Electrical Trade Theory N2 — Document
December 2023 — N2 — Electrical Trade Theory
N2
2023
Nated Engineering
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Q1— Section header —
1.1Choose a term from COLUMN B that matches a description in COLUMN A. Write only the letter (A G\next to the question number (1.1.1
1.1.5\ in the ANSWER BOOK. COLUMN A COLUMN B
1.1.5The ratio of true power to apparent power Smaller EMF values occurring at a specific instant occur before or after the maximum value The value of an alternating current that produces the same amount of
Q2— Section header —
2.1Determine the maximum permissible fault current that a PVC insulated cable, which has aluminium conductors with a cross sectional area of 16 mm can carry for a maximum of 4 seconds. Take the
2.2List TWO uses of the following insulators:
2.2.1Magnesium oxide
2.2.2
2.3Ceramic and porcelain insulators are glazed hat is the purpose of glazing? (2\
2.4Name THREE advantages of a PVC insulated wire armoured cable (3\ [12]12
Q3— Section header —
3.1Three phase systems are protected against phase imbalance List TWO faults that can lead to an imbalance in a three
3.2Explain the operation of the hydraulic magnetic type circuit breaker in the event of short circuit (2\
3.3List THREE causes of high voltage surge that may occur n over head
3.4Explain the purpose of an earth leakage relay (3\ [10]10
Q4— Section header —
4.1State FOUR applications of gel batteries.
4.2State FIVE advantages of lithium ion batteries
4.3What is the recommended current of a gel batter during the bulk charging hase?
Q5— Section header —
5.1Interpoles are smaller poles that are located midway between field poles. Briefly explain the purpose of interpoles. (2\
5.2DC machines are named according to the method in which the field windings are connected relative to the armature. List any TWO types of self excited DC generators (2\
5.3Draw a neat labelled sketch of simple two pole DC machine and clearly indicate field winding, pole shoe, yoke, armature and pole core (6\
Q6— Section header —
6.1Explain the purpose of the following tests in motors
6.1.1Earth continuity test
6.1.2
6.2Draw a neat, fully labelled circuit diagram of a resistance start induction run single phase motor. (4\
Q7— Section header —
7.1Draw a circuit diagram to show how three single phase transformers are connected to form a three phase star star configuration.
7.2The no load current drawn by a single phase transformer is 4 A at a power factor of 0,55 lagging
Q8— Section header —
8.1Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number (8.1.1
8.1\in the ANSWER BOOK.
8.1.1A floating earth is whe non urrent c arrying parts are joined together, forming a zero
8.1.2Portable electrical appliances, such as electric drills, are not required to be earthed if they meet the requirements for double insulation
8.1.3The voltage that prevents itself simultaneously across two accessible points during an insulation fault is referred to as a touch voltage
8.1.4Bonding to earth means electrically connecting to earth all current carrying conductive parts of an electrical installation.
8.1.5According to SANS regulation 5.1.3.1, new installation shall be connected to the supply even though the s upply does not include protective conductor.
8.1.6According to regulation 6.12.3.3, metallic frames and metallic enclosures of electrical equipment shall be made electrically continuous.
8.1.7
8.2What does SANS 10142 regulation 5.1.3.3 stipulate with regard to earth leakage protection? (3\ [10]10
Q9— Section header —
9.1Explain what a galvanometer is. (2\
9.2Explain how the range of a galvanometer can be extended (1\
9.3A moving coil instrument with a n internal resistance of 10 ohms gives a full scale deflection when a
Q10— Section header —
10.1Explain the following concepts:
10.1.1Electrical reticulation network
10.1.2Feeder
10.1.3
10.2List TWO sources that are used to generate renewable energy (2\
10.3State FOUR advantages of the ring feeder system (4\ [12] TOTAL: 10012
Mark Allocation
Total100 marks
Sections12 + 12 + 10 + 10 + 10 + 8 + 10 + 10 + 6 + 12 = 100 marks
Paper information
TitleDocument
SubjectElectrical Trade Theory
LevelN2
Document typeQuestion paper
Year2023
MonthDecember
Pages9
Downloads7
Examination context
Decade2020s
Years ago3y
SeasonSummer (SH)
Start dayFriday
Exam periodDecember 2023
Days since exam1,046
About Electrical Trade Theory 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
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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
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checking answers
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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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