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Pune University - SY BSc (Sem - II) VOC ELECTRONIC EM : Paper - II, April 2010

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Total No. of Questions : 4] P518 [Total No. of Pages : 2 [3717]-246 S.Y. B.Sc. (Vocational) ELECTRONIC EQUIPMENT MAINTENANCE VOC-EEM-222 : Maintenance and Repair of Audio, Video, Office and Communication Equipment (Sem. - II) (Paper - II) (New Course) Time : 2 Hours] [Max. Marks : 40 Instructions : 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Use of log table/calculator is allowed. Q1) Answer all of the following: a) What is the bandwidth of FM broadcast channel? [1] b) What causes temporary loss of satellite signal? [1] c) What causes 'moire' effect in a TV picture? [1] d) How many photodiodes are present in the detector block of a CD player? [1] e) Explain the fault of 'Noisy picture on playback' in case of a VCR. [2] f) What is the need for formatting a mobile phone? What is the effect of formatting? [2] g) If AGC is faulty, what is the symptom in radio reception? h) What could be the fault if there is no output signal from any of the channel in a stereo system? [2] [2] Q2) Answer any two of the following. a) Explain different causes of irregular tape movement in a tape recorder.[4] b) Explain the faults in diode detector and AGC circuit in an AM Receiver. [4] c) Explain any two faults and their causes in a mobile phone instrument.[4] P.T.O. 1 Q3) Answer any two of the following. a) How can the faulty section in a TV be located if there is: Snowy picture with distorted sound. No raster, sound normal. [4] b) Explain the setup for aligning IF stages of a TV Receiver. [4] c) What is the difference between a VCD and a DVD? How do the players differ? [4] Q4) Answer the following. a) What is degaussing in CRT picture tubes? How is it done? [6] b) Explain the working of optical head in a CD player. [6] OR a) Write a note on trouble shooting in inkjet printers. b) What is 'stereo' effect? What are the parts in a typical music system? [6] Explain any two typical faults occurring in such a system. [3717]-246 2 -2- [6]

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Additional Info : S.Y. B.Sc. Electronic Equipment Maintenance (Semister - II), VOC - EEM - 222 : Maintenance & Repair of Audio, Video, Office & Communication Euipments (Paper - II) (New Course) (Vocational), Pune University
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