Solved question paper for BE May-2017 (DIPLOMA electronics and communication engineering 1st-2nd)

Basic electronics

Previous year question paper with solutions for Basic electronics May-2017

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Question paper 1

  1. SECTION A

    Q.1 Fill in the blanks:

    a. N-type semiconductors are formed by adding __________ impurity to a pure semiconductor.

    Answer:

  2. b. In Intrinsic semiconductors number of electrons are___________ to number of protons.

    Answer:

  3. c. Conduction in P-type semiconductor is due to movement of ___________

    Answer:

  4. d. The value of knee voltage for silicon diode is __________ volt.

    Answer:

  5. e. A Photodiode is optimised for its sensitivity to ___________ .

    Answer:

  6. f. Zener diode is made to operate in ___________ region.

    Answer:

  7. g. A transistor contains __________ PN junctions.

    Answer:

  8. h. The emitter of a transistor is doped ___________.

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  9. i. The value of collector current of a transistor is __________ to emitter current.

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  10. j. In transistor, leakage current mainly depends on _________.

    Answer:

  11. k. The ideal value of stability factor is ____________.

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  12. l. The gain stability of an amplifier circuit can be improved by using __________ feedback.

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  13. m. For a transistor to work as an amplifier, its operating point should lie in __________ region.

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  14. n. FET is a __________ terminal semiconductor device.

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  15. o. MOSFET stands for __________.

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  16. SECTION-B

    Q.2. Attempt any five Questions.


    a. How N-type semiconductor is formed?

    Answer:

  17. b. What are intrinsic and extrinsic semiconductors?

    Answer:

  18. c. Write a note on PN junction.

    Answer:

  19. d. What is Zener diode? Draw its symbol and explain its characteristics.

    Answer:

  20. e. What is transistor? Draw and explain PNP transistor.

    Answer:

  21. f. Differentiate between FET and BJT.

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  22. g. What do you mean by thermal runaway?

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  23. SECTION – C

    Note: Attempt any three questions.

    Q3. What are needs of filter? Explain π (Pi) filter in detail.

    Answer:

  24. Q4. Derive an expression for amplification factor (β) of common emitter configuration.

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  25. Q5. What is CMOS? Explain its advantages and application.

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  26. Q6. Explain the concept of bipolar transistor and draw symbol of NPN and PNP transistors.

    Answer: