Electrical Technology Digitals Memo 1 (English)

November 2021 — Grade 12 / Matric — Electrical Technology

Memo 2021 Grade 12 English

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🎯 200 marks 📄 5 pages 📝 61 items found ∑ 1 math symbols 📚 2 topics

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2.1All calculations must show the formulae.

2.2Substitution of values must be done correctly.

2.3All answers MUST contain the correct unit to be considered.

2.4Alternative methods must be considered, provided that the correct answer is obtained.

2.5Where an incorrect answer could be carried over to the next step, the first answer will be deemed incorrect. However, should the incorrect answer be carried over correctly, the marker has to re calculate the values, using the incorr

1.1(1\

1.2(1\

1.3(1\

1.4(1\

1.5(1\

1.6(1\

1.7(1\

1.8(1\

1.9(1\

1.10(1\

1.11(1\

1.12(1\

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1.14(1\

1.15(1\ [1 Electrical Technology: Power Systems DBE/

Q2— Section header —

3.4.3(3 67,08 120\ (150 60 (X

3.4.4(3\

3.5.1 At resonance Z = R = 20 (3\

3.5.2 (3\

3.5.3 (3\ NOTE: X over R is also accepted

3.5.4The phase angle would be zero because X is equal to X and thus = V

4.2.4(3\

4.3Less current drawn from the supply Reduced monthly electricity bill. Reduced heat generated by equipment that will then last longer. Less maintenance of equipment.

4.4.1The meter shows a lagging power factor. (1\

4.4.2The connected load is predominantly inductive

4.4.3By connecting capacitors in parallel with the load By using synchronous motors. By using phase advancers. (1\

4.5.1(3\

4.5.2The phase angle. Power factor. (2\

4.5.3The meters can easily be connected to the lines. The same connection is used for star or delta connected loads It is a more economical method of load measurement. (2\

6.1Cranes. Conveyor belt systems. Lathes. Drill presses Bench grinders.

6.1Number of pole pairs. Frequency of the supply. (2\

6.2.1This motor is connected in delta. (1\

6.2.2Swop any TWO of the supply lines (1\

6.2.3Disconnect the supply lines from the motor. Remove the internal connecting plates. (2\

6.3.1(3\

6.3.2(3\ rpm 750 60 50 60

6.3.3(3\

6.4.1MC (1\

6.4.2MC is a hold out contact ensuring that MC

6.4.3If either motor 1 or motor 2 is overloaded the whole circuit will be isolated. OR If any one of the two overload relays are activated by either O or

6.4.4When START 1 is pressed MC will energise. This will immediately close contacts MC

6.4.5If contact MC is faulty and permanently closed contactor MC

7.1.3Transistor Relay (1\

7.2Scan time is the time the PLC t akes to complete one scan cycle. (2\

7.3Software is the machine language installed on a computer or written into a that instructs it to interact with its input and output hardware. (3\

7.4.1A sensor is a device that detects physical condition and changes its electrical characteristics, such as resistance.

7.4.2Light sensor Level sensor Proximity sensor Temperature sensor

7.4.3The overload sensor will continuously (analogous\ change its characteristic resistance as the load on it is altered or changed. (Not in a stepped digital format\ OR When connected to the analogue input on a PLC, parameters can be

7.5NOTE: O/L and Stop must both be in the same condition (either open or closed\ (10\ OR

7.6.1DC to AC Inverter. (1\

7.6.2Insulated Gate Bipolar Transistor (IGBT\ Metal Oxide Semi Conductor Field Effect Transistor ( MOSFET (1\

7.6.3Improves energy usage Reduces motor wear Achieves variable motor speed control (2\

7.6.4Vector drives use a mathematical model of the drive in software . B measuring the current vectors in relation to the applied voltage

7.7When the momentum of a load drives the motor, the motor changes into a generator converting

7.8Br aking Resistor. (1\ 0] TOTAL 200

Mathematical Content

trig

Topics Identified

CircuitsMachines

Mark Allocation

Total200 marks

Sections10 + 35 + 30 = 75 marks

Paper information

SubjectElectrical Technology

Year2021

SessionNovember

TypeMemo

PaperPaper 1

LanguageEnglish

Pages15

Downloads4

Examination context

Decade2020s

Years ago5y

SeasonSpring (SH)

Start dayFriday

Exam periodNovember 2021

Days since exam1,817

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