Electronic Control And Digital Electronics NCV Level 4 — Document

November 2023 — NCV Level 4 — Electronic Control And Digital Electronics

NCV Level 4 2023 NCV Engineering

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

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Q1— Section header —

1.1List FOUR applications for resonant circuits. (4\

1.2With the aid of circuit diagrams, distinguish between the low and high pass filter circuits in an RL series circuit. (3 + 3\ (6\

1.3A series circuit consists of a resistor of 40 ohm, capacitive reactance of 60 ohm and phase angle of 26,56 degrees (current leading\ . If the supply voltage is 220 V at a frequency of 50 H

1.3.1he inductive reactance. (3\

1.3.2he inductance in mH. (3\

1.3.3Draw the phasor diagram. (4\ [20]20

Q2— Section header —

2.1List FIVE factors that affect the oscillation frequency. (5\

2.2A 555 timer is an IC used in timers, pulse generation and oscillator applications. In astable mode it can be used for flashing lamps and LEDs. Draw fully labelled 555 timer in astable mode. (6\

2.3Describe the principle of operation of a switched mode power supply. (8\

2.4

2.5Name THREE advantages of a transformer coupling. (3\

2.6List TWO applications of UPSs. (2\ [30] (12041024\ Copyright reserved Please turn over30

Q3— Section header —

3.1If you cannot find the exact replacement for the transistor that you want to replace, you can always refer to one of the guidebooks for transistor substitutions. List and explain FOUR important parameters that you have to know so that you

3.2Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number .2.1 .2.5\in the ANSWER BOOK.

3.2.1stripboard is solderless board used when designing electronic circuits.

3.2.2An optocoupler is a device used to electrically isolate one section of a circuit from another section and used in cases where a high voltage power must be coupled to a high voltage device.

3.2.3A cold joint is a joint in which the solder does not make good contact with the component lead or PCB pad.

3.2.4When testing an inductor with a multimeter, if the coil is good, the ohmmeter will show the winding resistance which depends on the wire size an d the number of turns.

3.2.5

3.3Explain THREE problems that might occur when using a stripboard for the first time. (3\

3.4Name T WO types of measurements that you can take with a diode tester when testing a diode.

3.5What is fault finding [20]20

Q4— Section header —

4.1Define the following Boolean algebra laws:

4.1.1Commutative laws

4.1.2Associative laws

4.1.3

4.2Convert the following decimal numbers to 2421 BCD code:

4.2.110

4.2.2

4.3Explain the difference between encoders and decoders (4\

4.4Explain THREE guidelines that have to be followed to prevent software problems before installation. (3\ [15]15

Q5— Section header —

5.1Explain what you understand by the following terms and devices:

5.1.1PLC

5.1.2Latch

5.1.3Rung

5.1.4Relay

5.1.5

5.2The local can manufacturing company has requested you to write a program using ladder diagram logic that will do the following task: MOTOR A must start rotating immediately when you switch on the machine.

Topics Identified

Forms of Ownership

Mark Allocation

Total100 marks

Sections20 + 30 + 20 + 15 + 15 = 100 marks

Paper information

TitleDocument

SubjectElectronic Control And Digital Electronics

LevelNCV Level 4

Document typeQuestion paper

Year2023

MonthNovember

Pages6

Downloads3

Examination context

Decade2020s

Years ago3y

SeasonSpring (SH)

Start dayWednesday

Exam periodNovember 2023

Days since exam1,075

About Electronic Control And Digital Electronics 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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