Electronic Fundamentals (Digital and Analogue) (2hours)
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1 C1.0 ANALOGUE FUNDAMENTALS COMPETITOR S INSTRUCTION:- Attempt all questions: Circle the letter that indicates the correct answer. C1.1 The prefix nano stands for: (a) 106 (b) 103 (c) 10 3 (d) 10 6 (Marks 1.0) C1.2 The voltage of 2,000 V can be expressed in powers of 10 as: (a) 2 mv (b) 2 kv (c) 2 MV (d) 2 GV (Marks 1.0) C1.3 The unit of power is: (a) Coulomb (b) Ampere (c) Volt (d) Watt (Marks 1.0) C1.4 The voltage across a 100W bulb that delivers a current of 10 A is: (a) 11 kv (b) 1100 V (c) 110 V (d) 10 V (Marks 1.0) C1.5 a) Find the equivalent circuit resistance (R eq ) of the circuit shown in figure 1. b) Which parallel network current is the largest? Mark 2.0) Answer: Figure 1 a) b) Page 1 of 7
2 C2.0 TRANSISTOR AMPLIFIER. A common emitter amplifier has the schematic as shown in Figure 2. Components R2 and R4 values are not shown. Build circuit onto the breadboard using a PN2222 transistor. Figure 2 C1, C2, are 10 µf, C3 is 100uF and C4 is 0.1µF R1 100K R2=? R4=? R3 = 4K7 RL= 100K Power Supply voltage is 20V, Input Signal 28m V rms at 10 khz Sine-wave. C2.1 Calculate a suitable value of R2. (Marks 1.0) C2.2 Calculate the value of R4 so that the emitter current is approx 2.16mA. Take V BE =0.7V. Show your calculation. Choose the closest preferred value of resistor. (Marks 2.0) C2.3 Determine the theoretical ac gain of the circuit. Write down a formula to support your answer. (Marks 3.0) C2.4 Calculate VC the dc voltage at the collector. Show calculation (Marks 1.0) C2.5 Build the circuit. Now apply a signal of 28m V rms, frequency 10 KHz to the input. (Marks 1.0) C2.6 Measure the output waveform with an oscilloscope and graph the waveforms. On your graph state the peak value of the input and the output and determine the gain as a number. Also check quiescent value of V C (Marks 3.0) C2.7 Demonstrate the functionality of the working circuit to a judge. (Marks 1.0) Page 2 of 7
3 Question---C Title Competition No Page 3 of 7
4 C3.0 ACTIVE FILTER: Predict how the operation of this active filter circuit shown on figure 3 will be affected as a result of the following faults. Consider each fault independently (i.e. one at a time, no multiple faults): Figure 3 For each of the following fault conditions, briefly explain why the resulting effects will occur. C3.1 Resistor R1 fails open: (Marks 1.0) C 3.2 Capacitor C1 fails open: (Marks 1.0) C 3.3 Solder bridge (short) across resistor R1: (Marks 1.0) C 3.4 Solder bridge (short) across capacitor C1: (Marks 1.0) C 3.5 Resistor R2 fails open: (Marks 1.0) C 3.6 Resistor R3 fails open: (Marks 1.0) Page 4 of 7
5 C3.1 Resistor R1 fails open: Answer: C 3.2 Capacitor C1 fails open: C 3.3 Solder bridge (short) across resistor R1: C 3.4 Solder bridge (short) across capacitor C1: C 3.5 Resistor R2 fails open: C 3.6 Resistor R3 fails open: Page 5 of 7
6 Digital Fundamentals C4.0 KARNAUGH MAPS C4.1 Simplify the logic represented by the circuit shown in figure 5 using a Karnaugh map (Marks 3.0) Figure 5 C4.2 Draw the simplified circuit (Marks3.0) Page 6 of 7
7 C5.0-4 BIT COUNTER. C5.1 Design and Build a counter that repeatedly counts from 0000,0001,0010,..., 1110,1111,0000, etc. Draw the Schematic of the counter and clearly show all connections. You are supplied with the following information: Counter (see datasheet) 10 Green LEDs (AGILENT HDSP4850) in a package 220 Ohm current limiting resistor s for the LEDs.. (Marks 4.0) C5.2 Test that the Counter is working with an appropriate TTL input and monitor the waveforms on the scope of the four outputs. (Marks 4.0) C5.3 Have a judge to examine the counter, show with a suitable low frequency input that the counter pattern is working on the LEDs. (Marks 2.0) Page 7 of 7
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EXPERIMENT 4: RC, RL and RD CIRCUITs Equipment List Resistor, one each of o 330 o 1k o 1.5k o 10k o 100k o 1000k 0.F Ceramic Capacitor 4700H Inductor LED and 1N4004 Diode. Introduction We have studied