Radio Theory N3 — Document

November 2022 — N3 — Radio Theory

N3 2022 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 31 items found 📚 1 topics

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Questions — A Preview of What to Expect in the Document

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Q1— Section header —

1.1Why is the loss or gain in communication systems usually expressed as a power ratio? (2\

1.2A certain amplifier with an input to output power ratio of 4 40 has an input impedance of 1 input of another amplifier. This amplifier produces a gain of 10 dB. Determine:

1.2.1The total gain of the system (2\

1.2.2The output of the second amplifier when a sine wave with a maximum voltage of 1,414 V is applied to the input of the first (8\ [12]12

Q2— Section header —

Q3— Section header —

Q4— Section header —

4.1Draw a neat, labelled block diagram of a ingle ideband (SSB\nsmitter. (11\

4.2The following information concerns an SSB transmitter: Audio spectrum 300 Hz to 3 kHz IF carrier oscillator 4 MHz Local oscillator frequency

4.3State the THREE properties that make a balanced modulator suitable for use in a SSB transmitter. (3\

Q5— Section header —

5.1Draw the response curve of an FM discriminator with a centre frequency of 10 7 MHz and a bandwidth of 200 kHz. Clearly show all points of importance i.e. centre, lower and upper cut off frequency, linear response and bandwidth

5.2Briefly explain the use of automatic gain control (AGC\ in a radio receiver. (2\

5.3Give THREE advantages of AGC as used in radio receivers. (3\

5.4Why must AGC be taken off the detector stage before the filtering of the detector waveform? (2\

5.5Briefly explain the difference between simple AGC and delayed AGC (3\ [20]20

Q6— Section header —

6.1At wh ich frequencies are parabolic reflectors used? (1\

6.2How is the radiation from the feed which is not reflected by the paraboloid, prevented? (2\

6.3Make a neat, fully labelled sketch of a centre fed parabolic reflector with spherical shell. (5\ [8]8

Q7— Section header —

7.5\n the ANSWER BOOK.

7.1Ground waves travel further over land than water.

7.2Space waves give a range of approximate line of sight.

7.3Very low frequency (VLF\ has a frequency range of 30 kHz to 300 kHz.

7.4he lower the critical angle, the further the skip distance extends.

7.510

Q8— Section header —

8.1Name THREE types of multiplexing used in transmission systems Do not use abbreviations. (3\

8.2Give TWO examples of time division multiplexing used for digital data communication. (2\ [5] TOTAL: 1005

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

Year2022

MonthNovember

Pages6

Downloads4

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,439

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.

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