Communication Electronics N6 — Document

April 2018 — N6 — Communication Electronics

N6 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 34 items found 📚 1 topics

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Q1— Section header —

1.1Define an attenuato (2\

1.2Name FIVE types of unbalanced attenuators. (5\

1.3Determine ALL the component values for a type attenuator pad which will provide a 40 dB attenuation, to match two networks with impedances of 600 respectively. (10\

1.4Explain the TWO main disadvantages of a prototype filte r. (2\

1.5Name FOUR of the most common types of filters which are mostly used in communication circuits. (4\

1.6Determine ALL the component values for a multisection low pass filter consisting of terminating prototype half

Q2— Section header —

2.1Define a transmission line (2\

2.2State THREE elements th at determine the characteristic impedance of a transmission line. (3\

2.3A field quad cable has the following primary constants: Frequency = 78 ohms per km loop = 62 micromhos per km loop

2.3.1The characteristic impedance (3\

2.3.2The attenuation constant, in nepers and decibels per km (2\

2.3.3The phase constant, in radians and degrees per km (1\

2.3.4The w avelength in km (1\ ond radians sec 10000 8080246

2.3.5Velocity in km per second (1\

2.3.6Time in milliseconds, for a wave to travel 100 km along the line (2\ [15]15

Q3— Section header —

3.1Explain each of the following terms regarding an antenna

3.1.1Beam width

3.1.2Bandwidth

3.1.3Aperture (3 2\ (6\

3.2Explain each of the following terms with reference to an antenna:

3.2.1Polarisation

3.2.2Capture area

3.2.3Effective electrical length (3 3\ (9\

3.3

Q4— Section header —

4.1Explain why pulse duration modulation gives better signal to noise

4.2Determine the noise voltage at the in put of a television radio frequency amplifier with a bandwidth of 6 MHz at a temperature of 17 C, connected to a device that has

4.3impedance of wave generator with an internal Calculate:

4.3.1The n oise figure in dB (5\

4.3.2The e quivalent noise temperature at 25 (3\ [15 QUESTIO N 5:

5.5Explain why frequency modulation system is preferred rather than an amplitude

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections35 + 15 + 20 + 15 = 85 marks

Paper information

TitleDocument

SubjectCommunication Electronics

LevelN6

Document typeQuestion paper

Year2018

MonthApril

Pages11

Downloads4

Examination context

Decade2010s

Years ago8y

SeasonAutumn (SH)

Start daySunday

Exam periodApril 2018

Days since exam3,116

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

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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

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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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Pages11

Archived on8 September 2026

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