Industrial Electronics N4 — Document

April 2020 — N4 — Industrial Electronics

N4 2020 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 7 pages 📝 55 items found

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Questions — A Preview of What to Expect in the Document

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Q1— Section header —

1.1Explain the following theorems:

1.1.1Superposition theorem

1.1.2

1.2FIGURE 1 (10\ [14]14

Q2— Section header —

2.1rallel LC circuit tuned to 320 k Hz with Z of 1 Calculate Q of this LC circuit. (2\

2.2Consider FIGURE 2 and use complex numbers to calculate the following: FIGURE 2

2.2.1

2.2.2The current flowing in the circuit (2\

2.2.3The voltage drop across the inductor (2\

2.2.4The voltage drop across the capacitor (2\ [10]10

Q3— Section header —

3.1Explain the following terms:

3.1.1Donor doping

3.1.2Acceptor atoms

3.1

3.2Draw a labelled characteristic curve of tunnel diode (6\ [12]12

Q4— Section header —

4.1Explain the following components of a DC power supply

4.1.1Turns ratio

4.1.2Rectification

4.1.3Peak reverse vo ltage

4.1.4

4.2A centre tap full wave rectifier circuit has V 240 V and R [12]12

Q5— Section header —

5.1Study the diagram of the input characteristic and explain the behaviour of V (4\

5.2The following data was given for an amplifier power = 15 W

5.2.1Calculate the voltage gain in dB (3\

5.2.2Calculate the current gain in dB (3\

5.3Explain negative feedback amplifiers (2\ [12]12

Q6— Section header —

6.1Cal culate the voltage output and gain of no inverting amplifiers if Vin = 5 V, = 25 k and (3\

6.2A summing amplifier has the following information = 10 k 12 k 17,5 k = 5,5 V, V 2,5 V, = 1 V. Calculate the output voltage V (4\

6.3Calculate th e input voltage (V \ if the integrating amplifier has rate of change of 0,9 V/sec, C and in

Q7— Section header —

7.1Explain the following terms of SCR

7.1.1Forward blocking

7.1.2

7.2Draw SCR characteristic curve (5\

7.3xplain the role of the comparator of a closed loop system (1\ [10]10

Q8— Section header —

8.1Study the circuit diagram and explain the operating principle (5\

8.2Explain the following conditions of the strain gauge used on a Wheat stone bridge

8.2.1Pressure is applied in the active gauge

8.2.2

8.3What makes a current to flow through light dependent resistor? (2\ [9]9

Q9— Section header —

9.1Name TWO types of CRT deflection systems (2\

9.2Explain the following components of oscilloscope block diagram

9.2.1Trigger circuit

9.2.2Delay line (2 (4\

9.3An oscilloscope displ ays amplifier gain with a setting V/div and the time base setting

9.3.1Peak peak voltage (2\

9.3.2The period and frequency (3\ [11] TOTAL:11

Mark Allocation

Total100 marks

Sections14 + 10 + 12 + 12 + 12 + 10 + 10 + 9 + 11 = 100 marks

Paper information

TitleDocument

SubjectIndustrial Electronics

LevelN4

Document typeQuestion paper

Year2020

MonthApril

Pages9

Downloads4

Examination context

Decade2020s

Years ago6y

SeasonAutumn (SH)

Start dayWednesday

Exam periodApril 2020

Days since exam2,383

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.

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Pages9

Archived on8 September 2026

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