Electrical Technology Nov 2022 (Electronics) Eng_hlayiso.com_.pdf

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE GRADE 12 ELECTRICAL TECHNOLOGY: ELECTRONICS NOVEMBER 2022 MARKS: 200 TIME: 3 hours This question paper consists of 25 pages, a 1-page formula sheet and a 4-page answer sheet. Copyright reserved Please turn over

Downloaded from hlayiso.com Electrical Technology: Electronics 2 DBE/November 2022 NSC INSTRUCTIONS AND INFORMATION 1. This question paper consists of SIX questions. 2. Answer ALL the questions. 3. Answer the following questions on the attached ANSWER SHEETS: QUESTIONS 4.2.2 and 4.7.3 QUESTIONS 5.2.4 and 5.3.4 QUESTIONS 6.2.3 and 6.6.2 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. Copyright reserved Please turn over

Downloaded from hlayiso.com Electrical Technology: Electronics 3 DBE/November 2022 NSC QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.15) in the ANSWER BOOK, e.g. 1.16 D. 1.1 A/An … is an occurrence when a serious or unexpected dangerous situation occurs that requires immediate attention. A evacuation procedure B non-critical incident C critical incident D unsafe condition (1) 1.2 The total opposition against the flow of alternating current in an RLC circuit is the ... A inductive reactance. B impedance. C capacitive reactance. D inductance. (1) 1.3 When decreasing frequency to below resonance in a series RLC resonance circuit, the … A impedance increases and the circuit becomes inductive. B voltage drop across the inductor and capacitor increases. C impedance decreases and the circuit becomes capacitive. D impedance increases and the circuit becomes capacitive. (1) 1.4 The opposition to AC current flow caused by a capacitor will increase when the ... A capacitance is decreased. B frequency is increased. C voltage is decreased. D current is increased. (1) 1.5 If the emitter of the UJT is supplied with sufficient current, its operating point will continue falling until the ... is reached. A cut-off voltage B pinch-off voltage C valley point voltage D breakdown voltage (1) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 4 DBE/November 2022 NSC 1.6 A Darlington transistor amplifier develops a very low output impedance when used as common ... A base. B emitter. C collector. D drain. (1) 1.7 An op-amp circuit without any feedback has ... gain. A closed-loop B forward-loop C reverse-loop D open-loop (1) 1.8 The pin that sets the voltage at which the 555 will trigger is known as ... A output. B discharge. C threshold. D reset. (1) 1.9 A ... is used to eliminate switch bounce in electronics circuits. A monostable multivibrator B audio amplifier C astable multivibrator D oscillator (1) 1.10 A circuit used in an audio mixer to individually amplify or attenuate each input signal is the ... A comparator B Schmitt trigger C summing amplifier D inverting op amp (1) 1.11 A basic op-amp comparator circuit uses ... A feedback. B positive feedback. C negative feedback. D no feedback. (1) 1.12 A ... produces an output which is directly proportional to the rate of change of the input signal. A passive RC integrator B comparator C passive RC differentiator D non-inverting amplifier (1) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 5 DBE/November 2022 NSC 1.13 A circuit that passes a chosen range of frequencies and blocks frequencies higher and lower than that range is called a ... A high pass filter. B low pass filter. C medium pass filter. D band-pass filter. (1) 1.14 When a circuit experiences a loss of signal power between its input and output, it is called ... A amplification. B noise. C attenuation. D oscillation. (1) 1.15 The bandwidth of a common emitter RC amplifier falls between the ... A upper frequencies. B midrange frequencies at the -3 dB roll-off points. C critical frequencies. D input capacitance of the transistor. (1) [15] QUESTION 2: OCCUPATIONAL HEALTH AND SAFETY 2.1 State TWO human rights in the workplace that ensure that the dignity of the employer is not infringed. (2) 2.2 State TWO evacuation steps to be followed when an emergency alarm is sounded in a workshop. (2) 2.3 Explain why the misuse of equipment in a workshop could cause a health or safety threat. (2) 2.4 Refer to victimisation at the workplace and state TWO actions that are forbidden by the employer. (2) 2.5 State TWO types of risk analysis reports done by the health and safety representative. (2) [10] Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 6 DBE/November 2022 NSC QUESTION 3: RLC CIRCUITS 3.1 Explain the term inductance with reference to RLC circuits connected to an AC supply. (2) 3.2 Draw the phasor diagrams for FIGURES 3.2.1 and 3.2.2 in the ANSWER BOOK. 3.2.1 VR +V 1800 3600 0 t I -V FIGURE 3.2.1: VOLTAGE AND CURRENT WAVEFORMS (2) 3.2.2 +V Vc I 2700 3600 0 900 1800 -V FIGURE 3.2.2: VOLTAGE AND CURRENT WAVEFORMS (2) 3.3 A series RLC circuit with a resistance of 25 Ω, an inductive reactance of 94 Ω and a capacitive reactance of 13 Ω is connected across a 150 V/60 Hz AC supply. Answer the questions that follow. Given: R = 25 Ω XC = 13 Ω XL = 94 Ω VT = 150 V f = 60 Hz 3.3.1 Calculate the impedance of the circuit. (3) 3.3.2 Calculate the phase angle of the circuit. (3) 3.3.3 Calculate the value of the inductor. (3) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 7 DBE/November 2022 NSC 3.3.4 Explain what is meant by a lagging power factor. (1) 3.3.5 Explain why the current and the voltage waveforms are in phase in a series RLC resonance circuit. (2) 3.4 Refer to FIGURE 3.4 and answer the questions that follow. Ic 7 A IR = 11 A VT = 110 V θ IX IT IL 9A FIGURE 3.4: PARALLEL RLC PHASOR DIAGRAM Given: IL = 9A IC = 7A IR = 11 A VT = 110 V 3.4.1 Calculate the total current. (3) 3.4.2 Calculate the power factor. (3) 3.4.3 Calculate the total power. (3) 3.4.4 State, with a reason, whether the circuit has a leading or lagging power factor. (2) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 8 DBE/November 2022 NSC 3.5 Refer to FIGURE 3.5 and answer the questions that follow. Z I f f fr fr A B FIGURE 3.5: IMPEDANCE AND CURRENT RESPONSE CURVES 3.5.1 Name the circuit that produces the response at A and B in FIGURE 3.5. (2) 3.5.2 Discuss the difference between the impedance and current at resonant frequency. (2) 3.5.3 Describe what happens to impedance when the frequency increases in FIGURE 3.5 A. (2) [35] Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 9 DBE/November 2022 NSC QUESTION 4: SEMICONDUCTOR DEVICES 4.1 Refer to FIGURE 4.1 and answer the questions that follow. +VDD D1 Lamp D RIN G +VIN S VOUT RGS 0V FIGURE 4.1: MOSFET AS A SWITCH 4.1.1 Identify the type of MOSFET used in this circuit. (1) 4.1.2 Explain how an increase in VGS would affect the MOSFET in the circuit. (3) 4.2 Refer to FIGURE 4.2 and answer the questions that follow. ID VGS Q- point ID VGS Input FIGURE 4.2: CHARACTERISTIC CURVE 4.2.1 Identify the characteristic curve in FIGURE 4.2. (1) 4.2.2 Draw the output waveform on the ANSWER SHEET for QUESTION 4.2.2. (3) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 10 DBE/November 2022 NSC 4.3 Refer to FIGURE 4.3 and answer the questions that follow. Base 2 rb2 + Emitter Vx VBB - rb1 Base 1 FIGURE 4.3: OPERATIONAL REPRESENTATION OF THE UJT 4.3.1 State ONE application of the UJT. (1) 4.3.2 Explain what happens when the external voltage (V BB) is applied to the base terminals of the UJT. (2) 4.3.3 A UJT characteristic curve shows three main regions of operation, namely cut-off, negative resistance and saturation. Describe the operation of the UJT in the negative resistance region. (3) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 11 DBE/November 2022 NSC 4.4 Refer to FIGURE 4.4 and answer the questions that follow. +VBB R1 R2 E B2 UJT B1 C R3 0V FIGURE 4.4 4.4.1 Identify the circuit diagram in FIGURE 4.4. (1) 4.4.2 Discuss the operation of the circuit in FIGURE 4.4. (4) 4.5 Refer to FIGURE 4.5 and answer the questions that follow. +9V N/C N/O Relay coil Flywheel diode COM C 1 kΩ B Input E 0V FIGURE 4.5: DARLINGTON TRANSISTOR CIRCUIT 4.5.1 State the application of the circuit in FIGURE 4.5. (1) 4.5.2 State the function of the flywheel diode in the circuit diagram. (1) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 12 DBE/November 2022 NSC 4.5.3 Describe why the N/O contact will close when a supply is connected to the circuit. (3) 4.6 Refer to FIGURE 4.6 and answer the questions that follow. R F = 1, 4 kΩ RIN = 1 kΩ + 15 V A _ + VOUT 0V - 15 V FIGURE 4.6: INVERTING OPERATIONAL AMPLIFIER 4.6.1 State the voltage at point A. (1) 4.6.2 Calculate the gain of the op amp. (3) 4.6.3 State the phase relationship between the input and the output signal when an AC signal is applied to the input. (1) 4.7 Refer to FIGURE 4.7 and answer the questions that follow. VOUT / V D A +VSAT +13 +10 RF 39 kΩ +5 C O RIN VIN / V 3 kΩ +V -2 -1 +1 +2 _ -5 VIN + VOUT -10 0V -V -13 -VSAT B E A B FIGURE 4.7: INVERTING OPERATIONAL AMPLIFIER 4.7.1 Identify the saturation regions in FIGURE 4.7 B. (2) 4.7.2 Calculate the gain by using the voltage values on FIGURE 4.7 B. (3) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 13 DBE/November 2022 NSC 4.7.3 Draw the output waveform on the ANSWER SHEET for QUESTION 4.7.3 when the op amp is saturated. +V 1 Input t -1 -V +VSAT Output t -VSAT FIGURE 4.7.3 (3) 4.7.4 State THREE advantages of increasing the value of RF. (3) 4.8 Refer to FIGURE 4.8 and answer the questions that follow 0V 1 8 +Vcc TRIGGER 2 7 DISCHARGE 555 IC OUTPUT 3 6 THRESHOLD RESET 4 5 CONTROL VOLTAGE FIGURE 4.8: 555 IC PIN LAYOUT 4.8.1 State the function of pin 7. (1) 4.8.2 Describe how the 555 IC is triggered with reference to pin 2. (4) [45] Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 14 DBE/November 2022 NSC QUESTION 5: SWITCHING CIRCUITS 5.1 State the difference between a monostable multivibrator and an astable multivibrator with reference to their output states. (2) 5.2 FIGURE 5.2 shows a bistable multivibrator using a 555 IC. Answer the questions that follow. +6V R2 R1 10 kΩ 10 kΩ 8 4 7 555 3 6 2 LED 1 5 S1 S2 C2 R3 Set Reset 10 nF 330 Ω VCC Trigger input when S1 is pressed 0V VCC Trigger input when S2 is pressed 0V VCC Output 0V FIGURE 5.2: BISTABLE MULTIVIBRATOR 5.2.1 State ONE application of a bistable multivibrator. (1) 5.2.2 Explain why threshold pin 6 is connected directly to ground. (3) 5.2.3 Explain what will happen to the input voltage on pin 2 if resistor R 2 is disconnected from the supply leaving it as an open circuit. (2) 5.2.4 Draw the output waveform on the ANSWER SHEET for QUESTION 5.2.4. (3) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 15 DBE/November 2022 NSC 5.3 FIGURE 5.3 shows a 741 monostable multivibrator circuit in its natural resting condition. Answer the questions that follow. C1 1µF +9 V VIN VIN +9 V VB VOUT VOUT C2 R2 -9 V -9 V -VREF R3 VB FIGURE 5.3: 741 IC MONOSTABLE MULTIVIBRATOR 5.3.1 State the purpose of C2 and R3. (2) 5.3.2 Determine the voltage at the non-inverting input (VB) when capacitor C2 is fully charged to the saturation voltage of 9 V and no current flows through R3. (1) 5.3.3 Explain what happens to the output voltage the moment a positive input pulse is applied to the inverting input. (3) 5.3.4 Draw the output waveform on the ANSWER SHEET for QUESTION 5.3.4. (4) 5.4 Refer to FIGURE 5.4 below and answer the questions that follow. RF VA +9V +9V VA VUIT +VB VB R1 - 9V 0 - 9V C -VB R 2 R2 V =V × B OUT R + R 1 2 FIGURE 5.4: 741 IC ASTABLE MULTIVIBRATOR 5.4.1 Determine the polarity of VB when the output is positive. (1) 5.4.2 Refer to VA and VB and state when the output changes from +9 V to –9 V. (1) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 16 DBE/November 2022 NSC 5.4.3 Describe how an increase in the value of RF affects the operation of the circuit. (3) 5.5 Refer to FIGURE 5.5 and answer the questions that follow. +9V Input Vin Output VX RF -9V +9 V R1 Vout -9 V FIGURE 5.5: SCHMITT TRIGGER 5.5.1 Determine the saturation voltages of the Schmitt trigger. (1) 5.5.2 Explain the purpose of RF and R1 in the circuit. (2) 5.5.3 State when the output changes from high to low. (2) 5.6 Explain the operation of the circuit in FIGURE 5.6. +V +V Vref R1 Input + Vcc 0 VIN t 741 VOUT + VSAT Output - Vcc Rref - VSAT t FIGURE 5.6: OP-AMP COMPARATOR (3) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 17 DBE/November 2022 NSC 5.7 Refer to FIGURE 5.7 and answer the questions that follow. RF 22 kΩ R1 22 kΩ R2 22 kΩ +12 V V1 - V2 R3 22 kΩ + VOUT -12 V V3 FIGURE 5.7: OP-AMP CIRCUIT Given: R1 = R2 = R3 = RF = 22 kΩ Vs = +12 V/-12 V V1 = 0,9 V V2 = 1,2 V V3 = 2,1 V 5.7.1 Identify the op-amp circuit in FIGURE 5.7. (1) 5.7.2 Determine the gain of the amplifier. Motivate your answer. (2) 5.7.3 Calculate the output voltage. (3) 5.7.4 Explain the effects of increasing the value of the feedback resistor. (2) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 18 DBE/November 2022 NSC 5.8 Refer to FIGURE 5.8 and answer the questions that follow. CF RIN +V VIN - VIN VOUT 0 + t 0 -V VOUT -V 0V FIGURE 5.8: OP-AMP INTEGRATOR 5.8.1 State TWO factors that determine the output voltage of the circuit at any time. (2) 5.8.2 Explain why capacitor CF charges at a fixed linear rate towards –V when a positive square wave is fed to the input. (4) 5.8.3 Explain the effect of a long RC time constant on the output. (2) [50] Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 19 DBE/November 2022 NSC QUESTION 6: AMPLIFIERS 6.1 State TWO categories of amplifiers. (2) 6.2 Refer to FIGURE 6.2 and answer the questions that follow. +20 Vcc Ic (mA) RC IB= 140 µf RB 3,3 kΩ 6 IB= 120 µf VOUT 5 IB= 100 µf 4 IB= 80 µf 3 IB= 60 µf Q1 2 IB= 40 µf IB= 20 µf 1 IB= 0 µf (V) 4 8 12 16 20 VCE 0V TRANSISTOR BIASING FIGURE 6.2: CHARACTERISTIC CURVE OF A TRANSISTOR CIRCUIT 6.2.1 Determine the maximum voltage across the collector emitter terminal of the transistor. (1) 6.2.2 Calculate the maximum collector current in FIGURE 6.2. (3) 6.2.3 Draw the load line for the amplifier in FIGURE 6.2 on ANSWER SHEET 6.2.3. (2) 6.2.4 Indicate the bias point on the load line on ANSWER SHEET 6.2.3 when the amplifier in FIGURE 6.2 is biased as a Class A amplifier. (1) 6.2.5 Determine the value of the collector current at the class A bias point. (1) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 20 DBE/November 2022 NSC 6.3 Refer to FIGURE 6.3 and answer the questions that follow. + VCC R1 RC1 R3 RC2 C2 C3 C1 Q1 Q2 Output Input CE1 CE2 R2 RE1 R4 RE2 0V FIGURE 6.3: TWO-STAGE RC-COUPLED AMPLIFIER 6.3.1 State the function of R1 and R2. (2) 6.3.2 Explain why the values of the coupling capacitors are purposely selected to be as large as possible. (1) 6.3.3 State the purpose of RE. (2) 6.3.4 Describe the function of the RC coupling. (2) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 21 DBE/November 2022 NSC 6.4 Refer to FIGURE 6.4 and answer the questions that follow. +VCC T1 T2 R1 R3 speaker Q1 Q2 Input R2 R E1 C1 R4 C2 R E2 C3 0V FIGURE 6.4: TWO-STAGE TRANSFORMER-COUPLED AMPLIFIER 6.4.1 State ONE application of the transformer-coupled amplifier. (1) 6.4.2 State TWO advantages of the circuit in FIGURE 6.4. (2) 6.4.3 Name TWO devices, apart from the speaker, that can be connected across the terminals of transformer T2. (2) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 22 DBE/November 2022 NSC 6.5 FIGURE 6.5 below represent the radio-frequency amplifier. Answer the questions that follow. +VCC T2 R1 C1 C2 Output T1 Q1 Input R2 C3 RE CE 0V FIGURE 6.5: RADIO-FREQUENCY AMPLIFIER 6.5.1 State ONE purpose of CE. (1) 6.5.2 Describe the functions of the radio-frequency amplifier. (2) 6.5.3 Explain why variable pre-set capacitors C1 and C2 have been used with transformer T2. (2) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 23 DBE/November 2022 NSC 6.6 Refer to FIGURE 6.6 and answer the questions that follow. 1 2 S DC + C L supply - FIGURE 6.6: TANK CIRCUIT 6.6.1 Describe what would occur when switch S is moved to position 2. (2) 6.6.2 Draw the voltage waveform across the capacitor on the ANSWER SHEET for QUESTION 6.6.2 after the switch is moved to position 2. (3) 6.6.3 State how the frequency of this tank circuit can be increased. (1) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 24 DBE/November 2022 NSC 6.7 Study FIGURE 6.7 and answer the questions that follow. + VCC R B1 RF choke C1 Cc C2 Output Q1 L2 RB 2 RE CE C3 L1 0V FIGURE 6.7: HARTLEY OSCILLATOR CIRCUIT DIAGRAM 6.7.1 State ONE application of the Hartley oscillator. (1) 6.7.2 State the function of C1 and C2. (2) 6.7.3 Describe how the state of oscillation can be maintained. (2) Copyright reserved Please turn page

Downloaded from hlayiso.com Electrical Technology: Electronics 25 DBE/November 2022 NSC 6.8 Refer to FIGURE 6.8 and answer the questions that follow. +VCC RB RC C5 VOUT C1 C2 C3 Q1 R1 R2 R3 R4 C4 0V FIGURE 6.8: RC PHASE-SHIFT OSCILLATOR 6.8.1 State ONE function of transistor Q1. (1) 6.8.2 Describe how the frequency of the oscillator in FIGURE 6.8 can be adjusted if the value of the resistors are kept the same. (2) 6.8.3 Compare the feedback used in transistor amplifiers to oscillator circuits. (2) 6.9 State the difference between LC and RC oscillators with reference to frequency. (2) [45] TOTAL: 200 Copyright reserved

Downloaded from hlayiso.com Electrical Technology: Electronics DBE/November 2022 NSC FORMULA SHEET RLC CIRCUITS SEMICONDUCTOR DEVICES P  V  I  cos θ V R RF Gain A V  OUT   F A V = 1+ XL  2 fL VIN RIN RIN 1  R  XC  VOUT  VIN    F  2 fC  R IN  1 f f fr  OR fr  2 1  R  2 LC 2 VOUT  VIN  1  F  f  RIN  BW  r OR BW  f2  f1 Q SWITCHING CIRCUITS Series  R R R  VOUT    V1 F  V2 F  ...VN F  VR  I R  R1 R2 RN  VL  I XL VOUT VOUT Gain A V   VC  I XC VIN V1  V2  ...VN  VT VOUT   (V1  V2  ...VN ) IT  OR IT  IR  IC  IL Z AMPLIFIERS V Z  R 2  X L  X C  IC  C VCC  VCE  ICRC 2 RC VT  VR  VL  VC  VT  I Z VB  VBE  VRE 2 2 OR R VR VOUT Cos θ  OR Cos θ  AV  Z VT VIN XL XC VL VC 1 L I I Q     A I  OUT OR β C R R VT VT R C IIN IB Parallel P A P  OUT OR AP  A V A I VT  VR  VL  VC PIN OR VT IR  A = β1 x β2 OR A V  A V1  A V2  A V3 R VT IC  PIN  I2  ZIN POUT  I2  Z OUT XC AND Oscillation frequency V IL  T fo  1 1 XL OR fo  2  π LC 2  π 6 RC IT  IR  IL  IC  2 2 GAIN IN DECIBELS VT I Z A I  20log10 OUT IT IIN I V Cos θ  R A V  20log10 OUT IT VIN R R IL IC POUT Q    A P  10log10 X L X C IT IT PIN Copyright reserved

Downloaded from hlayiso.com Electrical Technology: Electronics DBE/November 2022 NSC CENTRE NUMBER: EXAMINATION NUMBER: ANSWER SHEET QUESTION 4: SEMICONDUCTOR DEVICES 4.2.2 ID VGS Q - point ID VGS Input Transfer mark to answer book FIGURE 4.2.2 MOD (3) Copyright reserved

Downloaded from hlayiso.com Electrical Technology: Electronics DBE/November 2022 NSC CENTRE NUMBER: EXAMINATION NUMBER: ANSWER SHEET 4.7.3 +V 1 Input t -1 -V +VSAT Output t Transfer mark to answer book -VSAT FIGURE 4.7.3 MOD (3) Copyright reserved

Downloaded from hlayiso.com Electrical Technology: Electronics DBE/November 2022 NSC CENTRE NUMBER: EXAMINATION NUMBER: ANSWER SHEET QUESTION 5: SWITCHING CIRCUITS 5.2.4 VCC Trigger input when S1 is pressed 0V VCC Trigger input when S2 is pressed 0V VCC Output 0V Transfer mark to answer book FIGURE 5.2.4 MOD (3) 5.3.4 VIN +9 V VOUT -9 V VB Transfer mark to answer book FIGURE 5.3.4 MOD (4) Copyright reserved

Downloaded from hlayiso.com Electrical Technology: Electronics DBE/November 2022 NSC CENTRE NUMBER: EXAMINATION NUMBER: ANSWER SHEET QUESTION 6: AMPLIFIERS 6.2.3 Ic (mA) 7 6 IB= 140 µf 5 IB= 120 µf IB= 100 µf 4 IB= 80 µf 3 IB= 60 µf 2 IB= 40 µf 1 IB= 20 µf IB=0µ f (V) 4 8 12 16 20 VCE Transfer mark to answer book FIGURE 6.2.3 MOD (2) 6.6.2 +V t Transfer mark to answer book -V FIGURE 6.6.2 MOD (3) Copyright reserved