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# 1999 Exam - DEAKIN UNIVERSITY Page 2/14 Unit SEE103 Date...

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Unformatted text preview: DEAKIN UNIVERSITY Page: 2/14 Unit: SEE103 Date: Semester 2, 1999 QUESTION 1 Suppose the decimal integer values from 0 to 255 are to be transmitted. a) How many lines will be needed if parallel representation is used? b) How many lines will be needed if serial representation is used? (2+2 = 4 marks) QUESTION 2 a) Convert the following numbers to decimal: (show all working) i) 10101011 b; ii) 5A h; and iii) 1000010110001BCD. b) Convert the following numbers to binary: (show all working) i) A5 h; ii) 139 d; and iii) 000110010101BCD. (3+3 = 6 marks) QUESTION 3 One of DeMorgans's Theorems is that Z + 73 = XE. Prove that the theorem also works for three variables. That is, prove: Z+§+C=ABC. (3 marks) DEAKIN UNIVERSITY Page: 3/14 Unit: SEE103 Date: Semester 2, 1999 QUESTION 4 a) Write the output expression for ﬁgure 1. b) simplify the output expression with boolean theorems. Figure 1 (2+3 = 5 marks) QUESTION 5 A NC lathe employs a system for monitoring the lathes safety by monitoring sliding door. oil coolant and rotation status. These operate as follows: Door = 1 when sliding door is open; Oil = 1 when oil is present; and Rotation Status = 1 when work piece is rotating. Figure 2 shows the logic circuit that controls a warning light for certain combinations of safety conditions. Assume that a HIGH at output W activates the warning light. a) Determine what conditions will give a warning to the operator. b) Change the circuit to one using all NAND gates. (3+2 = 5 marks) DEAKIN UNIVERSITY Page: 4114 Unit: SEE103 Date: Semester 2. 1 999 __—_—___—_..———--———-—-— QUESTION 6 An edge-triggered D ﬂip-ﬂop and a T ﬂip-ﬂop are wired up as in ﬁgure 3. a) Assume that Q = 0 initially, determine the Q waveform. b) Describe the operation of this circuit: Figure 3 (2+3 = 5 marks) QUESTION 7 Analyse the following circuit and draw its truth table. Is it functionally the same as a NAND gate SR latch? (5 marks) DEAKIN UNIVERSITY Page: 5/14 Unit: SEE103 Date: Semester 2. 1999 ______—__———————-——-—— QUESTION 8 A voltage V= 1.5 sin(754t) volts is applied to an RLC circuit. Vis in volts. tis in seconds. and the angle is in radians. L = 10.0 mH, R = 2 kg, and C = 0.60 pF. a) Determine the impedance. b) Determine the phase angle. c) Determine the RMS current in the circuit. d) Determine the average power dissipated in the circuit. (8 marks) QUESTION 9 A generator supplies 120 volts (rms) to the primary coil of a transformer. The transformer has 500 turns on the primary coil. and 10 turns on the secondary coil. Determine the rms output voltage across the secondary. (3 marks) QUESTION 10 For the bridge circuit of ﬁgure 5, Assume the following values: Vcc = +12 volts; R1 = 1 k9; R2 = 2.2 kg; R3 = 820 9; R4 = 1.2 k9; and RL = 10 k9. Determine the current through the load resistor. RL, by means of any network theorem. 'éc Figure 5 (9 marks) DEAKIN UNIVERSITY Page: 6/14 Unit: SEE103 Date: Semester 2, 1999 ___—____—_—_—.———————_ QUESTION 11 For the circuit of ﬁgure 6. the battery is 6 volts, the diode is silicon. and the resistor is 20009. Assume that the diode characteristics follow the practical or simpliﬁed model. Sketch both the load line and the diode characteristic for this circuit. Show on the load line the location of the Q-point. Figure 6 (6 marks) QUESTION 12 Sketch a circuit diagram for a basic DC power supply, including a transformer, full-wave bridge rectiﬁer. ﬁlter capacitor, surge resistor. and voltage-regulating zener diode. (8 marks) QUESTION 13 For a half-wave rectiﬁer, assuming that the total input voltage is sinusoidal and has a magnitude of 6 volts. Sketch the waveforms for both the input signal, and the output signal across a resistive load. Include at least two cycles. (4 marks) QUESTION 14 A zener regulator is shown in ﬁgure 7. R = 560 9. V2 = 14 volts at 1.5 mA. Assume that the zener diode is ideal. Determine the minimum input voltage for regulation to be established. Figure 7 (5 marks) DEAKIN UNIVERSITY Page: 7/14 Unit: SEE103 Date: Semester 2, 1999 QUESTION 15 Figure 8 shows a circuit containing an NPN transistor such that the base-emitter junction is fom/ard biased and the collector-base junction is reverse biased. Assume the following quantities for the circuit elements: Vcc = 10 volts; VBB = 5 volts; RB =10 kQ; Rc= 100 Q; and ﬁne = 150. Neglect any leakage (cutoff) currents. The base-emitterjunction has across it a voltage drop of 0.7 volts. a) Determine [3, the current at the base. b) Determine lo, the current at the collector. c) Determine IE, the current at the emitter. d) Determine VCE, the voltage drop from the collector to the emitter. (7 marks) DEAKIN UNIVERSITY Page: 8/14 Unit: SEE103 Date: Semester 2. 1999 _—____—__—..___..————-———-—--— QUESTION 16 Figure 9 shows a silicon transistor biased by a voltage divider. Assume the following values: Vcc = +12 volts; R1=47kQ;R2=10kQ; . RC = 4.7 k9; RE = 1k Q; and BDC = 100. Determine the operating point, Q (’c-Vce ). Sketch the load line for this circuit and identify the approximate position of the operating point on the load line. Figure 9 (8 marks) DEAKIN UNIVERSITY Page: 9l14 Unit: SEE103 Date: Semester 2. 1999 QUESTION 17 a) Identify the three op-amp conﬁgurations shown in ﬁgure 10. Figure 10 b) For the ampliﬁer circuit of ﬁgure 10a, R,- = 2.7 kQ. Determine the value of the feedback resistor so that the closed-loop gain is 50. c) For the ampliﬁer of ﬁgure 100, the open-loop gain is 100,000. R,-= 2.7 k9. and Rf: 150 kn. Determine the closed-loop gain. (3+2+2 = 7 marks) DEAKIN UNIVERSITY Page: 10l14 Unit: SEE103 Date: Semester 2, 1999 QUESTION 18 In ﬁgure 11. Vcc = 20 volts. R1 = 22 km, and R2 = 3.3 kQ. The maximum levels of output voltage are :15 volts. An input voltage Vin = 5 sin(cot) volts is applied to the input. Sketch the input signal and the output signal as functions of wt. Indicate those points in the cycle where the output changes state. Figure 11 (5 marks) DEAKIN UNIVERSITY Unit: SEE103 _—_—__—.—___.——-————-——-—-—- APPENDIX 1 ASCII Codes Characte Character I' 1000001 100 0010 100 0011 100 0100 100 0101 100 0110 100 0111 1001000 1001001 1001010 1001011 1001100 1001101 1001110 1001111 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 coooxlaamAwN—on-< RETURN xé<c4mmovOz§rxu—Ioﬂmoow> —_—_—__—————_——_ Boolean Theorems 1) x.o=o 2) x.1=x 3) X.X=X Q xi=o a x+o=x m x+1=1 n x+x=x 8) X+Y=l m X+Y=Y+X 10) X.Y=Y.x 11) X+(Y+Z)=(X+Y)+Z=X+Y+Z 12) X(YZ) = (XY)Z= XYZ 13a) X(Y+Z)=XY+XZ 13b) (W+X)(Y+Z)=WY+XY+WZ+XZ 14) X+XY=X 15) x+§Y=X+Y 16) (X+Y)=Y.Y 17) (x.Y)=i+Y LINEFEED 1011001 1011010 0110000 0110001 0110010 0110011 0110100 0110101 0110110 0110111 0111000 0111001 0100000 0101110 0100100 0101000 0100100 0101010 0101001 0101101 0101111 0101100 0101101 0001101 0001010 5A 30 31 32 33 35 36 37 38 39 20 2E 28 2B 24 29 2D 2F 20 3D 0D 0A Page: 11/14 Date: Semester 2. 1999 Hex ...
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1999 Exam - DEAKIN UNIVERSITY Page 2/14 Unit SEE103 Date...

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