Electronic Control And Digital Electronics NCV Level 4 — Memo

November 2023 — NCV Level 4 — Electronic Control And Digital Electronics

NCV Level 4 2023 NCV Engineering

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Q1— Section header —

1.1

1.3.1

1.3.2NOTE: ONE mark for the correct substitution TWO marks if the answer is converted to mH, if th e answer is not converted give ONE mark.

1.3.3NOTE ONE mark for the correct angle ONE mark for current vector and 1 for capacitor ONE mark for the impedance vector (4\ [20]20

Q2— Section header —

2.1Supply voltage Output load Operating point of active device Stray capacitance Temperature variations The high frequency circuitry then switches the r

2.4Reverse breakdown voltage is the value of the reverse voltage from the cathode to the anode at which the device breaks into the avalanche region starts conducting heavily. Holding current is the value of the anode current below which the

2.5It provides a higher voltage gain than the coupled amplifier. Mobile telephones omputers Camcorders [30]30

Q3— Section header —

3.1Maximum collector emitter voltage the replacement transistor should have ceo rating equal to or higher than the original transistor. Maximum emitter base voltage the replacement transistor should have

3.2.1False

3.2.2False

3.2.3True

3.2.4True

3.2.5

3.3When a copper track breaks it may leave an invisible hairline of copper. This results in an intermittent connection on the track, po ssibly causing a short circuit. The relationship between components and circuit diagrams may be

3.4to determine if electrical equipment is safe and working correctly Investigation of the cause of malfunction in machinery, especially electronic equipment. [20]20

Q4— Section header —

4.1.1When we AND or OR two variables, the position or order of the variables makes no difference to the result. For example: A + B = B + A, AB = BA

4.1.2hen we AND or OR several variables, the grouping of the variables does not affect the result For example: A+(B+C\ = (A+B\+C, A(BC\ (AB\

4.1.3If we AND several variables and the result with a single variable is equivalent to ANDing the

4.2.1= 1100

4.2.2

4.3Encoder is a logic circuit that converts decimal inputs to binary outputs while decoder is a logic circuit that converts from binary to decimal. (4\

4.4Ensure that the software is compatible with the operating system. Make a backup of your existing drivers. [15]15

Q5— Section header —

5.1.1solid state control device that can be programmed to control process or machine operations.

5.1.2It is self maintaining circuit in that after being energised it maintains that state until another input is received. It keeps the output energised even when the input is off. (Any ONE

5.1.3Refers to the programmed instructions that drive one output; a complete control program may have several rungs.

5.1.4An electrically operated device that mechanically switches electrical circuits.

5.1.5It is a microprocessor based control system that replaces central relays, counters, timers and sequencers. Execute and hold the user program. (Any ONE

5.2ONE mark for X000 ONE mark for output Y000 ONE mark for Y000 latch circuit ONE mark for T.05 min output ONE

Mark Allocation

Sections20 + 30 + 20 + 15 + 15 = 100 marks

Paper information

TitleMemo

SubjectElectronic Control And Digital Electronics

LevelNCV Level 4

Document typeNCV Engineering

Year2023

MonthNovember

Pages9

Downloads4

Examination context

Decade2020s

Years ago3y

SeasonSpring (SH)

Start dayWednesday

Exam periodNovember 2023

Days since exam1,076

About Electronic Control And 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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