Basic electronics
Previous year question paper with solutions for Basic electronics May-2017
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Question paper 1
SECTION A
Q.1 Fill in the blanks:
a. N-type semiconductors are formed by adding __________ impurity to a pure semiconductor.
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b. In Intrinsic semiconductors number of electrons are___________ to number of protons.
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c. Conduction in P-type semiconductor is due to movement of ___________
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d. The value of knee voltage for silicon diode is __________ volt.
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e. A Photodiode is optimised for its sensitivity to ___________ .
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f. Zener diode is made to operate in ___________ region.
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g. A transistor contains __________ PN junctions.
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h. The emitter of a transistor is doped ___________.
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i. The value of collector current of a transistor is __________ to emitter current.
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j. In transistor, leakage current mainly depends on _________.
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k. The ideal value of stability factor is ____________.
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l. The gain stability of an amplifier circuit can be improved by using __________ feedback.
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m. For a transistor to work as an amplifier, its operating point should lie in __________ region.
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n. FET is a __________ terminal semiconductor device.
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o. MOSFET stands for __________.
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SECTION-B
Q.2. Attempt any five Questions.
a. How N-type semiconductor is formed?Answer:
b. What are intrinsic and extrinsic semiconductors?
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c. Write a note on PN junction.
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d. What is Zener diode? Draw its symbol and explain its characteristics.
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e. What is transistor? Draw and explain PNP transistor.
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f. Differentiate between FET and BJT.
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g. What do you mean by thermal runaway?
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SECTION – C
Note: Attempt any three questions.
Q3. What are needs of filter? Explain π (Pi) filter in detail.
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Q4. Derive an expression for amplification factor (β) of common emitter configuration.
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Q5. What is CMOS? Explain its advantages and application.
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Q6. Explain the concept of bipolar transistor and draw symbol of NPN and PNP transistors.
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