Radio Theory N2 — Document

April 2021 — N2 — Radio Theory

N2 2021 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 39 items found 📚 1 topics

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Q1— Section header —

1.1Explain time period with reference to alternating current waveforms. (2\

1.2

1.3Define inductive reactance (2\

1.4Calculate the maximum voltage value of a n alternating voltage with an average value of 191,1 V. (3\

1.5A series RLC circuit consists of a 220 F capacitor, a 20 mH inductor and a 10 resistor connected across a 12 V/50 Hz supply. Calculate each of the following:

1.5.1nductive reactance

1.5.2apacitive reactance

1.5.3mpedance of circuit

1.5.4urrent flow in circuit

1.5.520

Q2— Section header —

2.1Name SIX advantages of digital multimeter compared to an analogue multimeter. (6\

2.2A moving coil meter has a full scale deflection of 1 mA and an internal resistance of 200 Calculate the shunt resistor needed to convert the meter to an ammeter

2.3State the function of the intensity control on an oscilloscope (2\

2.4A signal occupies 5 horizontal divisions from the start of cycle to the end of the cycle on an osc illoscope screen. The time/div sweep switch is set to 3 s.

Q3— Section header —

3.1Draw a circuit diagram to show half wave rectification. The diagram must include a transformer,

3.2Explain the operation of a varactor diode. (3\ [10]10

Q4— Section header —

4.1Two or more amplifier stages are coupled to increase the overall gain. Draw a circuit diagram of a RC coupling amplifier. (6\

4.2Name THREE transistor amplifier configurations. (3\

4.3State TWO functions of a transistor. (2\

4.4Draw a fully labelled electronic symbol of a P channel depletion type MOSFET. (4\ [15]15

Q5— Section header —

5.1Show, by means of a fully labelled sketch, the construction of a moving coil speaker. (6\

5.2Name TWO advantages and TWO disadvantages of capacitor microphone. (4\ [10]10

Q6— Section header —

6.1Antenna

6.2Selectivity

6.3AM odulation

6.4Mixer

6.5Detector (5 2\ [10] (11040862\10

Q7— Section header —

7.1xplain how you would locate the faulty stage of an audio amplifier by using a signal generator and an oscilloscope. (4\

7.2Draw a fully labe led circuit diagram of a Hartley oscillator using a NPN transistor. (6\ [10]10

Q8— Section header —

8.10\n the ANSWER BOOK.

8.10The inductive reactance at r esonance in a series RLC circuit is equal to the capacitive reactance Current divides in a parallel circuit. The average value of a 10 peak

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections20 + 15 + 10 + 15 + 10 + 10 + 10 + 10 = 100 marks

Paper information

TitleDocument

SubjectRadio Theory

LevelN2

Document typeQuestion paper

Year2021

MonthApril

Pages6

Downloads3

Examination context

Decade2020s

Years ago5y

SeasonAutumn (SH)

Start dayThursday

Exam periodApril 2021

Days since exam2,020

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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Archived on8 September 2026

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