Industrial Electronics N4 — Document

August 2021 — N4 — Industrial Electronics

N4 2021 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 6 pages 📝 43 items found 📚 1 topics

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Q1— Section header —

1.1Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number (1.1.1

1.1.5\in the ANSWER BOOK.

1.1.1Voltage law states that the algebraic sum of all voltages around any closed loop in a circle is equal to zero

1.1.2Superposition theorem states that any network can be viewed as two terminal network and can be replaced by single source.

1.1.3The first step when calculating a circuit with two power source is to short one power source.

1.1.4If a circuit ha one power source on Thevenin's circuit , one should assume that the supply voltage equals Vth.

1.1.5

1.2Study the circuit diagram below and apply the uperposition heorem to calculate the current through the 9 (8\ [13] (808016413

Q2— Section header —

2.1Explain how the Q factor affects bandwidth with the aid of characteristic curve. (4\

2.2Study the circuit diagram below and calculate the current flowing across resistor using J notation. (12\ [16]16

Q3— Section header —

3.1

3.2PN junction diode has a room temperature of 29 C. Calculate the forward current of the diode.

3.3Calculate the current that must flow through ener diode of 20 and a connected to 28

3.4Draw a characteristic curve of varactor diode.

Q4— Section header —

4.1Explain the following terms:

4.1.1Rectification

4.1.2Peak reverse voltage

4.1.3

4.2A centre tap full wave rectifier has the following data: ac

4.2.1dc (2\

4.2.2The r ipple factor (4\

4.3A common base emitter circuit has the following data: CC 25 V RB

4.4An amplifier has the following data: nput power = 400 utput power = 200

Q5— Section header —

5.1Draw a two transistor model of a silicon controlled rectifier

5.2How do we switch on a light activated silicon controlled rectifier (2\

5.3Explain the basic construction of a quadrac (2\

5.4Explain the following components of a closed loop system:

5.4.1Controller

5.412

Q6— Section header —

6.1Name ONE transducer that converts rotating shaft position to electrical signals. (1\

6.2Explain the operational principle of a B ourdon tube. (5\

6.3What happens when incident light falls on light dependent resistor? (2\

6.4Explain the purpose of the base terminal in the three terminal device of a photo transistor. (2\ [10]10

Q7— Section header —

7.1Draw input and output waveforms of the following amplifiers using square and sine wave forms:

7.1.1Integrator

7.1.2

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections13 + 16 + 12 + 19 + 12 + 10 + 18 = 100 marks

Paper information

TitleDocument

SubjectIndustrial Electronics

LevelN4

Document typeQuestion paper

Year2021

MonthAugust

Pages8

Downloads3

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,896

About Industrial Electronics examination preparation

Industrial Electronics covers semiconductor devices, amplifiers, power supplies, and digital logic circuits. The examination tests both theoretical knowledge and practical circuit analysis.

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.

semiconductor theory

circuit analysis

component identification

digital logic principles

interpreting circuit diagrams

A practical revision approach

Practice circuit analysis with correct formulae and units. The memorandum rewards accurate calculations, correct component identification, and proper interpretation of circuit diagrams.

File details

File size272.3 KB

Pages8

Archived on8 September 2026

File age46d

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