Electrical Technology Paper 1 (English)

Feb-March 2016 — Grade 12 / Matric — Electrical Technology

Past Paper 2016 Grade 12 English

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🎯 200 marks ⏱️ 3h 📄 13 pages 📝 68 items found ∑ 1 math symbols 📚 2 topics

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Q1— Section header —

1.1Name ONE unsafe condition that may result in an injury in an electrical technology workshop. (1\

1.2Define the term unsafe action with reference to an electrical technology workshop (2\

1.3State FOUR steps in order of priority, that must be adhered to when helping a person who is a victim of an electrical shock in an electrical technology

1.4Briefly explain why productivity is considered an important work ethic in the South Africa n industrial context (3\ [10

Q2— Section header —

2.1Name the instrument that is used to measure electrical energy (1\

2.2State TWO advantages of three phase systems over single phase systems

2.3Draw a neat ly labelled sketch representin g the voltage waveforms of a three phase AC generat

2.4A three phase star connected balanced load is supplied by a three phase

2.4.1 ine voltage (3\

2.4.2 hase voltage (3\ Electrical Technology DBE/Feb. Mar. 2016 NSC

2.5In a three phase supply system the two wattmeter method was used to measure the input power to an inductive load which has a power factor of 0, 8. The values indicated on the instruments are 8 kW and 4 kW respectively.

2.5.2 ine cu rrent (3\ [2

Q3— Section header —

3.1State how eddy currents may be limited in the iron core of a transformer. (1\

3.2Name TWO similarities between a single phase transformer and a three

3.3State TWO factors that may cause excessive heating in a transformer. (2\

3.4Name TWO applications of a delta star connected distribution network transformer.

3.5Explain the function of transformer in a distribution netwo rk. (3\

3.6Refer to FIGURE 3.1 and answer the questions that follow FIGURE 3.1: THREE PHASE TRANSFORMER Given

4.6Calculate the number of pole pairs of a three phase motor if the motor is connected t o a 50 Hz supply and has a synchronous speed of 600 r /min. iven:

4.7A three phase delta connected motor is connected to a 380 V/50 Hz supply. The motor draws a current of 16 A at full oad. It has a po wer factor of 0,

4.7.1Input kVA (3\

4.7.2Power developed by the motor at 100% efficiency (3\

4.7.3The actual output power of the motor (3\ [40]40

Q5— Section header —

5.1Name the TWO factor that influence the reactance of a capacitor (2

5.2Distinguish between the two concepts reactance and impedance (2

5.3Draw the typi cal frequency/impedance characteristic curve of a series RLC circuit. The graph must show the rel ationship between impedance and frequency as

5.4Calculate the Q factor of a series RLC circuit that resonates at 6 kHz. The coil and the capacitor each have a reactance at resonance

5.5Refer to the circuit diagram in FIGURE 5.1 FIGURE 5.1: SERIES RLC CIRCUIT iven

5.5.1nductive reactance of the c oil (3\

5.5.2apacitive reactance of the c apacitor (3\

5.5.3requency at which the circuit will resonate (3\ [20]20

Q6— Section header —

6.1State TWO advantages of rogrammable ogic

6.2Draw a block diagram of a PLC scan cycle showing the THR EE steps that are used to execute a programme Label each step and indicate its function.

6.6.1Convert the equation into a Karnaugh map (Remember to group.\ (6\

6.6.2Derive and write the simplified Boolean equation from the Kar naugh map in your ANSWER BOOK. (3\ 6. Refer to the circuit diagram in FIGURE 6.1 and answer the questions

6.1(2\ 6. .2 Draw the PLC ladder logic diagram

6.1. Your diagram must incl ude a marker or flag function (8\ 6.

6.7.2(3\ [40] Hold in MC (N/O\40

Q7— Section header —

7.1Name TWO characteristics of an ideal mp. (2\

7.2Describe the term ban dwidth (3\

7.3Describe the term positive feedback (3\

7.4Draw and label the circuit symbol of an op a mp. Include the power terminals. (6\

7.5With reference to the ideal mp circuits below, draw the given input and output wave

7.5.1FIGURE 7.1 IDEAL OP AMP CIRCUIT (3\

7.5.2FIGURE 7.2 IDEAL OP AMP CIRCUIT (3\

7.6State TWO advantages of using negative feedback in an mp circuit. (2\

7.7efer to FIGURE 7.3 and answer the questions that follow. FIGURE 7.3 OP

7.7.1Identify the mp configuration (1\

7.7.2raw the input and output signal on the same axi s. Label the

7.7.3Calculate the voltage gain (3\

7.7.4Calculate the output voltage if an input signal of 2,5 V is applied to the mp (3\

7.8Name TWO appl ications of an astable multi vibrator circuit. (2\

7.9With reference to FIGURE

7.4, draw the input wave form shown in FIGURE

7.5and the output wave form directly below it FIGURE 7.4: BI STABLE MULTIVIBRATOR FIGURE 7.5: INPUT WAVE FORM FOR THE

7.10With reference to FIGURE 7.6 answer the questions that follow.

7.10.1Identify the type of feedback used in the RC phase shift oscillator. (1\

7.10.2State ONE application of the oscillator (1\

7.10.3Calculate the oscillation frequency for an RC phase shift oscillator that use three RC networks. T he resistors are all 15 capacitors are all 150 nF

7.11With reference to FIGURE 7.7 answer the questions that follow.

7.11.1State ONE application of the integrator circuit (1\

7.11.2Draw the input and output wave forms of the mp ntegrator

Mathematical Content

trig

Topics Identified

CircuitsMachines

Mark Allocation

Total200 marks

Sections40 + 20 + 40 + 50 = 150 marks

Paper information

SubjectElectrical Technology

Year2016

SessionFeb-March

TypePast Paper

PaperPaper 1

LanguageEnglish

Pages13

Downloads6

Examination context

Decade2010s

Years ago10y

Season—

Start day—

Exam period—

Days since exam—

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