BASIC ELECTRONICS 2nd SEM EXAM/ECE/CSE/IT/EEE/0664/2661/May 2015

                      SECTION-A

Q1. Do as directed.¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬†15×1=15

  1. Resistivity of a semiconductors lies Between conductors and Insulators.
  2. While forming PN junction, the diffusion is restricted by .
  3. An ideal diode has Zero  forward Resistance .
  4. Under normal operating voltage, the reverse current in a silicon diode is about in¬†1 őľA
  5. A zener diode is always operated in the Zener Breakdown Region.
  6. The three terminals of transistors are Emitter, base and Collector .
  7. A transistor is usually applied for Base and Emitter Terminals.
  8. The best biasing is achieved by adopting Voltage Divider biasing Circuit.
  9. For a good voltage amplifier, its input impedance Equal to should be as compared to the source impedance.
  10. A FET is also called as Uni polar Device.
  11. The turn- on voltage for Silicon diode is 0.7 volt .
  12. Filter circuits are used to reduce AC Components. 
  13. PIV stands for Peak Inverse Volatge . 

                      SECTION-B

Q2. Attempt any five questions.¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬†5×6=30

  1. Explain Reverse Biasing of PN Junction ?
  2. Write a note on Varactor diode. Give its Applications ?
  3. Compare the forward volt-ampere characteristics of a Germanium and a silicon Diode with help of diagram ?
  4. How transistor is used as an amplifier?
  5. Explain why transistor should be Biased ?
  6. A bypass capacitor is connected CE is connected across the emitter resistor RE, why?
  7. Explain the working principle of a FET ?
  8. Explain working of Capacitor- Input ŌÄ Filter ?

                       SECTION-C

Q3. Attempt any three questions.¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† ¬† 3×10=30

  1. ¬†With the¬† help¬† of¬† circuit¬† diagram¬† explain¬† the working Of Full Wave Bridge Type Rectifier. Also Prove the efficiency is 81.2‚Äį.
  2. ¬†Explain the input and output characteristics of CE Configuration? Also derive the Relation between őĪ and ő≤.
  3. Write a note on
  • N-type Semiconductor
  • Voltage Divider Biasing Circuit
  • Drift and Diffusion Current
  1. Explain Conductors, Insulators and Semiconductors on the basis their energy band diagrams.

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BASIC ELECTRONICS DIPLOMA MAY 2015 PAPER

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