Electrical Technology Electronics Memo 1 (English)

May-June 2022 — Grade 12 / Matric — Electrical Technology

Memo 2022 Grade 12 English

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🎯 200 marks 📄 14 pages 📝 89 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

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\

1.13(1\

1.14(1\

1.15(1\ [1 Ele ctrical Te ch

2.1Machinery means any article or combination of articles assembled, arranged or connected and which is used or intended to be used for converting any form of energy to performing work. (2\

2.2Critical incident is an event that causes a grave or severe physical injury to a person , threatening their safety. (2\

2.3Sound the alarm system immediately. Use the correct fire extinguisher if you were trained to If there is a telephone nearby in a safe location, call your school secretary or principal to let them know of the situation.

2.4Due to the pandemic the mask protects oneself and others from viral infections Not using a mask will be an unsafe act because you are creating

2.5Make use of a chemical waste company to remove or to dispose of chemicals. Waste chemicals should NEVER be poured into toilets or down the drain as they can be harmful to the environment and the local sewerage

3.1A phasor diagram is a graphical representation of a sinusoidal alternating current or voltage in an RLC circuit

3.2.1= 174,93 V (3\

3.2.2Lagging. The circuit is inductive because the in uctive voltage (V \is greater than the capacitive voltage (V

3.3.1(3\

3.3.2(3\

3.3.3NOTE: , I and the angle is con idered the primary marks. If the

3.3.4The circuit is inductive because the inductive current is greater than the capacitive current. (2\ 4,47 4\ (6

3.4.1At resonance X = X (3\

3.4.2(3\

3.4.3(3\

3.4.4electivity is a measure of how well a resonant circuit responds to a range of frequencies and excludes others. (2\

3.5.1Capacitor the current leads the voltage by 90

3.5.2Pure resistor The voltage and current are in phase. (2\ [35] 14,67 150 220035

4.1.1380 V to 4 15 (1\

4.1.2red yellow / white

4.1.3(5\

4.2Generation Power station Transmission Distribution to consumers (3\

4.3.1Line voltage is measured between any two lines (L , L

4.3.2Phase voltage is m easured between any of the lines and neutral. (L N, L

4.4Reactive power is the power needed in an AC system (transformer or motor\ to set up and maintain the magnetic field of that system (transformer o motor\ The following answer is provided in the textbook and will be accepted.

4.5.1(3\

4.5.2(3\

4.5.3(3\

4.5.4(3\

4.6.1(a\ Coil 1 current coil (b\ Coil 2 voltage coil

4.6.2It can be used on balanced and unbalanced loads. It can be used on star or delta systems. The power factor can also be determined. (2\

4.6.3(3\ The following formula and method is used in the textbook and will also be accepted = W +W

5.1Core type Shell type (2\

5.2Dielectric oil is a non conductor of electricity and provides electrical insulation between the case and the windings. It provides cooling to the transformer. (2\

5.3The Buchholz relay is placed in line between the conservator and the transformer housing. (2\

5.4NOTE: 1 mark for each delta connection on the primary side 1 mark for the common neutral connection on the secondary side 1 mark for indicating the three supply lines on the primary side 1 m ark for indicating the three load lines on the secondary side

5.5.1(3\

5.5.2

5.6.1(3\

5.6.2(3\

5.6.3For Delta V = V ph = 6 000 V (2\

5.6.4therefore (3\ [30] Ele ctrical Te ch nolog y: Power Systems30

6.1Continuity test between the ends of each coil Continuity test between the frame of the motor and earth (2\

6.2Cogging is the tendency of rotor rod to remain stuck under a stator tooth due to the direct magnetic attraction between the two. (2\

6.3Less maintenance because of the absence of slip rings and brushes. xplosion proof because of the absence of brushes and slip rings that cause sparking (2\

6.4Cranes Conveyor belts (2\

6.5Pull up torque Breakdown torque

6.7.2(3\

6.8.1Iron losses Mechanical losses (2\

6.8.2(3\ Ele ctrical Te ch nolog y: Power Systems 12 DBE/2022

6.8.3(3\

6.9.1Timer (1\

6.9.2Each overload unit monitors the current drawn by each motor independently. (2\

6.9.3The MC N/O auxiliary contact (Hold contact\ connected in parallel with the start button is omitted. (1\

6.9.4The moment the start button is released MC will de energise, opening MC N/O

7.1The function of the central processing unit is to execute the instructions as per the inputs and provide the outputs.

7.2Reduced cost Reduced space Flexibility Simplicity. (1\

7.3.1The purpose of the timer function is to activate or deactivate a device after or before a pre set interval of time.

7.3.2An ON delay timer s contact would not operate until a pre set delay time has passed, after it has first been energised in the logic sequence.

7.4.1Temperature sensor Proximity sensor Level sensor oad sensor Ultrasonic sensor Pressure sensor (2\

7.4.2Light sensor is applied in: Lighting systems controlled by a PLC A sprinkler system controlled by a PLC to nly operate at night Phot

7.5NOTE: 1 mark for indicating the power rail or power supply mark for each correctly labelled symbol provided it makes logic sense towards the operation of the circuit. (6\

7.6.1Regenerative energy is energy recovered from the motor when it slows down by converting mechanical energy to electrical energy which can be either used immediately or stored until needed. (3\

7.6.2Regenerative braking methods may be used in: Lifts Cranes Electrical locomotives or trains Battery powered electrical vehicle 7.

7.7.1AC to DC converter (rectifier\ Filter

7.7.2Limit start up current. Improvements in productivity. Improves energy usage by controlling the power that is fed into the motor. Reduce motor wear. Better process control, such as speeding up or slowing down a

7.8.1Phase 1 and Phase 2

7.8.2The frequency to the motor is controlled by an AC controller that switches the IGBT s on and off at a certain frequency. OR The frequency of the motor is controlled by an AC controller that controls the tempo of switching the phases.

7.8.3An AC controller switches S and S on and off at a certain frequency to create a train of positive pulses that imitates the positive half cycle for phase 1.

Mathematical Content

trig

Topics Identified

CircuitsMachines

Mark Allocation

Total200 marks

Sections10 + 35 + 35 + 30 + 35 + 40 = 185 marks

Paper information

SubjectElectrical Technology

Year2022

SessionMay-June

TypeMemo

PaperPaper 1

LanguageEnglish

Pages14

Downloads7

Examination context

Decade2020s

Years ago4y

Season—

Start day—

Exam period—

Days since exam—

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