Communication Electronics N4 — Document

April 2019 — N4 — Communication Electronics

N4 2019 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 6 pages 📝 45 items found

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Q1— Section header —

1.10\in the ANSWER BOOK.

1.10An antenna in any receiver converts audio to sound. Ultraviolet radiation from the sun is t he primary cause of ionisation. A microphone converts audio signals into electromagnetic waves. he function of the catcher cavity

Q2— Section header —

2.1.2

2.1Define each of the following: 8080224

2.210

Q3— Section header —

3.1Calculate the:

3.1.1Total impedance

3.1.2Resonance frequency

3.1.3andwidth

3.1.4

Q3— Section header —

Q4— Section header —

4.1Make neat sketches of each of the following attenuators:

4.1.1type

4.1.2

4.2Draw a circuit diagram of a band pass filter. (3\

4.3Draw the basic attenuation versus fr equency graph for the filter in QUESTION

4.2(3\ [10]10

Q5— Section header —

5.1Travelling wave tube

5.210

Q6— Section header —

6.1Draw a fully labelled block diagram of an AM ransmitter. (5\

6.2Briefly explain the function of each stage of

Q6— Section header —

6.3Draw a circuit diagram of an AM full wave detector. 5\ [20]20

Q7— Section header —

7.1Draw a block diagram of an FM uperheterodyne receiver. (5\

7.2Make a neat la belled circuit diagram of an FM modulator. (5\

7.3Define frequency modulation (2\

7.4Define modulation index (2\

7.5What is

Q7— Section header —

Q8— Section header —

8.1Determine the length of a standard half wave dipol e antenna used to receive a 60 MHz radio signal. Assume that the velocity of the electromagnetic wave in the antenna is 3 10

8.2What is meant by vertical polarisation with regard to antennae? (1\

8.3Explain the term ionosphere as applicable to radio wave propagation. (2\

8.4Show by means of a sketch the possible ionosphere layers during the day as well as at night. (4\

8.5Define critical angle as applicable to radio wave propagation. (2\

8.6Make neat labelled sketches of each of the following antennae:

8.6.1Loop antenna

8.6.2Standard half wave dipole antenna (2 2\ (4\ [15] TOTAL:15

Mark Allocation

Total100 marks

Sections10 + 10 + 10 + 10 + 10 + 20 + 15 + 15 = 100 marks

Paper information

TitleDocument

SubjectCommunication Electronics

LevelN4

Document typeQuestion paper

Year2019

MonthApril

Pages7

Downloads4

Examination context

Decade2010s

Years ago7y

SeasonAutumn (SH)

Start dayMonday

Exam periodApril 2019

Days since exam2,748

About Communication Electronics 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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