2022 SST Prelim

Page 1 of 25 [Turn over SECONDARY 4 2022 ELECTRONICS 6063/01 2 hours CANDIDATE NAME CLASS INDEX NUMBER READ THESE INSTRUCTIONS FIRST Do not turn over the page until you are told to do so. Write your name, class, and index number in the spaces provided above. Write in dark blue or black ink pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, and glue or correction fluid/tape. Sections A and B Answer all the questions. Write your answers in the spaces provided on the question paper. Approved electronic calculators are allowed for use in this paper. The number of marks is given in brackets [ ] at the end of each question or part question. The total mark for this paper is 100. This document consists of 25 printed pages including the cover page FOR EXAMINER’S USE Section A / 55 Section B / 45 TOTAL / 100

Page 2 of 25 [Turn over

Page 3 of 25 [Turn over Table on Boolean Algebra Section A

Page 4 of 25 [Turn over Answer all questions. Write your answers in the spaces provided. 1 In Table 1.1, tick (  ) the type of subsystem that matches the function of each of the following components. [3] Type of subsystem Component Input Process Output Thermistor Buzzer AND gate Table 1.1 [Total: 3 marks] 2 Table 2.1 below shows two types of wire. Wire Length /m Cross sectional area / m2 Material A 0.20 59 x 10-9 Nichrome B 0.20 118 x 10-9 Nichrome Table 2.1 Based on Table 2.1, compare the resistance of wire A and B. Explain your answer. [2] ……...…..……………………………………………………………………………….………… ……..…..……………………………………………………………………………….………… ……..…..……………………………………………………………………………….………… [Total: 2 marks]

Page 5 of 25 [Turn over 3 Fig. 3.1 shows a resistor with coloured bands. Fig 3.1 Determine the range of resistance values for the resistor in Fig. 3.1. Leave your answers in exact values. [2] ……..…..……………………………………………………………………………….………… [Total: 2 marks] 4 Fig. 4.1 shows a circuit with four resistors connected to a 10 V battery. Fig. 4.1 (a) Calculate the effective resistance of the circuit. [3] .…..……………………………………………………………………………….………… (b) State the potential difference across R3. [1] …..……………………………………………………………………………….…………

Page 6 of 25 [Turn over (c) Determine the power delivered to R3. [2] .…..……………………………………………………………………………….………… (d) Circle the suitable power rating for R3. [1] 0.125 W 0.25 W 0.5 W 1.0 W 2.0 W (e) Fig. 4.2 shows a wire connected between point CD. Fig. 4.2 State the change, if any, in the current passing through R3. Explain your answer. [2] …..……………………………………………………………………………….………… …..……………………………………………………………………………….………… …..……………………………………………………………………………….………… …..……………………………………………………………………………….………… [Total: 9 marks]

Page 7 of 25 [Turn over 5 Fig. 5.1 shows the direction of the currents in a circuit. Fig. 5.1 (a) Using KVL, form the equation for the loops ABCFA and FCDEF. [2] Loop ABCFA: …………………………………………………………………………… Loop FCDEF: …………………………………………………………………………… (b) Using KCL, form the equation for the junction C. [1] …..……………………………………………………………………………….………… [Total: 3 marks]

Page 8 of 25 [Turn over 6 Fig. 6.1 shows the breadboard connection of a circuit. Fig. 6.1 (a) In the space below, draw the circuit diagram of Fig. 6.1. [3] (b) Based on your circuit diagram in (a), determine the total capacitance of the circuit. Each capacitor is 220 uF. [2] ……………..……….……………………………………………………………………… [Total:5 marks]

Page 9 of 25 [Turn over 7 Fig. 7.1 shows two different diode circuits, where Vin is connected to the input circuit. Circuit A Circuit B Fig. 7.1 Sketch and label the peak voltages on Fig. 7.2 to show the output of circuit A and circuit B using the simplified diode model. Assume that the diode has a forward voltage of 0.70 V (a) Circuit A [2] (b) Circuit B [3] Fig 7.2 [Total: 5 marks]

Page 10 of 25 [Turn over 8 (a) Fig. 8.1 shows two configurations of the BJT amplifier. State each configuration in Fig. 8.1. [2] Ans: Ans: Fig. 8.1 (b) Fig. 8.2 shows a BJT configured as an amplifier. Assume VBE to be 0.70 V. Fig. 8.3 shows the Vin and Vout waveform. Fig. 8.2 Fig. 8.3