Digital Electronics N4 — Document

April 2018 — N4 — Digital Electronics

N4 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 4 pages 📝 30 items found

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This section provides a quick preview of questions from the document. It may not display every question or the complete wording of each one. For the full content, including diagrams, tables and other information, view the original PDF above.

Q1— Section header —

1.1What is the radix of a decimal number? (1\

1.2Why is the binary number system used in computer circuitry? (2\

1.3Explain the term weighted code and also give an example of the code. (3\

1.4How many flip flops are needed for a module 7 counter? (1\

1.5Explain the term propagation delay when referring to an IC (2\

1.6Use t he laws and identities of Boolean a lgebra to simplify the following expressions:

1.6.2ABC ABC

1.6.3XY

1.6.5

1.7Convert 11001101101 XS3 to decimal. (3\ [17]17

Q2— Section header —

2.1Use to calculate X+Y if X= FE,7 and Y 1D,5

2.2Convert each of the following numbers to their binary equivalent and complete the calculation in the binary number system. Use 1's complement and convert the final answer to the decimal system.

2.2

2.21010110,1 11011

2.2.324

Q3— Section header —

3.1Simplify the following Boolean expressions:

3.1.1+ ABC = F

3.1.2C(A+ \ + A(B+ B = (2 6\

3.2Draw the circuit diagram o f the Boolean expressions below. D NOT simplify the expression

3.2.1AB BC + ABC = F

3.2.2X + YZ XZ = F (2 6\ (12\ [24]24

Q4— Section header —

4.1Draw the circuit diagram of a serial binary adder. Use 0101 and 0110 as inputs (8\

4.2Make a neat labelled sketch of a module 7 up counter. Also include a truth table and the timing diagram for 8 clock pulses. (10\ [18]18

Q5— Section header —

5.1Draw a block diagram of the r amp type A/D converter. (10\

5.2Draw a neat circuit di agram of a 1 line to 4 lines de multiplexer. (7\ [17] TOTAL: 10017

Mark Allocation

Total100 marks

Sections17 + 24 + 24 + 18 + 17 = 100 marks

Paper information

TitleDocument

SubjectDigital Electronics

LevelN4

Document typeQuestion paper

Year2018

MonthApril

Pages4

Downloads3

Examination context

Decade2010s

Years ago8y

SeasonAutumn (SH)

Start daySunday

Exam periodApril 2018

Days since exam3,113

About 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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File size303.9 KB

Pages4

Archived on8 September 2026

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