Communication Electronics N6 — Document

August 2018 — N6 — Communication Electronics

N6 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 30 items found 📚 1 topics

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Q1— Section header —

1.1Determine ALL component values for an m derived low pass T type filter, given the following specifications:

1.2Determine the input impedance of an asymmetrical T type network with the aid of the information given below , if the power is attenuated by 5 dB

1.3Explain in detail the effect of an insertion loss on a network. (5\

1.4Determine ALL the component values for a T type filter network which will prevent all frequencies between the ranges of 3,5 kHz and

1.5Determine ALL the component values for an m derived high pass

Q2— Section header —

2.1Discuss the term standing wave ratio. (2\

2.2Consider the primary constants given below which were obtained during the 000 radians/second Primary constants: R = 22 ohms/km G = 18 x 10 C =

2.2.2The wavelength of the transmission The velocity of the transmission (8\ (2\ 8080246

2.3Determine the open circuit impedance of a transmission line given the following data: = 600 ohms s/c = 600 ohms

2.4The impedance of a transmission line is 400 j 200 ohms and is terminated by a load with an impedance of 300 45 ohms

Q3— Section header —

3.1Define the following terms with reference to antennas:

3.1.1Beam width (1\

3.1.2Bandwidth (1\

3.1.3Aperture (2\ 3. An antenna receives 12 10

3.3An earth station receives information from a satellite 180 km away from earth at a frequency of 90 MHz which supplies 30 watts from the antenna with a gain of 15. The receiver antenna has a gain of 12.

Q4— Section header —

4.1What causes the following noise

4.1.4Atmospheric Man made Thermal a gitation Cosmic (1\ (1\

4.2A receiver has an antenna with a resistance of 180 ohms and an equivalent noise resistance of 75 ohms. Determine:

4.2.1The noise figure in dB

4.2.2The ambient temperature for a 100 K and the equivalent temperature (2 4\ (8\

4.3Define the Shannon Hartley theorem. (2\

4.4Calculate the Baud rate of a telephone channel with a bandwidth of 15 kHz and signal to

4.5

Q5— Section header —

5.1Explain why single sideband transmission is commonly used for multi channel line telephony and point to

5.2Discuss why i ndependent single sideband transmission is preferred to other systems for communication. (2 5\ [10]10

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections25 + 20 + 20 + 25 + 10 = 100 marks

Paper information

TitleDocument

SubjectCommunication Electronics

LevelN6

Document typeQuestion paper

Year2018

MonthAugust

Pages10

Downloads3

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,992

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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