Electrical Technology Grade 12 Term 2 June Past Papers and Memos

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 State whether it is an unsafe act or a condition when a person neglects to wear 10 marks
3. Q3 Switching Circuits3.1 Explain the term dual voltage supply with reference to operational amplifiers. (2) 50 marks
4. Q4 Semiconductor Devices4.1 Explain common-mode rejection ratio with reference to a 741 op amp. (2) 20 marks
5. Q5 Digital and Sequential Devices5.1 State TWO common connections for illuminating the LEDs in the seven- 55 marks
6. Q6 Microcontrollers6.1 Explain how microprocessors provide digital processing of data to devices. (5) 50 marks

Instructions to candidates

1. This question paper consists of SIX questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 3.3.3, 3.5.2, 3.6.2 and 3.8.2 QUESTIONS 5.4.1, 5.4.2, 5.5.2, 5.5.3, 5.7 and 5.10 QUESTIONS 6.8
4. Write your centre number and examination number on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and FULLY LABELLED.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Calculations must include: 9.1 Formulae and manipulations where needed 9.2 Correct replacement of values 9.3 Correct answer and relevant units where applicable
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Digital Electronics 3 DBE/May/June 2026 SC/NSC Confidential

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 State whether it is an unsafe act or a condition when a person neglects to wear 10 marks
3. Q3 Rlc Circuits3.1 Explain the following with reference to RLC circuits: 35 marks
4. Q4 Semiconductor Devices4.1 Identify the symbol of the transistor in FIGURE 4.1 below. 45 marks
5. Q5 Switching Circuits5.1 Explain the term dual voltage supply with reference to operational amplifiers. (2) 50 marks
6. Q6 Amplifiers6.1 Name ONE broad category of transistor amplifiers. (1) 45 marks

Instructions to candidates

1. This question paper consists of SIX questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 4.5.2 and 4.6.2 QUESTIONS 5.3.3, 5.5.2, 5.6.2 and 5.8.2 QUESTIONS 6.2.3 and 6.8.3
4. Write your centre number and examination number on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and FULLY LABELLED.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Calculations MUST include: 9.1 Formulae and manipulations where needed 9.2 Correct replacement of values 9.3 Correct answer and relevant units where applicable
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Electronics 3 DBE/May/June 2026 SC/NSC Confidential

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 State whether it is an unsafe act or a condition when a person neglects to wear 10 marks
3. Q3 Rlc Circuits3.1 Explain the following with reference to RLC circuits: 35 marks
4. Q4 Three-Phase Ac Generation4.1 Name TWO environmentally friendly methods of power generation in 35 marks
5. Q5 Three-Phase Transformers5.1 Describe the term transformation with reference to transformers. (2) 30 marks
6. Q6 Three-Phase Motors and Starters6.1 Explain the concept induction with reference to three-phase induction motors. (3) 35 marks
7. Q7 Programmable Logic Controllers (Plcs)7.1 State TWO disadvantages of a relay control system in comparison with 40 marks

Instructions to candidates

1. This question paper consists of SEVEN questions.
2. Answer ALL the questions.
3. Sketches and diagrams must be large, neat and FULLY LABELLED.
4. Show ALL calculations and round off answers correctly to TWO decimal places.
5. Number the answers correctly according to the numbering system used in this question paper.
6. You may use a non-programmable calculator.
7. Calculations MUST include: 7.1 Formulae and manipulations where needed 7.2 Correct replacement of values 7.3 Correct answer and relevant units where applicable
8. A formula sheet is attached at the end of this question paper.
9. Write neatly and legibly. Electrical Technology: Power Systems 3 DBE/May/June 2026 SC/NSC Confidential

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 State TWO unsafe acts that would be regarded as dangerous practices by a 10 marks
3. Q3 Switching Circuits3.1 State ONE effect of switch bounce in electronic circuits. (1) 50 marks
4. Q4 Semiconductor Devices4.1 Determine the output state of the op amp in FIGURE 4.1 below for the 20 marks
5. Q5 Digital and Sequential Devices5.1 Explain polarisation when used in the operation of a liquid crystal display 55 marks
6. Q6 Microcontrollers6.1 State TWO uses of a microcontroller as used in commercial devices. (2) 50 marks

Instructions to candidates

1. This question paper consists of SIX questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 3.3.3, 3.5.3 and 3.7.1 QUESTIONS 5.3, 5.4, 5.6, 5.7.1, 5.7.2, 5.8.1 and 5.10 QUESTIONS 6.9.2
4. Write your centre number and examination number on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and FULLY LABELLED.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Calculations must include: 9.1 Formulae and manipulations where needed 9.2 Correct replacement of values 9.3 Correct answer and relevant units where applicable
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Digital Electronics 3 DBE/May/June 2024 SC/NSC Confidential

1. Q1 Multiple-Choice Questions 15 marks
2. Q2 Occupational Health and Safety 10 marks
3. Q3 Rlc Circuits 35 marks
4. Q4 Semiconductor Devices 45 marks
5. Q5 Switching Circuits 50 marks
6. Q6 Amplifiers 45 marks

Instructions to candidates

1. All questions with multiple answers imply that any relevant, acceptable answer should be considered.
2. Calculations: 2.1 All calculations must show the formulae. 2.2 Substitution of values must be done correctly. 2.3 All answers MUST contain the correct unit to be considered. 2.4 Alternative methods must be considered, provided that the correct answer is obtain
3. This memorandum is only a guide with model answers. Alternative interpretations must be considered and marked on merit. However, this principle should be applied consistently throughout the marking session at ALL marking centres. Electrical Technology: Electro

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 State TWO unsafe acts that would be regarded as dangerous practices by a 10 marks
3. Q3 Rlc Circuits3.1 Explain the term reactance with reference to an alternating current circuit. (2) 35 marks
4. Q4 Three-Phase Ac Generation4.1 FIGURE 4.1 below shows a block diagram of the national power grid in 35 marks
5. Q5 Three-Phase Transformers5.1 Refer to FIGURE 5.1 below and answer the questions that follow. 30 marks
6. Q6 Three-Phase Motors and Starters6.1 Name TWO rotating parts of a three-phase induction motor. (2) 35 marks
7. Q7 Programmable Logic Controllers (Plcs)7.1 State THREE advantages of hard wiring. (3) 40 marks

Instructions to candidates

1. This question paper consists of SEVEN questions.
2. Answer ALL the questions.
3. Sketches and diagrams must be large, neat and FULLY LABELLED.
4. Show ALL calculations and round off answers correctly to TWO decimal places.
5. Number the answers correctly according to the numbering system used in this question paper.
6. You may use a non-programmable calculator.
7. Calculations must include: 7.1 Formulae and manipulations where needed 7.2 Correct replacement of values 7.3 Correct answer and relevant units where applicable
8. A formula sheet is attached at the end of this question paper.
9. Write neatly and legibly. Electrical Technology: Power Systems 3 DBE/May/June 2024 SC/NSC Confidential

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 State the purpose of the Occupational Health and Safety Act, 1993 10 marks
3. Q3 Switching Circuits3.1 FIGURE 3.1 below shows block diagrams with different input and output 50 marks
4. Q4 Semiconductor Devices4.1 FIGURE 4.1 below shows two identical signals on the input terminals of an op 20 marks
5. Q5 Digital and Sequential Devices5.1 Refer to an LED seven-segment display and answer the questions that follow. 55 marks
6. Q6 Microcontrollers6.1 Explain how microprocessors provide digital processing control to appliances. (5) 50 marks

Instructions to candidates

1. This question paper consists of SIX questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 3.3.6, 3.4.3 and 3.6.1 QUESTIONS 5.2.1, 5.2.2, 5.4.1, 5.4.3, 5.6.2 and 5.7 QUESTION 6.9
4. Write your centre number and examination number on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and FULLY LABELLED.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Calculations must include: 9.1 Formulae and manipulations where needed 9.2 Correct replacement of values 9.3 Correct answer and relevant units where applicable
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Digital Electronics 3 DBE/2023 SC/NSC

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 State the purpose of the Occupational Health and Safety Act, 1993 (Act 85 of 10 marks
3. Q3 Rlc Circuits3.1 Describe what is meant by the term in phase with reference to the relationship 35 marks
4. Q4 Semiconductor Devices4.1 Identify the semiconductor device symbols in QUESTIONS 4.1.1 and 4.1.2 45 marks
5. Q5 Switching Circuits5.1 FIGURE 5.1 below shows block diagrams with different input and output 50 marks
6. Q6 Amplifiers6.1 Define the term stability with reference to the Q-point of amplifiers. (2) 45 marks

Instructions to candidates

1. This question paper consists of SIX questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 4.4.3 and 4.5.3 QUESTIONS 5.3.6, 5.4.3 and 5.6.1 QUESTIONS 6.2.2, 6.6.3 and 6.8.3
4. Write your centre number and examination number on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and FULLY LABELLED.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Calculations must include: 9.1 Formulae and manipulations where needed 9.2 Correct replacement of values 9.3 Correct answer and relevant units where applicable
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Electronics 3 DBE/2023 SC/NSC

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 State the purpose of the Occupational Health and Safety Act, 1993 (Act 85 10 marks
3. Q3 Rlc Circuits3.1 Describe what is meant by the term in phase with reference to the relationship 35 marks
4. Q4 Three-Phase Ac Generation4.1 Refer to FIGURE 4.1 below and answer the questions that follow. 35 marks
5. Q5 Three-Phase Transformers5.1 Name the process used by transformers to transfer energy from the primary 30 marks
6. Q6 Three-Phase Motors and Starters6.1 Name THREE parts of a cage rotor. (3) 35 marks
7. Q7 Programmable Logic Controllers (Plcs)7.1 State TWO disadvantages of a relay control system in comparison with PLC 40 marks

Instructions to candidates

1. This question paper consists of SEVEN questions.
2. Answer ALL the questions.
3. Sketches and diagrams must be large, neat and FULLY LABELLED.
4. Show ALL calculations and round off answers correctly to TWO decimal places.
5. Number the answers correctly according to the numbering system used in this question paper.
6. You may use a non-programmable calculator.
7. Calculations must include: 7.1 Formulae and manipulations where needed 7.2 Correct replacement of values 7.3 Correct answer and relevant units where applicable
8. A formula sheet is attached at the end of this question paper.
9. Write neatly and legibly. Electrical Technology: Power Systems 3 DBE/2023 SC/NSC

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 Explain the term machinery with reference to the Occupational Health and 10 marks
3. Q3 Switching Circuits3.1 Name the type of multivibrator that: 50 marks
4. Q4 Semiconductor Devices4.1 FIGURE 4.1 below shows the 555 IC. Answer the questions that follow. 20 marks
5. Q5 Digital and Sequential Devices5.1 Answer the following questions with reference to the seven-segment 55 marks
6. Q6 Microcontrollers6.1 Name TWO uses of a microcontroller in industrial control devices. (2) 50 marks

Instructions to candidates

1. This question paper consists of SIX questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 3.3.5, 3.4.6, 3.6.1 and 3.6.2 QUESTION 4.2.3 QUESTIONS 5.3.1, 5.4.1, 5.4.2, 5.5, 5.6.1 and 5.8 QUESTION 6.11
4. Write your centre number and examination number on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and FULLY LABELLED.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Calculations must include: 9.1 Formulae and manipulations where needed 9.2 Correct replacement of values 9.3 Correct answer and relevant units where applicable
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Digital Electronics 3 DBE/2022 SC/NSC

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 Explain the term machinery with reference to the Occupational Health and 10 marks
3. Q3 Rlc Circuits3.1 Define a phasor diagram with reference to RLC circuits connected across an 35 marks
4. Q4 Semiconductors4.1 Draw a fully labelled IEC symbol of a unijunction transistor. (3) 45 marks
5. Q5 Switching Circuits5.1 Name the type of multivibrator that: 50 marks
6. Q6 Amplifiers6.1 Describe the term linear amplifier with reference to amplifiers. (2) 45 marks

Instructions to candidates

1. This question paper consists of SIX questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 4.2.1, 4.2.2, 4.3.3 and 4.7.3 QUESTIONS 5.3.5, 5.4.6, 5.6.1 and 5.6.2 QUESTION 6.5.3
4. Write your centre number and examination number on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and FULLY LABELLED.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Calculations must include: 9.1 Formulae and manipulations where needed 9.2 Correct replacement of values 9.3 Correct answers and relevant units where applicable
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Electronics 3 DBE/2022 SC/NSC

1. Q1 Multiple-Choice QuestionsVarious options are provided as possible answers to the following questions. Choose 15 marks
2. Q2 Occupational Health and Safety2.1 Explain the term machinery with reference to the Occupational Health and 10 marks
3. Q3 Rlc Circuits3.1 Define phasor diagram with reference to RLC circuits connected across an 35 marks
4. Q4 Three-Phase Ac Generation4.1 Refer to FIGURE 4.1 below and answer the questions that follow. 35 marks
5. Q5 Three-Phase Transformers5.1 Name TWO types of transformer core constructions used in three-phase 30 marks
6. Q6 Three-Phase Motors and Starters6.1 Name TWO continuity tests to be performed on a three-phase motor. (2) 35 marks
7. Q7 Programmable Logic Controllers (Plcs)7.1 Explain the function of the central processing unit (CPU) with reference to the 40 marks

Instructions to candidates

1. This question paper consists of SEVEN questions.
2. Answer ALL the questions.
3. Sketches and diagrams must be large, neat and FULLY LABELLED.
4. Show ALL calculations and round off answers correctly to TWO decimal places.
5. Number the answers correctly according to the numbering system used in this question paper.
6. You may use a non-programmable calculator.
7. Calculations must include: 7.1 Formulae and manipulations where needed 7.2 Correct replacement of values 7.3 Correct answers and relevant units where applicable
8. A formula sheet is attached at the end of this question paper.
9. Write neatly and legibly. Electrical Technology: Power Systems 3 DBE/2022 SC/NSC

1. Q1 Occupational Health and Safety1.1 Define the term safe with reference to the Occupational Health and Safety 10 marks
2. Q2 Switching Circuits2.1 Refer to FIGURE 2.1 below and answer the questions that follow. 60 marks
3. Q3 Semiconductor Devices3.1 Name FOUR characteristics of an ideal operational amplifier. (4) 20 marks
4. Q4 Digital and Sequential Devices4.1 Name TWO methods to display information in digital systems. (2) 55 marks
5. Q5 Microcontrollers5.1 Refer to the block diagram in FIGURE 5.1 below and answer the questions 55 marks

Instructions to candidates

1. This question paper consists of FIVE questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 2.2.4, 2.7.1 and 2.7.2 QUESTIONS 4.5.2, 4.6, 4.7, 4.8, 4.9 and 4.12.2 QUESTION 5.9
4. Write your CENTRE NUMBER and EXAMINATION NUMBER on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and FULLY LABELLED.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Calculations must include: 9.1. Formulae and manipulations where needed 9.2 Correct replacement of values 9.3 Correct answer and relevant units where applicable
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Digital Electronics 3 DBE/2021 SC/NSC

1. Q1 Occupational Health and Safety1.1 Define the term safe with reference to the Occupational Health and Safety 10 marks
2. Q2 Rlc Circuits2.1 Define the following terms with reference to RLC circuits: 40 marks
3. Q3 Semiconductor Devices3.1 Name ONE type of field-effect transistor (FET). (1) 30 marks
4. Q4 Switching Circuits4.1 Refer to FIGURE 4.1 below and answer the questions that follow. 60 marks
5. Q5 Amplifiers5.1 Define the following terms with reference to amplifier circuits: 60 marks

Instructions to candidates

1. This question paper consists of FIVE questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 4.2.4, 4.7.1 and 4.7.2 QUESTIONS 5.9.3 and 5.10.6
4. Write your CENTRE NUMBER and EXAMINATION NUMBER on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and FULLY LABELLED.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Calculations must include: 9.1. Formulae and manipulations where needed 9.2 Correct replacement of values 9.3 Correct answers and relevant units where applicable
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Electronics 3 DBE/2021 SC/NSC

1. Q1 Occupational Health and Safety1.1 Define the term safe with reference to the Occupational Health and Safety 10 marks
2. Q2 Rlc Circuits2.1 Define the following terms with reference to RLC circuits: 40 marks
3. Q3 Three-Phase Ac Generation3.1 Explain the following terms: 30 marks
4. Q4 Three-Phase Transformers4.1 Name TWO cooling methods used in a dry transformer. (2) 30 marks
5. Q5 Three-Phase Motors and Starters5.1 FIGURE 5.1 below shows the rotor of an induction motor. Answer the 30 marks
6. Q6 Programmable Logic Controllers (Plcs)6.1 Draw a fully labelled diagram of a PLC scan cycle. (3) 60 marks

Instructions to candidates

1. This question paper consists of SIX questions.
2. Answer ALL the questions.
3. Sketches and diagrams must be large, neat and FULLY LABELLED.
4. Show ALL calculations and round off answers correctly to TWO decimal places.
5. Number the answers correctly according to the numbering system used in this question paper.
6. You may use a non-programmable calculator.
7. Calculations must include: 7.1 Formulae and manipulations where needed 7.2 Correct replacement of values 7.3 Correct answers and relevant units where applicable
8. A formula sheet is attached at the end of this question paper.
9. Write neatly and legibly. Electrical Technology: Power Systems 3 DBE/2021 SC/NSC

1. Q1 Occupational Health and Safety (Generic)1.1 Define the term accident with reference to the Occupational Health and Safety 10 marks
2. Q2 Switching Circuits (Generic)2.1 Explain the term bistable with reference to multivibrators. (1) 60 marks
3. Q3 Semiconductor Devices (Specific)3.1 FIGURE 3.1 below shows two signals with the same frequency and amplitude 20 marks
4. Q4 Digital and Sequential Devices (Specific)4.1 Explain the term polarisation as used in the operation of a liquid crystal 55 marks
5. Q5 Microcontrollers (Specific)5.1 State TWO uses of a microcontroller in industrial control devices. (2) 55 marks

Instructions to candidates

1. This question paper consists of FIVE questions.
2. Answer ALL the questions.
3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 2.2.1, 2.4.2, 2.4.4, 2.5.2, 2.6.3 and 2.8.2 QUESTIONS 4.3.1, 4.3.2, 4.4, 4.5 and 4.7
4. Write your CENTRE NUMBER and EXAMINATION NUMBER on every ANSWER SHEET and hand them in with your ANSWER BOOK, whether you have used them or not.
5. Sketches and diagrams must be large, neat and fully labelled.
6. Show ALL calculations and round off answers correctly to TWO decimal places.
7. Number the answers correctly according to the numbering system used in this question paper.
8. You may use a non-programmable calculator.
9. Show the units for ALL answers and calculations.
10. A formula sheet is attached at the end of this question paper.
11. Write neatly and legibly. Electrical Technology: Digital 3 DBE/2019 SC/NSC

1. Q1 Occupational Health and Safety (Generic)1.1 Define the term accident with reference to the Occupational Health and Safety 10 marks
2. Q2 Rlc Circuits (Generic)2.1 Define the following terms: 40 marks
3. Q3 Semiconductor Devices (Specific)3.1 Name TWO types of MOSFET. (2) 30 marks
4. Q4 Switching Circuits (Generic)4.1 Explain the term bistable with reference to multivibrators. (1) 60 marks
5. Q5 Amplifiers (Specific)5.1 Explain why transistor amplifiers use a small signal stage at the input. (2) 60 marks

1. Q1 Occupational Health and Safety (Generic)1.1 Define the term accident with reference to the Occupational Health and 10 marks
2. Q2 Rlc Circuits (Generic)2.1 Define the following terms: 40 marks
3. Q3 Three-Phase Ac Generation (Specific)3.1 State the functions of the following meters: 30 marks
4. Q4 Three-Phase Transformers (Specific)4.1 Refer to the losses that occur in transformers and answer the questions 30 marks
5. Q5 Three-Phase Motors and Starters (Specific)5.1 Define the term synchronous speed of the motor. (2) 30 marks
6. Q6 Programmable Logic Controllers (Plcs) (Specific)6.1 State THREE disadvantages of a relay control system in comparison to 60 marks

Instructions to candidates

1. This question paper consists of SIX questions.
2. Answer ALL the questions.
3. Sketches and diagrams must be large, neat and fully labelled.
4. Show ALL calculations and round off answers correctly to TWO decimal places.
5. Number the answers correctly according to the numbering system used in this question paper.
6. You may use a non-programmable calculator.
7. Show the units for ALL answers of calculations.
8. A formula sheet is attached at the end of this question paper.
9. Write neatly and legibly. Electrical Technology: Power Systems 3 DBE/2019 SC/NSC

1. Q1 Occupational Health and Safety1.1 Explain the importance of having the correct light intensity in an electrical 10 marks
2. Q2 Three-Phase Ac Generation2.1 State TWO disadvantages of single-phase power generation. (2) 20 marks
3. Q3 Three-Phase Transformers3.1 With reference to the construction of transformers, answer the questions that 20 marks
4. Q4 Three-Phase Motors and Starters4.1 With reference to the construction of motors, state the functions of the 40 marks
5. Q5 5.1 State THREE factors that affect the impedance of an RLC circuit. (3) 20 marks
6. Q6 Logic6.1 Draw the symbol of EACH of the following, when using ladder logic with 40 marks
7. Q7 Amplifiers7.1 Describe the following terms with reference to operational amplifiers: 50 marks

Instructions to candidates

1. This question paper consists of SEVEN questions.
2. Answer ALL the questions.
3. Sketches and diagrams must be large, neat and fully labelled.
4. Show ALL calculations and round off answers correctly to TWO decimal places.
5. Number the answers correctly according to the numbering system used in this question paper.
6. You may use a non-programmable calculator.
7. Show the units for ALL answers of calculations.
8. A formula sheet is provided at the end of this question paper.
9. Write neatly and legibly. Electrical Technology 3 DBE/2018 SCE