Logic Systems N4 — Document

August 2021 — N4 — Logic Systems

N4 2021 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 6 pages 📝 35 items found

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Q1— Section header —

1.1Give the symbols of the hexadecimal number system. (1\

1.2Give the truth table, the Boolean expression and the circuit symbol of a two input NOR gate. (3\

1.3Determine the one s complement of (1\

1.4Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only True or False next to the question number (1.4.1

1.4.5\n the ANSWER BOOK.

1.4.1The amplitude and time remain constant in an analogue signal.

1.4.2There is no steady state in a digital signal.

1.4.3The contents of the non volatile memory are erased when power is switched off.

1.4.4An ON state in a digital pulse can also be represented by a

1.4.5One of the advantages of digital signals is that they can be transmitted over a long distance. (5 1\ (5\

1.5Simplify the Boolean expressions below:

1.5.4(4 1\ (4\

1.6Determine the simplest Boolean expression for the Karnaugh maps given below. Redraw each Karnaugh map and show the groupings.

1.6.100 01 11 10 00

1.6.200 01 11 10 00 01

1.6.300 01 11 10 00 01

Q2— Section header —

2.1Convert each of the following numbers to their BINARY equivalents and then complete the calculations in the binary number system Show all conversions.

2.1.1Use one s complement subtraction. Convert the final answer to the octal system. (6\

2.1.2Convert the final answer to the hexadecimal system (6\

2.1.3Convert the final answer to the decimal system (6\

2.2What does ASCII stand for? (2\

2.3Encode the following into the ASCII code: T u K s ! (5\ [25] AB CD AB CD25

Q3— Section header —

3.1Draw the circuit diagram of the following Boolean expression . DO NOT change or simplify the expression s.

3.1.1(5\

3.1.2(5\

3.1.3(5\

3.2Design a circuit that consists of NAND gates only and will provide a binary 1 at the output when the majority of the three inputs A, B and C are at binary 1. Show the following:

3.2.1The truth table (2\

3.2.2The Boolean simplification (5\

3.2.3The circuit diagram (3\ [25]25

Q4— Section header —

Q5— Section header —

Mark Allocation

Total100 marks

Sections20 + 25 + 25 + 20 + 10 = 100 marks

Paper information

TitleDocument

SubjectLogic Systems

LevelN4

Document typeQuestion paper

Year2021

MonthAugust

Pages6

Downloads4

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,896

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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