Radio Theory N2 — Document

April 2019 — N2 — Radio Theory

N2 2019 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 33 items found 📚 1 topics

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Q1— Section header —

1.10\the ANSWER BOOK.

1.1Capacitors can be eith er (polarised magnetised

1.2The current is always shown with the letter (V/I\

1.3In a series resonant circuit the impedance is equal to (X /R\

1.4The current gain for a transistor connected in the common emitter mode is (high/unity\

1.5The local oscillator's frequency is always set to the (RF/IF\above the incoming frequency.

1.6The output of a microphone is (RF/AF\.

1.7To maintain a relatively constant sound under varying reception condition s, we use (AGC/AVC\ to alter the gain of the IF amplifiers.

1.8Semiconductor material that has been doped is referred to as (extrinsic/intrinsic material

1.9Crystal oscillators are popular because of their (high/low\sitivity.

1.10Class B amplifiers amplify only third/half\of the input signal. (10 1\ [10]10

Q2— Section header —

2.1The maximum value (1\

2.2The RMS value and aver age value (4\

2.3The time period (2\ [7] 110408627

Q3— Section header —

3.1Give SIX conditions that exist when a circuit with R, L and C in series resonates. (6\

3.2A coil with a resistance of 15 and an inductance of 128 mH is connected in series with a 58 F capacitor. The supply voltage to this circuit is 100 V. Determine the following

3.2.1The resonant frequency (4\

3.2.2The quality factor (Q\f the coil (3\ [13] QUESTIO N 413

4.1A transistor can be configured in three different ways to function as an amplifier, namely, common emitter, common base and common collector. Make neat sketches of each of the THREE configurations. Use NPN transistors.

4.2Tabulate the current gain , voltage gain and power gain of the

Q4— Section header —

Q5— Section header —

Q6— Section header —

Q7— Section header —

7.1Draw the symbol of a varactor diode.

7.2Draw the characteristic curve of a varactor diode (3\ 7. Name FIVE different instruments or equipment used in a radio repair shop. (5

Q8— Section header —

Q9— Section header —

9.1Name TWO basic types of cartridges found in record players. (2\

9.2Dr aw a fully labelled circuit diagram of an AM detector. Your diagram must include the input wave and the output wave. (7\ [9] TOTAL: 1009

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections10 + 7 + 13 + 20 + 10 + 9 = 69 marks

Paper information

TitleDocument

SubjectRadio Theory

LevelN2

Document typeQuestion paper

Year2019

MonthApril

Pages7

Downloads3

Examination context

Decade2010s

Years ago7y

SeasonAutumn (SH)

Start dayMonday

Exam periodApril 2019

Days since exam2,750

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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