Electrical Technology Memo 1 (English)

Feb-March 2012 — Grade 12 / Matric — Electrical Technology

Memo 2012 Grade 12 English

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🎯 200 marks 📄 13 pages 📝 81 items found ∑ 1 math symbols 📚 2 topics

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2.5Substitution of values must be done correctly. answer is obtained. marks for subsequent calculations.

2.1All calculations must show the formula(e\ All answers must contain the correct unit to be considered. Alternative methods must be cons idered, provided that the same Where an erroneous answer could be ca

Q1— Section header —

1.1It is not ethical because the person' s life and that of fe llow workers will be In relation to safety measures he and his supervisor may be held

1.2It is important to do market research for the following reasons: Need to find a market for if the product is to be a success financially it has to be sold at a profit. The product must be cost effective to make

1.3Hydro energy (Any three\

Q2— Section header —

2.1Identify the problem and inve Design possible solutions. Communicate/present the process in fact in accordance to th

2.2The artefact/project ca n be realised reducing problems. The artefact/project can be achieved within timeframes. Costing within budget allocation as planning is done. Functionality of project according to design process.

2.3Track layout is crucial to ensure that the board is electrically sound. tracks must not touch, must be the co rrect width, must not peel from the The component layout is important to ensure correct operation,

Q4— Section header —

4.34.3.1 PL PL PL

Q3— Section header —

3.1Water is an electrical conductor. If water is used in fighting an electrical (2\

3.2The type work that wil l be done in an electrical technology workshop requires the correct lighting le vel because good visual sight is crucial in and other electrical work. (2\

3.3Direct contact with the following. (Any two\ (2\

3.4When using an electrical appliance that has a co nducting material under faulty conditions, the user may be shocked. With the earth leakage unit any earth fault above 20 mA will immediat ely activate the unit, isolating the

3.5Safety goggles (1\

3.6To prevent accidents Ensure correct operation ny one relevant answer\ (1\

Q4— Section header —

4.2To be able to supply c h single-phase and three-phase kW

Q5— Section header —

5.1The brightness will increase. (1\

5.2It decreases the efficiency of both the supply system and equipment A higher current is drawn to deliver

5.35.3.1

5.45.4.1

5.4.4Rotation anti clockwise. ction of rotation, deduct one mark.

Q6— Section header —

6.1gate and the SCR will be triggered into conduction. OR The anode must be connected

6.2The anode must be c onnected to the positive and the cathode connected to the negative. A positive pulse must now be applied to the to the positive and the cathode connected to the negative. If this voltage

6.36.3.1 At reverse breakdown vo begin to conduct there will be a large flow of current which will lead to the destruction of the component. (3\

6.3.2There will be a forward voltage V The voltage will be very low. (1\

6.3.3When the SCR is conducting a cu rrent will flow through it that is (2\

6.3.4If the current drops below I the SCR will stop conducting; it will turn off. (2\

6.46.4.1 1. TRIAC (2\

6.4.2By adjusting R (t=RC\g R the time constant is reduced The time it take s to charge up the capacitor (C\V DIAC he DIAC causing it to conduct

6.4.3The function of R is to limit the current in the event that R is set to 0 rrent-limiting device. (2\

6.5Thyristor control has far less (1\

7.1INPUT OUTPUT If V = negative ( -V cc

Q7— Section header —

7.3It is a set of rules in terms of which the output reacts The op-amp amplifies the difference between the input signals. It operates

7.47.4.1 Inverting op-amp (1\

7.4.3Voltage across R this will decrease the feedback the non-inverting input

7.4.4connect the input

7.4.5The 0 V rail (1\

7.5A voltage amplifier (1\ under most practical and non inverting inputs

7.67.6.1 Stable conditions (2\

7.6.2Two inputs, inverting (2\

Q8— Section header —

8.1Copper losses

8.2Connected in delta. Only three conductors needed for transmission not four. There is a huge saving in cost in cables and infrastructure.

8.3To reduce eddy currents circulating in the core this causes heat to be

8.4Given: N = 800 = 60 = 8 kV

8.4.1PHLVV3 VVVVPHLPH8.4618380003 (3\

8.5No. to the secondary of the transformer, in this transformation process losses occurs in the transformer The output power is always less than the input power due to losses.

Q9— Section header —

9.19.1.1 Push buttons

9.1.2Indicator lamps Solenoid valves (Any two\

9.29.2.1 Normally open switch (1\

9.2.2Normally closed switch (1\

9.2.3Relay, solenoid, coil (Any one\ (1\

9.39.3.1 AND gate (1\

9.3.2AND GATE SYMBOL One mark for the Input and output l abels. One mark for the correct

9.3.3and timers and subtractors denoted by [ C ]

9.5CONTROL CIRCUIT

9.49.4.1 Real-time clocks denoted by [ T ] (3\

9.4.2Adders (3\ DIAGRAM OF A STARTER

9.69.6.1 For a control panel with more than ten relays, a programmable controller is cheaper.

9.6.2Installation time is reduced owing to fewer components, flexible

9.6.3Fewer components are subject to wear and units have built-in diagnostics functions.

9.7PLCs are used to automate machinery in assembly lines and were developed as a substitute for large relay-based panels. Traffic lights wer that relates to automation.

10.210.2.1

Q10— Section header —

10.1

10.3Control circuit wiring may be incorrectly wired. Motor circuit wiring may be incorrectly wired. Protective equipment may be faulty. (3\

10.4The motor frame must be earthed For the answer to receive full mar ks it must contain a statement and a motivation. (2\

10.5

10.6An AC supply is connected to the stator winding, which sets up currents in Due to the phase difference of the current s a rotating magnetic field is set up The rotating magnetic field sweeps across the rotor conductors, cutting the

10.7The no-volt coil prevents the circuit from switching on (2\

10.8Interlocking contact is necessary to prevent both t he star and delta closing at the same time, causing a direct short circuit. (2\

10.9By changing around/ swapping any two of the phases of the supply to the (1\

Mathematical Content

trig

Topics Identified

CircuitsMachines

Mark Allocation

Total200 marks

Sections10 + 10 + 10 + 10 + 10 + 30 + 25 + 25 + 15 + 35 + 30 = 210 marks

Per-question sum132 marks

Paper information

SubjectElectrical Technology

Year2012

SessionFeb-March

TypeMemo

PaperPaper 1

LanguageEnglish

Pages13

Downloads4

Examination context

Decade2010s

Years ago14y

Season—

Start day—

Exam period—

Days since exam—

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