Electrical Trade Theory N2 — Document
August 2018 — N2 — Electrical Trade Theory
N2
2018
Nated Engineering
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Q1— Section header —
1.1State THREE general methods of installing armoured cables. 3\
1.2Indicate whether the following statements are TRUE or FALSE. Choose the answer and write 'true' or 'false' next to the ques tion number (1.2.1
1.2.2\in the ANSWER BOOK.
1.2.2In a purely resistive circuit the cu rrent and the power will be in hase with each other. In a purely capacitive circuit the current would lead the voltage by 180 (2
1.3Determine the requ ired current carrying capacity of a cable that is to supply a sin gle phase inductive load of 15 k W at a power factor of 0,9.
1.4Give a possible explanation for permissible volt drop between the supply point and any outlet point. (2\
1.5The declared voltage at the point of supply to a block of flats is 220 volts. Determine the minimum permissible voltage at any point in the block of flats. (2\ [11]11
Q2— Section header —
2.1One of the most common jointing method s is the resin joint (Scotch cast oint\ State SIX steps of a resin joint in a low
2.2Compare the operation and function of di sconnectors relays
2.2.1Operation (3\
2.2.2Function (3\ [12] 1104187212
Q3— Section header —
3.1Draw a neat labelled diagram of a face plate starter related to
3.2Draw a neat labelled diagram to show how the reversal of direction of rotation for a shunt motor is achieve d. (3\
3.3What is the difference between a cumulatively compounded motor and a differentially compounded motor? (2\
3.4What is the main disadvantage of a shunt motor? (1\ [12]12
Q4— Section header —
4.1Draw a neat, la belled circuit diagra m of a capacitor star induction run motor. (4\
4.2Name TWO types of rotors found in induction motors. (2\
4.3What is squirrel cage rotor? (2\
4.4Draw a load characteristic of a universal motor and l abel both axes. (3\
4.5The overcurrent protection devices used for motors must meet certain requirements. Discuss these requirements under the following headings.
4.5.1ime delay
4.5.215
5.1What is the meaning of the term earthed (3\
5.2Indicate whether the following statements are TRUE or FALSE. Choose the answer and only write 'true' or 'false' next to the question number (5.2.1
5.2.4\n the ANSWER BOOK.
5.2.4The e arthi ng of electricity associated equipment means connecting the current carrying exposed conductive parts of appliances to
5.3The metal frame of a stove has an earth terminal. Explain the earthing chain that exists to eventual ly connect the stove to the earth electrode outside the house. (3\
5.4What is the aim of bonding? (2\ [12]12
Q6— Section header —
6.1Describe the construction of a bimetal type overload relay (3\
6.2Explain how surge protection is activated. (2\
6.3Explain where the earth leakage relay must be installed in a domestic electrical installation. (3\
6.4Stat e the purpose of an earth leakage protection device. (2\ [10] 1104187210
Q7— Section header —
7.1What is the function of a frequency meter? (2\
7.2A voltmeter labelled A, an a mmeter labelled B and a frequency meter labelled C are connected in cir cuit to measure the voltage, c urrent and frequency respectively
7.2.1State if the vol tmeter is connected properly. If you answer no, how should it be connected? (1\
7.2.2State if the ammeter is connected properly. If you answer no, how should it be connected? (1
7.3Explain how the watt hour meter is able to give a readin g which is proportional to the energy consumed. (2\ [6] 000000% 6
Q8— Section header —
8.1An 11 000 V to 380 V delta/ st ar three phase tr ansformer unit is 96% efficient. It delivers 500 k W at a power factor of 0,9. Calculat
8.1.2The secondary phase voltage The primary line circuit (1\ (4\
8.2What is the purpose of transformer tappings? (2
8.3A single phase transformer has 800 turns on the prim ary winding which is connected to a 240 V AC supply. The voltage and current on the secondary side is 16 volts and 8 A respectively. Determine:
Q9— Section header —
9.1Make labelled s ketches of the IE C symbols for the TWO common types of transistor used. (4\
9.2Draw a neat circuit diagram that will illustrate how a singl e diode can be used as a half wave rectifier. (2\
9.3Expl ain what is meant by continuous current rating (2\
9.4Explain how a thyristor operates as a power controlling device. (2\ [10] TOTAL: 10010
Mark Allocation
Total100 marks
Sections11 + 12 + 12 + 15 + 12 + 10 + 6 + 12 + 10 = 100 marks
Paper information
TitleDocument
SubjectElectrical Trade Theory
LevelN2
Document typeQuestion paper
Year2018
MonthAugust
Pages8
Downloads4
Examination context
Decade2010s
Years ago8y
SeasonWinter (SH)
Start dayWednesday
Exam periodAugust 2018
Days since exam2,993
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
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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