Radio Theory N1 — Document

August 2019 — N1 — Radio Theory

N1 2019 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 7 pages 📝 50 items found 🔑 1 key info

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Q1— Section header —

1.10\ in the ANSWER BOOK

1.1A free electron has a neutral charge.

1.2An insulator is a material that easily conducts current.

1.3Transformers can step up or step down a voltage.

1.4Resistors limit current

1.5When capacitors are connected in parallel, the total capacitance increases.

1.6An inductor is basically a coil of wire.

1.7Speakers convert radio waves into sound waves.

1.8Ele ctrolytic capacitors are polaris

1.9Sound waves travel at the speed of light.

1.10Transverse waves make use of the ionosphere for communication. (10 [10]10

Q2— Section header —

2.1A round conductor is 1 m long and has a diameter of 0,2 mm. Its resistivity is 0,0017 Determine the resistance of the conductor in ohms. (5\

2.2What are free electrons (2\

2.3Explain Kirchoff s first law. (3\ [10] -14678998876420/.,+10

Q3— Section header —

3.1Study the circuit diagram below and answer the questions. Calculate the following:

3.1.1The total resistance (4\

3.1.2The total current flowing (2\

3.1.3The current flowing through the 3 [10]10

Q4— Section header —

4.1Name the FOUR factors that determine the strength of an electromagnet. (4\

4.2Make a neat labelled sketch of a bar magnet (3\

4.3State Faraday s law. (3\ [10]10

Q5— Section header —

5.1A moving coil meter has a coil resistance of 100 ohms. A current of 12 mA moving through the co il gives full scale deflection. Calculate the value of a shunt resistor required to enable the meter to have a

5.2Make a neat labelled sketch of a series type ohmmeter using a moving coil meter. (4\

5.3State THREE disadvantages of a moving coil meter. (3\ [10]10

Q6— Section header —

6.1Draw a neat labelled sine wave that represents a 720 spread. ndicate on the drawing the peak value, peak peak value and the time period. (4\

6.2Explain the differences between direct current and alternating current (4\

6.3Give a definition of frequency (2\ [10]10

Q7— Section header —

7.1Make a neat labelled sketch of a simple moving coil speaker. (6\

7.2Give the speed of light in m/s. (2\

7.3Define AM modulation. (2\ [10]10

Q8— Section header —

8.1Make a neat labelled sketch to show how a diode can be connected in the forward bias mode. Your sketch must include a diode, resistor and a battery. (3\

8.2Give the difference between intrinsic and extrinsic semiconductor material. (2\

8.3Make a neat labelled sketch of the characteristic curves of a silicon diode. (5\ [10]10

Q9— Section header —

9.1Draw the IEC symbols of the following components

9.1.1Inductor

9.1.2Variable capacitor

9.1.3Polaris ed capacitor (3 (3\

9.2The value of a resistor is 10 /5 /8888884//'!

9.3Stat e TWO different types of polaris ed capacitors. (2\

9.4What is the unit of capacitance (1\ [10]10

Q10— Section header —

Mark Allocation

Total100 marks

Sections10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 100 marks

Key Information

Contact Number0357888754

Paper information

TitleDocument

SubjectRadio Theory

LevelN1

Document typeQuestion paper

Year2019

MonthAugust

Pages7

Downloads4

Examination context

Decade2010s

Years ago7y

SeasonWinter (SH)

Start dayThursday

Exam periodAugust 2019

Days since exam2,627

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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