Communication Electronics N4 — Memo

April 2020 — N4 — Communication Electronics

N4 2020 Nated Engineering

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Q1— Section header —

1.1rue

1.2rue

1.3rue

1.4alse

1.5alse

1.6rue

1.7rue

1.8rue

1.9alse

1.1010

Q2— Section header —

2.1010

Q3— Section header —

3.1.2

3.2Remove the load between A and B and the short circuit battery AB 321 321

Q4— Section header —

4.1= 2 12

4.2Xc = 101010122 xxxxx Z = CL XXR 291,1326982,753500

4.4I = 959,759 = 0,026 A = 26 mA

4.5959,759 = 48,858

4.6VL = I = 0,026 753,982 = 19,604 V

4.7factor = R L/C\ = 500 -3 / 10 -9 = 1,508

4.8Q- factor = = 2 12

Q5— Section header —

5.1It is a resistive network designed to reduce voltage, current or power to controllable amounts and is independent of frequency. (2\

5.2ype ttenuator (1\

5.3Low pass filter (1\

5.4Ceramic filter (1\ [5] Input/ Inset Output/ Uitset5

Q6— Section header —

6.1A process whereby the position of the pulse carrier wave is made to vary in accordance with the instantaneous value of the modulating signal.

6.2A process whereby the width of the pulse carrier wave is made to vary in accordance with the instantaneous value of the modulating signal.

6.36

Q7— Section header —

7.1(3\

7.2During the positive half cycle of the modulated signal, capacitor C2 will charge to the peak value of the modulated signal through diode D. During the negative half cycle of the modulated signal, capacitor C2 will

Q8— Section header —

8.1iagram of AM superheterodyne r eceiver (6\

8.2Antenna: Electromagnetic waves are converted into electric current. RF mplifier: Amplifies the signal to which it is tuned Oscillator: Supplies RF signal (carrier\ of constant amplitude and frequency

Q9— Section header —

9.1\ \ \ \ 1060 103 = 5 m ength of the antenna is 5/2 = 2, (3\

9.2Electric field is vertical parallel to the antenna. (2\

9.3

9.4(2\

9.5It is the angle betwee n the norm and the radiated sky wave for a given M.U.F, where the wave is first refracted back without penetration. (2\

9.6.1Loop antenna

9.6.218

Mark Allocation

Sections10 + 10 + 10 + 16 + 5 + 6 + 10 + 15 + 18 = 100 marks

Paper information

TitleMemo

SubjectCommunication Electronics

LevelN4

Document typeNated Engineering

Year2020

MonthApril

Pages8

Downloads2

Examination context

Decade2020s

Years ago6y

SeasonAutumn (SH)

Start dayWednesday

Exam periodApril 2020

Days since exam2,385

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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File size275.3 KB

Pages8

Archived on8 September 2026

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