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Basic Electronics 2nd Sem ECE/EEE/CSE/2661 May 2016

Basic electronics

Basic Electronics 2nd Sem Exam ECE/ECE/CSE/0664/2661 May 2016

       Basic Electronics 2nd Sem EEE/ECE/CSE/0664/2661 May 2016                                                                                                                                                                                                SECTION-A

Q1. Do as directed.                                                                             15×1=15

  1. At absolute zero temperature, the conduction band of a semiconductor is totally Empty.
  2. To obtain p-type Semiconductor, Trivalent impurity is added to a pure Semiconductor.
  3. The value of knee voltage for germanium diode is 0.3 V
  4. Maximum value of rectification efficiency of full wave rectifier can be 81.2%.
  5. Usually, a Zener diode is used as a Voltage Regulator.
  6. Material used for the construction of LED is GaAsP .
  7. In a transistor, there are Two PN Junction.
  8. A transistor is usually applied for Amplifier
  9. The method by which the operating point is made independent of temperature variations or variations of transistor parameters (þ) is called Stabilization of  Operating Point.
  10. For a good voltage amplifier, its input impedance should be High.
  11. A FET is also called as  Unipolar Device .
  12. Filter circuits are used to reduce ac Component.
  13. PIV stands for Peak Inverse Voltage.
  14. A capacitor circuit does not allow to pass dc components.
  15. Define Drift.

                                      SECTION-B

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

  1. Explain with suitable diagram Intrinsic and Extrinsic Semiconductor.
  2. Draw the block diagram of a power supply. Explain in brief the functioning of each
  3. Explain how a Zener diode maintains constant voltage across the load.
  4. Explain the working of npn transistor.
  5. Describe the potential divider circuit in Details.
  6. In what way the temperature variations affect the operating point of a transistor?
  7. Explain the working principle of a FET?
  8. Explain working of shunt capacitor 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.
  2. Explain the input and output characteristics of CE Configuration? Also derive the relation between α and β.
  3. Explain Conductors, Insulators and Semiconductors on the basis their energy band diagrams.
  4. Write a short note on (a) V-I characteristics of a diode    (b) Atomic structure of Germanium atom

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