Radio Theory N3 — Document

August 2021 — N3 — Radio Theory

N3 2021 Nated Engineering

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📋 Document Analysis

🎯 100 marks ⏱️ 3h 📄 4 pages 📝 27 items found 📚 1 topics

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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 —

1.1Prove that the loss or gain of a network is given that E and E are the output and input voltages respectively. R and R

1.2Calculate the radiated power of an antenna that has a gain of 8,5 dB. The cable connected to this antenna has a loss of 2,25 dB when fed by a 30 W transmitter. (6

Q2— Section header —

2.1Briefly explain common mode rejection ratio with regards to operational amplifiers (op

2.2Give the typical gain and frequency values of an op amp. (2\

2.3Give FIVE ideal characteristics of an op amp when operated in the open loop mode. (5\

2.4An op amp can perform a wide variety of operations. Do these include both analogue and digital operations? (1\ [10]10

Q3— Section header —

Q4— Section header —

4.1Draw a neat, labelled block diagram of a FM transmitter. (10\

4.2With respect to a transmitter, e xplain in detail why it is essential that the centre frequency around which the deviation occurs remains constant. (10\ [20]20

Q5— Section header —

5.1Draw a neat, fully labelled block diagram of a Single Sideband Receiver (SSB\. Clearly show all signal directions. (15\

5.2State THREE advantages and TWO disadvantages of SSB reception. (5\ [20] log 2020

Q6— Section header —

6.1What is the most important property of an antenna? (2\

6.2Make a neat sketch of a folded dipole and its radiation pattern.

6.3Give THREE improved characteristics of the folded dipole over a half wave dipole. (3\ [8]8

Q7— Section header —

7.5\n the ANSWER BOOK.

7.1The ground wave has a frequency of 300 kHz to 3 000 kHz.

7.2Space waves are used in satellite communications.

7.3The wavelength of any radiated wave can be determined by multiplying the velocity of the wave by the time taken for one full cycle of the wave.

7.4Skip distance does not depend on the critical angle at which the sky wave penetrates the ionosphere.

7.5The refractive index of air is an approximate unity. (5 2\ [10]10

Q8— Section header —

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections12 + 10 + 15 + 20 + 20 + 8 + 10 + 5 = 100 marks

Paper information

TitleDocument

SubjectRadio Theory

LevelN3

Document typeQuestion paper

Year2021

MonthAugust

Pages5

Downloads4

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,898

About Radio Theory 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.

File details

File size177 KB

Pages5

Archived on8 September 2026

File age47d

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