Digital Electronics N4 — Document

April 2020 — N4 — Digital Electronics

N4 2020 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 7 pages 📝 61 items found

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Q1— Section header —

1.1Various options are given as possible answers to the following questions. hoose the answer y applying the laws and identities of Boolean algebra, and write only the letter (A D\ next to the question number (1.1.1

1.1.5\ in the ANSWER BOOK.

1.1.1(A + B\A + C\ A + BC

1.1.2A + AB A + B A + B

1.1.3AA + AB

1.1.4A + A

1.1.5

1.2Complete the following sentences by writing down the missing word or words next to the question number (1.2.1

1.2.5\ in the ANSWER BOOK.

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

1.3Choose a term from COLUMN B that matches a description in COLUMN A. Write only the letter (A E\ next to the question number (1.3.1

1.3.5\ in the ANSWER BOOK. COLUMN COLUMN

1.3eriod that amplitude of square wave remains equal to or above 90% of the final maximum value eriod that amplitude of square wave remains below or equal to 10% of the

1.4Indicate whether the following statements are TRUE or FALSE by writing only rue' or ' alse' next to the question number (1.4.1

1.4.5\ in the ANSWER BOOK.

1.4.1The 2421 code is a self complementing code.

1.4.2The hamming code is an error detection code.

1.4.3

1.4.4Fan out is the amount of logic gates present in a single chip.

1.4.5

1.5Choose ONE term from the list below for each of the following descriptions. Write only the term next to the question number (1.5.1

1.5.5\ in the ANSWER BOOK. weighted latch multivibrator

1.5.1mallest unit of data

1.5.2lectronic circuit used to implement a variety of simple two state devices such as timers and flip lops

1.5.3ircuit with two stable states used to store state information

1.5.4eliability of loading factor of an IC device

1.5.5

1.6Choose the correct term from those in brackets. Write only the term next to the question number (1.6.1

1.6.5\ in the ANSWER BOOK.

1.6.1The (full/half\ adder is used to add three variables A, B and C.

1.6.2A (shift register/decoder\ converts binary to decimal equivalents.

1.6.3An intersection of two variables is known as a (maximum/minimum\ term.

1.6.4The xclusive (OR/NOR\ function is also known as the equality comparator.

1.6.530

Q2— Section header —

2.1Subtract each of the following by means of the s complement and convert the final answer to the decimal system

2.1.158,75 46,5 (6\

2.1.2C, A 7, B (6\

2.2Calculate the following in their binary form and convert the final answer to the decimal system

2.2.1

2.2.2

2.3Convert the following codes as indicated

2.3.1101101 to Gray

2.3.228,4 to XS3

2.3.32A, F8 16 to binary (3 (6\ [30]30

Q3— Section header —

3.1Simplify the following Boolean expression

3.1.1F = X (X + Y\ (X + Y + Z\ (6\

3.1.2F= (A A B\ (B A B\ (4\

3.216

Q4— Section header —

4.1it JK shift register (right shift\ (6\

4.2Synchronous up counter (8\ [14]14

Q5— Section header —

5.1Successive approximation (5\

5.210

Mark Allocation

Total100 marks

Sections30 + 30 + 16 + 14 + 10 = 100 marks

Paper information

TitleDocument

SubjectDigital Electronics

LevelN4

Document typeQuestion paper

Year2020

MonthApril

Pages7

Downloads4

Examination context

Decade2020s

Years ago6y

SeasonAutumn (SH)

Start dayWednesday

Exam periodApril 2020

Days since exam2,385

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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