Year 3 Exam Paper for ELTR7011 at Cork Institute of Technology, Exams of Electrical Engineering

Download Year 3 Exam Paper for ELTR7011 at Cork Institute of Technology and more Exams Electrical Engineering in PDF only on Docsity! 1 CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ Semester 2 Examinations 2011 Module Title: Electronic Engineering Module Code: ELTR7011 School: Electrical & Electronic Engineering Programme Title: Bachelor of Engineering in Electronic Engineering – Year 3 Programme Code: EELXE_7_Y3 External Examiner(s): Dr. A. Donnellan, Mr. I. Kennedy Internal Examiner(s): Dr. P. O’Connor Instructions: Answer QUESTION 1 (worth 40 marks) and TWO other questions (worth 30 marks each) Duration: 2 HOURS Sitting: Summer 2011 Requirements for this examination: Graph paper, Log Tables Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator. 2 Note: All figures are at back of the paper 1. (i) For the Op-Amp in Fig.1(i), calculate all the currents and voltages around the circuit if (a) The input voltage V1 = 0V. (b) The input voltage V1 = 3V (5 marks) (ii) Analysis the Op-amp circuit shown in Fig.1(ii) and calculate all the voltages and currents around the circuit. (5 marks) (iii) The Op-Amp shown in Fig.1(iii) has a Sinewave input of at a frequency of 10kHz. Draw a detailed graph of both input and output waveforms using a proper scale and explain your output. (5 marks) (iv) An amplifier is displayed in Fig.1(iv). It has a Sinewave input of at a frequency of 10kHz. (a) Draw the output signal to a correct scale. (b) If the frequency of the input is increased to 100kHz what changes, if any, occur at the output. (c) If changes occur, state any possible solutions to rectify them. (Typical Op-Amp values that you are familiar with may be used). (5 marks) (v) Write a technical note on the AC-Performance of Op-Amps. Your explanation should include the UGB, )(OLcf , )(CLcf , and a frequency response curve to demonstrate your understanding. (5 marks) (vi) An analogue filter’s has a transfer function given by ( ) Sketch its output response and show how you arrived at this response. What type of filter does H(s) represent? (5 marks) (vii) Design a boost converter to provide an output of 36V from a 24V source. The load is 50W. The output voltage ripple must be less than 0.5%. Determine the duty cycle, the inductor size and the capacitor value for a chosen frequency. Your design should be for continuous current and assume ideal components. (5 marks) vA ak wl Output (vo) Ri Ak] RS Fig.1(i) En R2 vi i ‘te a Output (Yo) 15M .. RI 16 a) RG Fig.1(ii) 10k Sk Vin=2Vv = Tow 4OkH: ® Vout 15s 410k) “t vd, Fig.1(iii) 10k Sk Vin=2Vv = Tow 4OkH: ® Vout 15s 410k) an Fig.1(iv)  7 Fig.2(a) Fig.2(b) 0 10 20 30 40 4V Time(ms)