Logic Systems N3 — Document

December 2023 — N3 — Logic Systems

N3 2023 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 6 pages 📝 52 items found 🔑 1 key info

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Q1— Section header —

1.2Briefly describe a half subtractor. (2

1.3Calculate the following and show all your conversions and calculations

1.3.1from 16 10 in the binary number system and convert the final answer to the hexadecimal number

1.3.2Multiply 25,5 10 by 2,25 10 in the binary number system and convert the answer back to the decimal number system.

1.4FIGURE 1 is truth table

Q1— Section header —

Q2— Section header —

2.1Write a short definition of each of the following terms as applied in data communication and coding

2.1.1Hamming code

2.1.2Self complementing code

2.1.3ASCII c ode

2.1.4Weighted code

2.1.5EBCDIC code (5\

2.2Use the Hamming code to add the necessary parity bits to the following word: 1101 01 (6\

2.3Encode or decode the following numbers as indicated and show the work ing

2.3.1Convert 101010000101 XS3 CODE to a decimal number.

2.3.2Convert 657 10 to an 8421 BCD code.

2.3.3 Convert 264 10 to the Gray code. (3 3\ (9\

3.1FIGURE 2 shows the circuit of the 7041 IC package that contains four 2 input NAND gates . A nswer the following

3.1.1What would you connect to PIN 7?

3.1.2What would you connect to PIN 14? (2\

3.2Draw a switch circuit for each of the following logic gates

3.2.1NOT gate

3.2.2OR gate

3.2.3AND gate (3 3\ (9\

3.3Compare bi polar IC technology and MOS technology in terms of the following:

3.3.1Input voltage

3.3.2Power consumption

3.3.3Speed (6\

3.4Draw a circuit diagram of a 2 input DTL NOR gate. (3\ [20]20

Q4— Section header —

4.1State FIVE important characteristics that should be use when comparing different types of memories.

4.2Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'F alse' next to the question number (4.2.1

4.2.5\in the ANSWER BOOK.

4.2.1A d ynamic memory cell is always a MOS type.

4.2.2A static MOS memory cell consists of a flip flop with a capacitive element.

4.2.3The advantage of a bi polar cell is that it has greater power consumption.

4.2.4An optical disc is an example of magnetic storage.

4.2.5RAM stands for Read Access Memory. (5

4.3What is the meaning of the following flip flop

4.3.1 Leading edge triggered flip flop

4.3

4.4Draw a logic circuit of a clocked D type flip flop that employs inverter and

Q5— Section header —

5.1With reference to pulse characteristics , explain what is meant by the following imes

5.1.1Delay time

5.1.2Storing time

5.1.3Switch on time

5.1.4

5.2Briefly explain what is meant by module 7 counter (2\

5.3What is a ring counter? (2\ Draw a labelled diagram of

Mark Allocation

Total100 marks

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

Key Information

Contact Number0101000010

Paper information

TitleDocument

SubjectLogic Systems

LevelN3

Document typeQuestion paper

Year2023

MonthDecember

Pages6

Downloads1

Examination context

Decade2020s

Years ago3y

SeasonSummer (SH)

Start dayFriday

Exam periodDecember 2023

Days since exam1,044

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

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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.

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A practical revision approach

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