Logic Systems N3 — Document

November 2022 — N3 — Logic Systems

N3 2022 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 7 pages 📝 47 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 —

1.132,5 16 + 32,5 + 32,5 10 Convert the final answer to the hexadecimal system.

1.2

1.3C4,6 16 2,4 Use the one's complement method and convert the final answer to the octal system.

1.420

Q2— Section header —

2.1What does ASCII stand for? (2\

2.2Decode the following word which is in the ASCII code: 011 1000 011 1110 010 0001 010 0101 101 0001 (5\

2.3Encode or decode each of the following to the code/number system indicated

2.3.1174 10 to the G ray code (3\

2.3.2The 2421 BCD code 1011 1101 to its decimal equivalent (2\

2.3.31000 0111 XS3 (Excess 3\de to decimal (2\

2.4Sketch the block diagram and complete the truth table for a full adder which use two half adders and an OR gate. (6\ [20] (808027320

Q3— Section header —

3.1The NOR gate is a commonly used gate.

3.1.1Draw and fully lab el the switch circuit for a NOR gate. (3

3.1.2Sketch the IEC symbol for a NOR gate. (1\ 3. Given below is a circuit diagram that consists of logic gates. Copy and complete the truth table for the circuit:

3.4.1 An inclusive OR gate

3.4.2 A NAND gate

3.420

Q4— Section header —

4.1Define a latch as used in digital electronics. (1

4.2Draw the truth table of a clocked RS flip flop (4

4.3Name TWO types of flash memory devices. (2\ 4. Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A D\ next to the question n umber

4.4.5\n the ANSWER BOOK.

4.4.1 A major disadvantage of the mask ROM ery expensive to change stored data when system

4.4.2 How can UV erasable PROMs be recogni ed?

4.4.3 Why is a refresh cycle necessary for dynamic RAM? The refresh cycle keeps the charge on the capacitor cells

4.4.4 A J K flip

4.4.5 must be refreshed periodically or it will lose storage will maintain storage even if power is removed

4.5.1 Small circle on the clock input.

4.5

4.7.1 SD

4.720

Q5— Section header —

5.1Indicate whether the following statements are TRUE or FALSE by writing only 'True' or ' alse' next to the question number (5. .1 5.

5.1An asynchronous counter differs from a synchronous counter in the method of clocking.

5.1An example of an asynchronous counter is a ripple counter.

5.1

5.2Draw a fully labelled diagram of module 7 counter using JK flip flops and logic gates. (6\ 5.

5.3.5 \in the ANSWER BOOK. COLUMN A COLUMN B

5.3.1

5.3.2

5.3.3

5.3.4

5.3.5 Time requ ired to change the pulse from 90% to 10% of its maximum. The time which elapses from

5.4Draw a fully labelled diagram of a synchronous decade counter using JK flip flops. (6\ [20] TOTAL: 10020

Mark Allocation

Total100 marks

Sections20 + 20 + 20 + 20 + 20 = 100 marks

Paper information

TitleDocument

SubjectLogic Systems

LevelN3

Document typeQuestion paper

Year2022

MonthNovember

Pages7

Downloads3

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,439

About Logic Systems 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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