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Pune University - FY BSc ELECTRONICS (Paper - I), April 2010

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Total No. of Questions : 5] [Total No. of Printed Pages : 4 [3718]-5 F. Y. B. Sc. (Computer Science) Examination - 2010 ELECTRONICS PAPER - I ELECTRONIC DEVICES, CIRCUITS AND COMPUTER PERIPHERALS (New 2008 Pattern) Time : 3 Hours] [Max. Marks : 80 Instructions : (1) All questions are compulsory. (2) Use of non-programmable electronic calculator is allowed. (3) Draw neat diagram wherever necessary. Q.1) Attempt the following : [8x2=16] (a) Draw Symbols of Ideal Current Source and Ideal Voltage Source. (b) Define the given terms w.r.t. P-N Junction Diode : Knee Voltage, Peak Inverse Voltage (PIV) (c) State any two advantages of FET over BJT. (d) Draw output characteristics of C.E. Configuration. (e) State types of amplifier based on Q Point Position. (f) Find frequency of oscillation for phase shift oscillator if R = 10k and C = 0.01 F. (g) Draw block diagram of Linear Regulated Power Supply. (h) State any four components of Motherboard. [3718]-5 1 P.T.O. Q.2) Attempt any four of the following : [4x4=16] (a) Explain working principle of Zener Diode. (b) Explain FET as Voltage Variable Resistor (VVR). (c) Define the following terms w.r.t. Op-Amp : (i) CMRR (ii) PSRR (iii) Slewrate (iv) Input Bias Current (d) Draw and explain block diagram of SMPS. (e) Give various steps involved in image formation in LASER Printer. State any two advantages of LASER Printer. (f) Explain Transistor as an Amplifier. Q.3) Attempt any four of the following : (a) [4x4=16] Find current flowing through Resistor R3 in the following circuit using Kirchoff s Laws : R1 R2 4k V1 4k R3 V2 6k 20V 24V (b) Draw circuit diagram of Inverting Operational Amplifier and derive Relation for its Output Voltage. (c) Explain working principle of Photodiode. (d) Explain need of UPS. Draw block diagram of Online UPS. (e) Explain concept of reading data from a C.D. ROM. (f) Draw circuit diagram of Hartley Oscillator. Explain its working and write an expression for its frequency of oscillation. [3718]-5 2 Contd. Q.4) Attempt any two of the following : (a) [2x8=16] Explain working principles of : (i) Scanner (ii) Light Pen (b) With neat diagram and waveforms, explain working of Full Wave Rectifier. Compare Half Wave and Full Wave Rectifier. (c) (i) Draw circuit diagram of Op-Amp Subtracter and derive expression for its Output Voltage. (ii) 4k 2k 0.6V I + 2k 10k 3.3k A II + B 0.4V Identify Op-Amp configurations in the above circuit. Write expression for output of each circuit and find voltages at points A and B. (i) Define and of transistor. Derive equation of in terms of . (ii) (d) Draw D.C. Load Line for the following circuit : +vcc = 10V 10k R1 Rc 6k =200 2k [3718]-5 R2 RE 2k 3 P.T.O. Q.5) Attempt any one of the following : (a) (i) [1x16=16] Find Thevenin s and Norton s Equivalent Circuit for the following circuit : 2k R1 V 2k R2 2k R3 A R L = 1k 20V B (ii) Explain working principle of n-channel enhancement only MOSFET. Define the following terms : (1) (2) Amplification Factor (1) Draw circuit diagram of Op-Amp differentiator. Derive an expression for its Output Voltage. (2) (ii) Transconductance (4) (i) A.C. Drain Resistance (3) (b) D.C. Drain Resistance Explain need of Multistage Amplifier. A cascaded amplifier has voltage gains A1 = 10, A2 = 20, A3 = 40. What is the overall voltage gain in decibel ? Explain working principle of CRT and LCD Display. [3718]-5/4

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Additional Info : F.Y. B.Sc. ELECTRONICS (Paper - I) : Electronic devices, Circuits and Computer peripherals (New 2008 Pattern), Pune University
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