Electrical Principles And Practice NCV Level 3 — Memo

November 2020 — NCV Level 3 — Electrical Principles And Practice

NCV Level 3 2020 NCV Engineering

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Q1— Section header —

1.1.1Free electrons have left the valence shell.

1.1.2Potential difference is the difference in electrical potential between two points in a circuit.

1.1.3

1.2The resistance of carbon decreases as the temperature increases. (2\

1.3The variation in resistance with a change in temperature is so small that is negligible. (2\

1.4Resistivity is directly proportional to the resistance of a material. (2\

1.515

Q2— Section header —

2.1.1

2.3.2

2.4.2If the index finger points in the direction of the magnetic field and the thumb points in the direction of motion, then the middle finger will point in the direction of the induced emf. [20]20

Q3— Section header —

3.1=4+5

3.2.1

3.2.2

3.4.1

3.4.2

3.5

3.7(4\

3.8Line current is the current flowing through any line conductor. (2\ [30]30

Q4— Section header —

4.1It is used to measure current Two wattmeter method for balanced or unbalanced loads. Three wattmeter method for a three phase four wire system for balanced and unbalanced loads. (3\

4.3

4.4.1+

4.515

Q5— Section header —

5.1.1In a s eries generator the field windings are connected in series with the armature.

5.1.2In a hunt generator the field windings are connected in parallel with the armature.

5.1.3

5.2A DC motor starter is used to limit the initial starting current of the motor to a safe value. (2\

5.3In a lap winding the two ends of each armature coil are connected to adjacent commutator segments, whilst in a wave winding the two ends of each coil are connected to the commutator segments placed between adjacent poles of

Mark Allocation

Sections15 + 20 + 30 + 15 + 20 = 100 marks

Paper information

TitleMemo

SubjectElectrical Principles And Practice

LevelNCV Level 3

Document typeNCV Engineering

Year2020

MonthNovember

Pages7

Downloads8

Examination context

Decade2020s

Years ago6y

SeasonSpring (SH)

Start daySunday

Exam periodNovember 2020

Days since exam2,169

About Electrical Principles And Practice 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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