Electrical Technology Paper 1 (English)

November 2011 — Grade 12 / Matric — Electrical Technology

Past Paper 2011 Grade 12 English

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🎯 200 marks ⏱️ 3h 📄 12 pages 📝 99 items found ∑ 2 math symbols 📚 2 topics

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Q1— Section header —

1.1List THREE disadvantages of a nuclear power stat ion, based on the recent

1.2The majority of power stations in South Africa are coal fired. Name TWO

1.3Explain why HIV/Aids can have a negat ive impact on the workforce of the

1.4State TWO skills that a successf ul entrepreneur should have. (2\

Q2— Section header —

2.1The technological process has four with regard to a step-up transformer:

2.1.1Process (2\

2.1.2Output (2\

2.2Describe why it is important to eval uate a completed electrical product against the original design of the product. (3\

2.3List THREE appropriate methods of marketing a product. (3\

Q3— Section header —

3.1Name TWO electrical safety devic es that protect equipment under fault conditions. (2\

3.2Fault-finding is done on a motor control panel. Name and describe ONE before the test is started. (2\

3.3Explain why no person under the influence of drugs ma y enter or remain in a workplace where machinery is used. (2\

3.4Name and describe TWO safety pr ecautions that must be taken when working with portable electrical equipment. (4\ phase. (1)1

Q5— Section header —

Q4— Section header —

4.1Give ONE reason why electricity is ge nerated in three phase and not in single

4.2Determine the value of the line current if the phase current is 300 A in a delta-

4.3

4.3.1The line voltage (3\

4.3.2The power supplied by t he alternator at full load (3\

Q5— Section header —

5.2State how a decrease in frequency will a ffect the inductive reactance of an

5.3Explain the term impedance with reference to an RLC circuit. (2\

5.4Refer to FIGURE 5.1. FIGURE 5.1: RLC SERIES CIRCUIT Given: L = 0,17 H f = 50 Hz Calculate:

5.4.1The capacitive react ance of the capacitor (3\

5.4.2The inductive reactance of the inductor (3\

5.4.3The impedance of the circuit (3\ R = 100 L = 0,17 H

5.5Refer to FIGURE 5.2.

5.5.1The inductive reactance of the inductor (3\

5.5.2The capacitive react ance of the capacitor (3\

5.5.3The resistance of the resistor (3\

5.5.4The supply current of the circuit (3\

5.6Draw the phasor diagram of the abov e circuit. Indicate the direction of

Q6— Section header —

6.1.1Name the unit of the axes numbered and and the labels

6.1.2Draw a fully labell ed symbol of a DIAC. (2\

6.1.3With the aid of the characte ristic curve shown in FIGURE 6.1,

6.2Draw a fully labelled sy mbol of a TRIAC. (3\

6.3Describe how a TRIAC is switched on. (3\

6.4the soldering iron

6.2: TEMPERATURE CONTROL

6.4.1If S is closed, what will the vo ltage across the soldering iron be? (1\

6.4.2When S is open, the temperature c ontrol part of the circuit becomes active. Explain what will happen to the temperature of the

6.4.3What disadvantage does an SCR have in AC circuits? (1\

6.5Explain why the current rating plays an important role in determining the

Q7— Section header —

7.1Name TWO amplifier (op amp\(2\

7.2Name ONE disadvantage of an oper ational amplifier (op amp\(1\

7.3List THREE characteri amplifier (op amp\(3\

7.4Describe the term with reference to an oper ational amplifier (op

7.5Draw the diagram of an operational amplifier (op am p\

7.6Refer to FIGURE 7.1.

7.6.1Name the operational amplifie r circuit in FIGURE 7.1. (1\

7.6.2With the given input signal at the non-inverting input, draw both the

7.6.3Explain the function of R in the circuit. (3\

7.6.4Explain what will occur to the gain of the operational amplifier (op is increased.

7.6.5What is the function of R in the circuit? (2\

Q8— Section header —

8.1Give ONE function of a transformer. (2\

8.2Name ONE loss that occurs in three-phase transformers. (1\ - + Vin Vout 450 A.

8.3A three-phase transformer with a turns ratio of 50 : 1 is connected in delta- star. The supply voltage is 11 kV and the secondary phase current is Given: Calculate:

8.3.1The secondary phase voltage (3\

8.3.2The secondary line voltage (3\

8.3.3The primary phase current (3\

8.3.4The primary line current (3\

Q9— Section header —

9.1What do the letters represent? (1\

9.2Name the FOUR main parts of a PLC. (4\

9.3Explain the term when referring to a PLC. (3\

9.4Draw the ladder logic symbol for each of the following:

9.4.1Normally open switch (1\

9.4.2Normally closed switch (1\

9.4.3Relay (1\

9.5Name THREE advantages of PLCs in comparison to relay control. (3\

9.6Name THREE basic devices used in programming PLCs. (3\

9.7Name the THREE programming languages used in programming PLCs. (3\

9.8With reference to an OR

9.8.1The logic symbol (2\

9.8.2The circuit diagram, using two switches and a lamp to simulate the

9.8.3The ladder logic diagram (3\ of the circuit in FIGURE 9.1.

9.9Draw the ladder logic diagram

Q10— Section header —

10.1With reference to insulation resist ance tests on the stator of a three-phase

10.1.1Name the type of instrument you would use to do the test. (1\

10.1.2Describe why it is important to test the insulation resistance between the windings and the

10.1.3Describe the resistance readi ng you would expect when measuring between the windings of the motor.

10.1.4Use the exact lay-out in FIG URE 10.1, redraw the figure and draw he windings connected in star. THREE-PHASE INDUCTION MOTOR supply. The motor is 100% efficient with a power factor of 0,9 at full load.

10.2A three-phase 15 kW induction motor is connected in delta to a 380 V/50 Hz Given: f = 50 Hz = 100% Calculate:

10.2.1The current drawn from the supply (3\

10.2.2The apparent power of the motor (3\

10.2.3The phase current of the motor (3\

10.3Explain why a star-delta starter is used to start three-phase induction motors. (3\

10.4Name THREE parts of a three-phase induction motor. (3\

10.5State TWO possible causes of overheati ng in a three-phase induction motor. (2\

10.6How are the stator windings spaced in a three-phase induction motor? (1\

10.7After a motor has been started and is running, what other function does the FL

Mathematical Content

f(x)trig

Topics Identified

CircuitsMachines

Mark Allocation

Total200 marks

Sections10 + 10 + 10 + 10 + 30 + 25 + 25 + 15 + 35 + 30 = 200 marks

Per-question sum68 marks

Paper information

SubjectElectrical Technology

Year2011

SessionNovember

TypePast Paper

PaperPaper 1

LanguageEnglish

Pages13

Downloads5

Examination context

Decade2010s

Years ago15y

SeasonSpring (SH)

Start daySaturday

Exam periodNovember 2011

Days since exam5,469

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