

8.2Draw the IEC symbol of the following:

8.2.1JK flip flop (3\

8.2.2type flip flop (3\

8.3Name any THREE types of shift registers. (3\ [10]10

Q9— Section header —

9.1Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A D\ next to the question number (9.1.1

9.1.6\n the ANSWER BOOK.

9.1.1OR gate NOT gate NOR gate NAND gate (8080115\

9.1.2necessary for a three input circuit input.

9.1.3all inputs are high. at least one input is high. all inputs are low. at least one input is low.

9.1.4is a basic logic gate with an output that complements the input. inverter gate NOR gate

9.1.5low inputs and a low output. low

9.1.6its inputs is high. NOT gate NOR gate OR gate AND gate

9.2Draw the logic circuit for an exclusive OR gate. (4\ [10] 808011510

Q10— Section header —

10.101001010,0110 (16\

10.2011,11 (8\

10.376,25 10 (2\

10.4111.01 (10\

10.510

Mark Allocation

Total100 marks

Sections10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 100 marks

Paper information

TitleDocument

SubjectFault Finding And Protective Device

LevelN5

Document typeQuestion paper

Year2023

MonthNovember

Pages7

Downloads4

Examination context

Decade2020s

Years ago3y

SeasonSpring (SH)

Start dayWednesday

Exam periodNovember 2023

Days since exam1,076

About Fault Finding And Protective Device 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

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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 size291.5 KB

Pages7

Archived on8 September 2026

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