Electronic Control And Digital Electronics NCV Level 2 — Document

November 2018 — NCV Level 2 — Electronic Control And Digital Electronics

NCV Level 2 2018 NCV Engineering

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Q1— Section header —

1.1Explain each of the following atomic concepts:

1.1.1Valence electrons

1.1.2

1.2Draw the structure of an atom (3\

1.3Explain the function of each of the following components:

1.3.1Capacitor

1.3.2

1.4Identify each of the following electronic components:

1.4.2

1.5Describe how N type material is formed (4\

1.6Explain the difference between electron flow and hole flow. (2\

1.7Give ONE application of each of the following diodes.

1.7.1LED

1.7.2

1.8A transistor has an emitter current of 1 mA and a collector current of 7,5 mA. Calculate the value of the base current (3\ [20]20

Q2— Section header —

2.1State THREE disadvantages of integrated circuits (3\

2.2State THREE basic applications of operational amplifiers. (3\

2.3Sketch the circuit symbol of each of the following components

2.3.1Resistor

2.3.2Polarised capacitor

2.3.2

2.4State THREE faults that can occur in diodes (3\

2.5Explain how a vo ltmeter is used when measuring voltage in circuit (4\

2.6Name THREE tools used when soldering components in a vero board (3\

2.7our 10 V supply. Calculate the following:

2.7.1otal resistance of the circuit (3\

2.7.2otal current of the circuit (2\

2.8Give ONE danger of electrostatic charges. (1\ [25] 1204102225

Q3— Section header —

3.1Differentiate between analogue and digital signals (2\

3.2Briefly compare a serial transfer to a parallel transfer. (2\

3.3Convert the following decimal numbers to binary and perform the functions in binary. Convert your answer to decimal. Show ALL the steps. 10 + 10 10 (8\

3.4Use one complement to subtract the following binary numbers 1010 111

3.5Explain the operation of the OR gate and complete its truth table. (6\

3.6Distinguish between latch and flip flop (4\

3.7Define odd parity bit. (2\

3.8Draw a EC symbol of a clocked J K flip flop

3.9Assign an odd parity bit to the binary number (1\ [35] (12041022\ NC96035

Q4— Section header —

4.1Explain each of the following computer terms

4.1.1Hardware

4.1.2Software

4.1.3

4.2Identify each of the following computer components

4.2.3

4.3Distinguish between volatile and non volatile memor y. (4\ [10]10

Q5— Section header —

5.1List FIVE transducers that sense the physical conditions (5\

5.2Explain the operation of a bi metal strip ith the aid of a diagram (5\ [10] TOTAL: 10010

Mark Allocation

Total100 marks

Sections20 + 25 + 35 + 10 + 10 = 100 marks

Paper information

TitleDocument

SubjectElectronic Control And Digital Electronics

LevelNCV Level 2

Document typeQuestion paper

Year2018

MonthNovember

Pages6

Downloads2

Examination context

Decade2010s

Years ago8y

SeasonSpring (SH)

Start dayThursday

Exam periodNovember 2018

Days since exam2,902

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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