Electrical Principles And Practice NCV Level 3 — Document

November 2018 — NCV Level 3 — Electrical Principles And Practice

NCV Level 3 2018 NCV Engineering

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Q1— Section header —

1.1Define the term nergy. (2\

1.2What happens to an atom when it loses an electron from its outermost shell? (2\

1.3Calculate the resistance of a copper conductor with a length of 5, 75 km and a cross sectional area of 10 mm Take the resistivity of copper to be

1.4ame TWO factors that a change in resistance caused by a rise in temperature depends on. (2\

1.5Temperature coefficient is the effect that temperature has on the resistance of material.

1.5.1State TWO materials that have a temperature coefficient of 0.

1.5.2What effect will temperature have on materials in

Q1— Section header —

Q2— Section header —

2.1Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only ' rue' or ' alse' next to the question number (2.1.1

2.1.5\ the ANSWER BOOK.

2.1.1An emf is induced whenever a conductor cuts or is being cut by the magnetic field.

2.1.2The magnitude of the induced emf is indirectly proportional to the rate at which the magnetic flux passing through the coil is varied.

2.1.3The direction of the induced emf depends on the direction of the field lines.

2.1.4Reluctance is the strength of a magnetic field in a coil of wire.

2.1.5

2.2Classify the TWO main groups of magnets (no description is needed\ (2\

2.3Define the weber (2\ (12041003\ NC890

2.4Magnetomotive force (mmf\ is the strength of a magnetic field in a coil of wire.

2.4.1State the TWO factors that influence mmf. (4\

2.4.2What is the unit of mmf (1\

2.5TWO overhead conductors are supported 85 cm apart. The current flow in each of them is 300 in the same direction.

2.5.1Calculate the force between the two conductors. (4\

2.5.2State whether the force in QUESTION 2. .1 is attractive or repulsive. (2\ [20]20

Q3— Section header —

3.1An unknown resistor (R \is connected in parallel with a 60 combination is then connected in series with a 30 the whole circuit is 6V/0,12 A. Draw the circuit diagram. (2\

3.2With reference to the circuit diagram in QUESTION

3.1, calculate the following:

3.2.1The total resistance of the circuit (2\

3.2.2The resistance of the parallel network (2\

3.2.3The value of the unknown resistor (3\

3.2.4The voltage drop across the series resistor (2\

3.2.5The power dissipated in the 60 (3\

3.3List FOUR of the common causes of battery failure. (4\

3.4

3.4.1The total capacitance (C

3.4.2

Q5— Section header —

5.1State TWO purposes of a yoke as used in the construction of a DC achine in the figure above (4\

5.2List FOUR methods used to improve commutation. (4\

5.3List the FOUR main parts of a basic DC generator. (4\

5.4Make a s ketch of the load characteristic of a shunt generator. (3\

5.5From the circuit in QUESTION

5.4explain why there is a drop of the voltage at full load current. (2\

5.620

Mark Allocation

Total100 marks

Sections15 + 20 + 20 = 55 marks

Paper information

TitleDocument

SubjectElectrical Principles And Practice

LevelNCV Level 3

Document typeQuestion paper

Year2018

MonthNovember

Pages7

Downloads3

Examination context

Decade2010s

Years ago8y

SeasonSpring (SH)

Start dayThursday

Exam periodNovember 2018

Days since exam2,900

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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