Solved question paper for BE May-2016 (DIPLOMA electronics and communication engineering 1st-2nd)

Basic electronics

Previous year question paper with solutions for Basic electronics May-2016

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Question paper 1

  1. SECTION A

    Q.1. Attempt all:

    a) At absolute zero temperature, the conduction band of a semiconductor is totally_____________.

    Answer:

  2. b) To obtain p-type semiconductor, _________impurity is added to a pure semiconductor.

    Answer:

  3. c) The value of knee voltage for germanium diode is _________volt.

    Answer:

  4. d) The maximum value of rectification efficiency of full wave rectifier can be_________%.

    Answer:

  5. e) Usually, a zener diode is used as a______________.

    Answer:

  6. f) The material used for the construction of LED is __________.

    Answer:

  7. g) In a transistor, there are _____________ pn junctions.

    Answer:

  8. h) A transistor is usually applied for____________.

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  9. i) The method by which the operating point is made independent of temperature variations or variations of transistor parameters (ߚ (is called_____________.

    Answer:

  10. j) For a good voltage amplifier, its input impedance should be_________as compared to the source impedance.

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  11. k) A FET is also called as______ polar transistor.

    Answer:

  12. l) Filter circuits are used to reduce________.

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  13. m) PIV stands for_____________.

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  14. n) A capacitor circuit does not allow to pass ________ component.

    Answer:

  15. o) Define Drift Current

    Answer:

  16. SECTION B

    Q.2. Attempt any SIX Questions:

    a) Explain with suitable diagram Intrinsic and Extrinsic semiconductors.

    Answer:

  17. b) Draw the block diagram of a power supply. Explain in brief the functioning of each block.

    Answer:

  18. c) Explain how a zener diode maintains constant voltage across the load.

    Answer:

  19. d) Explain the working of npn transistor.

    Answer:

  20. e) Describe the potential divider circuit in detail.

    Answer:

  21. f) In what way the temperature variations affect the operating point of a transistor?

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  22. g) Explain the working principle of a FET?

    Answer:

  23. h) Explain working of shunt capacitor filter.

    Answer:

  24. SECTION C

    Note: Attempt any THREE

    Q. 3. With the help of circuit diagram explain the working of Full Wave Bridge Type Rectifier.

    Answer:

  25. Q. 4.Explain the input and output characteristics of CE Configuration? Also derive the relation between α and β.

    Answer:

  26. Q. 5. Explain Conductors, Insulators and Semiconductors on the basis their energy band diagrams.

    Answer:

  27. Q. 6. Write a short note on

    a) V-I characteristics of a diode

    b) Atomic structure of Germanium atom

    Answer: