Radio Theory N2 — Document

August 2021 — N2 — Radio Theory

N2 2021 Nated Engineering

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

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Q1— Section header —

1.15\n the ANSWER BOOK

1.1The distance between the plates of a capacitor plays no part in the capacitance of a capacitor.

1.2In DC applications, capacitors readily allow current to flow.

1.3The supply frequency generated by the power station is 50 Hz, thus the time to complete one cycle is 20 m inutes

1.4The total impedance of a series RLC circuit is equal to the sum of the individual impedances.

1.5The vacuum diode has a heater.

1.6

1.7The output signal of the common collector amplifier is in phase with the input signal.

1.8In radio wave communication the information transmitted is in the form of an electrical wave.

1.9The local oscillator in a radio receiver generates a constant frequency signal at variable amplitude.

1.10The Colpitts oscillator uses tapped inductance for the f eedback circuit.

1.11o operate as a Class A amplifier the working point of the amplifier must be selected at the mid

1.12An internal bias oscillator feeds a low frequency signal to the erase head.

1.13The ceramic cartridge operates on the piezoelectric effect.

1.14Field effect transistors are current controlled devices.

1.15An ohmmeter must always be connected in parallel with the load. (15 1\ [15] 1104086215

Q2— Section header —

2.1otal current flowing (9\

2.2oltage drop across the capacitor, resistor and inductor respectively (6\ [15]15

Q3— Section header —

3.1Draw the characteristic curve of a varactor diode. (3\

3.2Make a neat labelled sketch of a half wave power supply. (4\

3.3Give the term(s\ used to indicate the electrons found in the outer orbit of an atom. (2\

3.4Give the typical barrier potential for ermanium diodes. (1\ [10]10

Q4— Section header —

Q5— Section header —

Q6— Section header —

6.1Draw a neat fully labelled block diagram of an AM super heterodyne radio receiver. The diagram must clearly show the position of the AGC and gang tune. (10\

6.2Explain selectivity and sensitivity with regard to radio receivers. (2 2\ (4\

Q7— Section header —

7.1Calculate the series multiplier resistor needed to enable a moving coil meter with a full scale deflection current of 120 mA and

7.2Give a brief description of the function of the following controls as found in an oscilloscope

7.2.1Volts/division (2\

7.2.2Time/division (2\

7.2.3Brightness (1\

7.2.4shift (1\

7.2.5shift (1\ [10]10

Q8— Section header —

Q9— Section header —

9.1Name and explain the THREE main regions of a transistor. (6\

9.2Metal Oxide Semiconductor Field Effect Transistors are classified into two types ame the TWO different t ypes of MOSFETS

9.3Explain negative feedback as used in amplifiers. (2\ [10] TOTAL: 100 1104086210

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections15 + 15 + 10 + 10 + 10 + 14 + 10 + 6 + 10 = 100 marks

Paper information

TitleDocument

SubjectRadio Theory

LevelN2

Document typeQuestion paper

Year2021

MonthAugust

Pages6

Downloads4

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,897

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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File size228 KB

Pages6

Archived on8 September 2026

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