Electrical Principles And Practice NCV Level 2 — Document
November 2018 — NCV Level 2 — Electrical Principles And Practice
NCV Level 2
2018
NCV Engineering
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Q1— Section header —
1.1Mass is a scalar quantity. Define ass. (2\
1.2Certain quantities are either too large or too small and are therefore best described by a prefix. Complete the table below by naming the foll owing prefixes PREFIX NAME PREFIX SYMBOL MEANING
1.2.1x 10
1.2.2x 10
1.2.3x 10
1.2.4x 10
1.2.5
1.3The tip of a steel rod is pressed against someone' s skin with unknown force. Cal culate the density of the needle if it has a mass of 0,2 kg and occupies a volume of 0,6 m
Q2— Section header —
2.1A platinum resistance thermometer uses the change in resistance to measure temperature. Suppose at The c oefficient of expansion is 3,92 10
2.2Alternating currents and voltages are represente d by sinusoidal waves. Sketch the sine wave form of an alternating voltage and clearly show its amplitude and frequency (4\
2.3Electrical consumers could request either a single phase or three phase supply from the supply authority. State the comm on voltages associated with these supply systems. (2\
2.4Three phase systems have many advantages compared to single phase systems. Name any THREE such advantages. (3\
2.5magnet is a material or object that produces a magnetic field. State what is meant by the following terms associated with magnetism:
2.5.1Magnetic poles
2.5.2Magnetic flux density
2.5.3
2.6When sketching the lines of magnetic fields, there are some require ments that must be taken into consideration Explain THREE of these requirements. (3\
2.7The magnetic field is the area around a magnet in which objects are affected by magnetic forces. Make a neat sketch to show the magnetic field lines around a b ar magnet. (3\ [25]25
Q3— Section header —
3.1Complete the following sentences by filling the missing word(s\. Write only the word(s\ next to the question number (3.1.1 3. 1. 3\ the ANSWER BOOK.
3.1.1When resistors are connected in series, their to
3.1.2The sum of the voltage drops across each of these series
3.1.3
3.2An electrical circuit contains 12 cell s each with an open circuit voltage of 1,5 V. The cells are grouped as follows: FOUR cells in series with each other. THREE such groupings in parallel with each other.
3.2.1The total EMF of the battery
3.2.2The total internal resistance of the battery
3.2.3
3.3Two resistors with res istances of 3 , respectively are connected in parallel across a battery with a potential difference of 12 V.
3.3.1The total resistance of the circuit
3.3.2
3.4he wiring code of practice requires that the load be balanced across the three phases of a three phase supply. State THREE advantages of load balancing in a three phase system. (3\
3.5Transformers are used to either step up or step down alternating voltages. Briefly explain the operation of a single phase transformer. (3\
3.6A single phase transformer with 300 turns on the primary side and 30 turns on the secondary side draws a current of 0,2 A from a 250 V supply. Calculate the transformers' secondary current. (3\ [25] (12041002\25
Q4— Section header —
4.1The code of practice requires that all exposed conductive parts of an installation be earthed. State what earthing means. (2\
4.2Give THREE reasons why proper earthing is important in e lectrical installations. (3\
4.3Measuring instruments can be classified as digital or analogue instruments. Name THREE advantages of digital meters as compared to analogue meters. (3\
4.4There are mainly two types of moving iron type instru ments: attraction type and repulsion type instruments Briefly explain the operation of an attraction type instrument. (4\
4.5Electrical instruments measure the various electrical quantities such as voltage, current, power, etc. Name THREE basic pr ecautions to be taken when using measuring and testing instruments (3\ [15]15
Q5— Section header —
5.1In the electrical sector, circuit diagrams are very important. Draw a simple light circuit diagram to show how TWO luminaires are controlled by a singl e switch. (4\
5.2Compile a parts list of the circuit drawn in QUESTION
5.1above. (3\
5.3Make a neat sketch to show the wiring diagram of a stove circuit. NOTE: Your sketch must include a double pole isolator. (6\
5.4When drawing electrical circuit diagrams you need to know certain important requirements. Name TWO of these requirements. (2\ [15] (12041002\15
Q6— Section header —
6.1Materials commonly used in the electrical industry can be classified as conductors or insulators and they have specific properties. Copy and complete the following table below: TYPE OF MATERIAL PROPERTIES
6.1.3Aluminium
6.1.5
6.2Batteries are an important source of direct current. State FOUR safety precautions to be taken into account when maintaining lead acid battery. (4\ [10] TOTAL:10
Topics Identified
1
Business Environments
Mark Allocation
Total100 marks
Sections10 + 25 + 25 + 15 + 15 + 10 = 100 marks
Paper information
TitleDocument
SubjectElectrical Principles And Practice
LevelNCV Level 2
Document typeQuestion paper
Year2018
MonthNovember
Pages8
Downloads2
Examination context
Decade2010s
Years ago8y
SeasonSpring (SH)
Start dayThursday
Exam periodNovember 2018
Days since exam2,901
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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