Electrical Principles And Practice NCV Level 2 — Memo

February 2020 — NCV Level 2 — Electrical Principles And Practice

NCV Level 2 2020 NCV Engineering

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2.2.2

2.2.3

2.3.1Three phase current is cheaper to gene rate than single phase current. A three phase distribution system can also provide single phase current.

2.3.2220 V/230 V/240 V single phase 380 V/400 V three phase (2\

2.4(3\

2.5Electromagnetism occurs when an electric field in a conductor produces a magnetic field in a conductor (2\

2.6Place your right hand over the coil with your fingers pointing in the direction of the current and with your thumb at 90 to your fingers. Your thumb will point in he direction of the north pole. (3\ [25]25

Q3— Section header —

3.1.10,1 0,1 0,1

3.1.2(1\

3.1.3R+r +0,

3.2=2+5+3

3.3

3.4The total current will be 0 A (2\

3.5Load balancing is the process whereby the load in a three phase , four wire system is split as evenly as possible to prevent overloads in any part of the circuit (2\

3.6(1 for sketch + 3 for labels\ (4\

3.7.1

3.7.2turns

3.825

Q4— Section header —

4.1When current flows through the coil, This causes the coil to pivot.

4.2Small DC generator to produc e two different voltage levels Calibrate d meter to measure resistances

4.3Measures c urrent in various sub circuits Checks the sta rting current on an AC machine Measures balanced and unbalanced loads

4.4To eliminate parallax error, the user must look directly at the pointer on the scale when taking measurements. (2\

4.5An instrument transformer is used to enable a small measuring instrument to measure high voltage and high current. (2\

4.6A wattmeter is used to measure power. (1\ [15]15

Q5— Section header —

5.1(6\

5.2.1Single phase stove circuit (1\

5.2.2A = Live conductor: 6/8 mm B = Neutral conductor: 6/8 mm C = Earth conductor: 6/8 mm D = Circuit breaker: (8\

Q6— Section header —

6.2Pin insulator rain insulator

6.3Metal Soft and flexible Ductile and malleable Weatherproof [10] TOTAL:10

Mark Allocation

Sections25 + 25 + 15 + 15 + 10 = 90 marks

Paper information

TitleMemo

SubjectElectrical Principles And Practice

LevelNCV Level 2

Document typeNCV Engineering

Year2020

MonthFebruary

Pages7

Downloads3

Examination context

Decade2020s

Years ago6y

SeasonSummer (SH)

Start daySaturday

Exam periodFebruary 2020

Days since exam2,446

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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