Download Circuit Shown - Analogue Electronics - Past Exam Paper and more Exams Electronics in PDF only on Docsity! EE106 Analogue Electronics, 2007/2008 Page 1 of 7 Summer Examinations 2007/ 2008 Exam Code(s) 1BN, 1BP, 1BI Exam(s) 1st Electronic Engineering 1st Electronic & Computer Engineering 1st Industrial Engineering Module Code(s) EE106 Module(s) Analogue Electronics Paper No. 1 Repeat Paper No External Examiner(s) Professor Peter Chung Internal Examiner(s) Professor Gearóid ÓLaighin Mr. Gavin Corley Dr. Edward Jones Instructions: Answer all of question 1, and 2 other questions Question 1 is compulsory and carries 40 marks Choose 2 questions from 2,3 & 4; each carries 30 marks Duration 2 hours No. of Pages 7 (including cover page) Department(s) Electronic Engineering Course Co-ordinator(s) Gavin Corley Requirements: MCQ Handout Statistical Tables Graph Paper Log Graph Paper Other Material Standard Mathematical Tables EE106 Analogue Electronics, 2007/2008 Page 2 of 7 Question 1 is compulsory 1. (a) For the circuit shown in figure 1.1 calculate: (i)The total resistance of the circuit, RT [4 marks] (ii)The total current IT, flowing in the circuit [1 marks] Figure 1.1 1. (b) For the circuit shown in figure 1.2 calculate: (i) The value of the load resistor (RLoad) which will ensure maximum power transfer to the load. [3marks] (ii) The maximum power dissipated in RLoad [2 marks] Figure 1.2 1. (c) From the sinusoidal waveform shown in figure 1.3 calculate: (i) The period (T) of the waveform. [1 marks] (ii) The frequency (f) of the waveform. [1 marks] (iii) The dc offset of the waveform. [1 marks] (iv) The amplitude of the waveform. [1 marks] (v) The peak to peak value (Vp-p) of the waveform [1 marks] Figure 1.3 EE106 Analogue Electronics, 2007/2008 Page 5 of 7 2. For the circuit of figure 2: (a) Calculate the current flowing in the 60Ω resistor due to the 60V voltage source. [7 marks] (b) Calculate the current flowing in the 60Ω resistor due to the 3A current source. [7 marks] (c) Calculate the current flowing in the 60Ω resistor due to the 1.5A current source. [7 marks] (d) Using the principle of superposition, calculate the total current and power dissipated in the 60Ω resistor. [9 marks] Figure 2 EE106 Analogue Electronics, 2007/2008 Page 6 of 7 3. (a) For the Circuit of figure 3.1: (i) Determine the Thévenin equivalent of the circuit inside the box (without the load circuit attached). [12 marks] (ii) Proceed to draw the Norton equivalent of the same circuit [4 marks] (iii) Derive an expression for the total resistance of the load circuit shown on the right of figure 3.1. Proceed to determine what value of R will lead to the maximum power being delivered to the load circuit. [4 marks] Figure 3.1 (b) Derive an expression for the average value of the waveform of figure 3.2. [10 marks] Figure 3.2 EE106 Analogue Electronics, 2007/2008 Page 7 of 7 4. (a) Figure 4 shows a series connected RLC circuit. (i) Determine the total impedance (Z) of the circuit. [5 marks] (ii) Find the value of the capacitor in Farads and the inductor in Henries. [5 marks] (iii) Calculate the magnitude of the supply current I, and voltages VR, VL,VC. [5 marks] (iv) What is the average power delivered to the circuit? [5 marks] Figure 4 (b) A smoothing capacitor is to be added to a half wave rectifier circuit with input: v(t) = 15sin(150πt) and load resistance RL = 2kΩ. (i) Calculate the value of the capacitance necessary in order to keep the ripple of the output voltage below 5%. [6 marks] (ii) Plot two cycles of the smoothed output voltage waveform. Specify an approximation to the average output voltage when the smoothing capacitor is attached. [4 marks]