Basic electronics
Previous year question paper with solutions for Basic electronics May-2016
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Question paper 1
SECTION A
Q.1. Attempt all:
a) At absolute zero temperature, the conduction band of a semiconductor is totally_____________.
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b) To obtain p-type semiconductor, _________impurity is added to a pure semiconductor.
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c) The value of knee voltage for germanium diode is _________volt.
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d) The maximum value of rectification efficiency of full wave rectifier can be_________%.
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e) Usually, a zener diode is used as a______________.
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f) The material used for the construction of LED is __________.
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g) In a transistor, there are _____________ pn junctions.
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h) A transistor is usually applied for____________.
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i) The method by which the operating point is made independent of temperature variations or variations of transistor parameters (ߚ (is called_____________.
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j) For a good voltage amplifier, its input impedance should be_________as compared to the source impedance.
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k) A FET is also called as______ polar transistor.
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l) Filter circuits are used to reduce________.
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m) PIV stands for_____________.
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n) A capacitor circuit does not allow to pass ________ component.
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o) Define Drift Current
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SECTION B
Q.2. Attempt any SIX Questions:
a) Explain with suitable diagram Intrinsic and Extrinsic semiconductors.
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b) Draw the block diagram of a power supply. Explain in brief the functioning of each block.
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c) Explain how a zener diode maintains constant voltage across the load.
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d) Explain the working of npn transistor.
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e) Describe the potential divider circuit in detail.
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f) In what way the temperature variations affect the operating point of a transistor?
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g) Explain the working principle of a FET?
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h) Explain working of shunt capacitor filter.
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SECTION C
Note: Attempt any THREE
Q. 3. With the help of circuit diagram explain the working of Full Wave Bridge Type Rectifier.
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Q. 4.Explain the input and output characteristics of CE Configuration? Also derive the relation between α and β.
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Q. 5. Explain Conductors, Insulators and Semiconductors on the basis their energy band diagrams.
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Q. 6. Write a short note on
a) V-I characteristics of a diode
b) Atomic structure of Germanium atom
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