Radio Theory N2 — Document

November 2023 — N2 — Radio Theory

N2 2023 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 43 items found 📚 1 topics

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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 —

1.10\n the ANSWER BOOK.

1.1In an egative/ ositive\

1.2When measuring resistance under test. ( eries/ arallel\

1.3bottom interference. ( dd/ emove\

1.4The loudspeaker is a device that raphic/ ound\

1.5A microphone can change pressure on the surface and convert it into waves. (electrical/sound\

1.6o bias/ everse orward\

1.7When an alternating potential is applied to a capacitor, it appears to pass a esistance/ urrent\

1.8half ull wave/ irect\

1.9everse/ orward\

1.10varies in accordance with the amplitude of modulating signal requency/

Q2— Section header —

2.1The equation e = 150 sin 314, 159 t voltage represents a certain alternating current. Calculate the following for the given voltage expression

2.1.1The peak to peak value of the wave (2\

2.1.2The frequency of the wave (2\

2.1.3The angle in degrees, after 0,015 seconds (2\ 11040862

2.1.4(2\

2.1.5The instantaneous voltage value after 16 5 milliseconds (4\

2.2Certain ci rcuit conditions exist when a R circuit resonate List any FOUR conditions

Q3— Section header —

3.1Name any FIVE factors that limit the accuracy of an analogue meter in the repair of a radio receiver. (5\

3.2When repairing a radio you will need instruments and equipment . Name any THREE instruments you will need to do the work.

3.3The oscilloscope can be used to show a graphic representation of a sine wave. Give any FIVE applications of the oscilloscope [13]13

Q4— Section header —

4.1Draw the following circuit symbols you find in a radio amplifier

4.1.1PNP Transistor

4.1.2NPN Transistor

4.1.3MOSFET P Channel Transistor

4.1.4

4.2Draw a neat labelled circuit diagram of a common collector amplifier. (8\ [16]16

Q5— Section header —

5.1The limiter stage is only used in FM superheterodyne radio receivers rovide the function of the limiter. (2\

5.2The superheterodyne receiver is the most popular receiver used in radios. Draw a neat labelled block diagram of an AM superheterodyne receiver and show all interconnections between stages. (10\ 11040862

5.3Complete the following sentences by filling in the missing word or words. Write only the word or word next to the question number (5.3\in the ANSWER BOOK.

Q6— Section header —

Q7— Section header —

7.1Sound in a cell phone is heard through the speakers. Draw a neat labelled sketch of a moving coil loudspeaker. (8\

7.2Give the threshold voltage needed to overcome the barrier potential for germanium and a silicon diode respectively. (2\ [10]10

Q8— Section header —

8.1The selection of the bias point on a transistor determine the classes of amplification . N ame FOUR classes of amplification. (4\

8.2Explain what the fault is when the audio stage amp in a superheterodyne receiver is faulty. (3\

8.3Name any THREE transformers found in a radio receiver. (3\ [10] TOTAL: 100 1104086210

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections10 + 16 + 13 + 16 + 14 + 11 + 10 + 10 = 100 marks

Paper information

TitleDocument

SubjectRadio Theory

LevelN2

Document typeQuestion paper

Year2023

MonthNovember

Pages7

Downloads3

Examination context

Decade2020s

Years ago3y

SeasonSpring (SH)

Start dayWednesday

Exam periodNovember 2023

Days since exam1,076

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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