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Pune University - FY BSc ELECTRONIC SCIENCE - I, April 2010 (Old Course)

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Total No. of Questions : 5] P240 [Total No. of Pages : 2 [3717] - 72 F.Y. B.Sc. ELECTRONIC SCIENCE - I EL1-T1 : Principles of Analog Electronics (Paper - I) (Old Course) (2004) Time : 3 Hours] Instructions to the candidates: 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Draw the neat diagrams wherever necessary. [Max. Marks : 80 Q1) Answer the following questions in brief (any eight) : [16] a) b) Draw square waveform with 50% duty cycle. Write the applications of P-N junction diode. c) d) e) Enlist important members of thyristor family. Draw I-V characteristics of triac. Define tolerance term and give tolerance for different colors. f) Numerical codes on ceramic disc capacitor is 102. Write value in terms of farad. Write advantages of fixed biasing for BJT. g) h) i) What is small signal amplifier? An Electric current of 20 mA was found to flow through a resistor when potential difference of 2Volt was applied across it. Determine the resistance of the network. Q2) Answer the following (any four) : [16] a) What is resistor? Draw its symbol. Classify it and explain any one in brief. b) c) State Kirchoff s Current Law (KCL) and Voltage Law (KVL). What is T & network? Give its conversion formulae for T and networks. d) Draw IV characteristics of linear and nonlinear devices. e) Explain field effect transistor as voltage variable resistor (VVR). P.T.O. Q3) Answer the following (any four) : [16] a) Explain RC low pass filter with suitable diagram. b) Define and of BJT. Obtain relationship between them. c) Explain diode clipping circuit with applications. d) Draw full wave rectifier and explain in brief. e) What is fuse? Draw its symbol and write technical terms associated with it. Q4) Answer any two of the following : [16] a) What is MOSFET? Explain types of MOSFET with IV characteristics curve. b) Compare FET and BJT. Give FET specification parameters and applications of FET. c) The resistance in a T network shown below has R1 = 10 , R2 = 15 and R3 = 6 . Obtain Ra, Rb and Rc. Draw network equivalent to T network. Q5) Answer any two of the following : [16] a) Find the value of load resistance for following network, such that maximum will be delivered to the load resistance (RL). For the same network find current flows thr' R1 and R2. b) c) What is biasing of the transistor? Describe fixed biasing and potential divider biasing with the help of suitable diagram. Give disadvantages of fixed biasing. List and draw different types of Independent sources and dependent sources. State applications of independent source. vvvv [3717]-72 2

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Additional Info : F.Y. BSc. ELECTRONICS EL1 - T1 : Principles of Analog Electronics (Paper - I) (Old Course) (2004) (Paper - I), Pune University
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