I sem B.Sc. Examination, Oct/November 2009
(Semester Scheme) (O.S.)
ELECTRONICS (Paper - I)
Electronics Fundamentals
Time : 3 Hours Max. Marks : 60
Instruction : Answer any five questions from Part-A, four questions from Part-B and any five questions from Part-C.
PART - A
Answer any five of the following : (5x6=30)
1. a) Explain the construction of an electrolytic capacitor.
b) Define the voltage and current of an ideal transformer. Mention the application of transformer.
2. a) Draw the schematic diagram of a CRT and briefly explain its working.
b) What is an ideal current source?
3. a) Derive an expression for the voltage across a capacitor at any instant of time during charging in a series RC circuit excited by a dc voltage source. Represent it graphically. Define its time constant.
4. Derive an expression for the current, impedance and phase angle of an RL circuit excited by an ac source.
5. a) Define the terms rms value of an ac voltage.
b) Derive an expression for the resonant frequency of a series RLC circuit excited by an source. Draw the resonant curve.
6. a) Define the terms linear and bilateral network.
7. State Thevenin's theorem. Explain the steps involved in Thevenising the given resistive network.
8. a) Distinguish between n-type and p-type semiconductor.
b) Explain the behaviour of aPn junction under forward and reserve bias conditions. Draw its V-I characteristics.
(Semester Scheme) (O.S.)
ELECTRONICS (Paper - I)
Electronics Fundamentals
Time : 3 Hours Max. Marks : 60
Instruction : Answer any five questions from Part-A, four questions from Part-B and any five questions from Part-C.
PART - A
Answer any five of the following : (5x6=30)
1. a) Explain the construction of an electrolytic capacitor.
b) Define the voltage and current of an ideal transformer. Mention the application of transformer.
2. a) Draw the schematic diagram of a CRT and briefly explain its working.
b) What is an ideal current source?
3. a) Derive an expression for the voltage across a capacitor at any instant of time during charging in a series RC circuit excited by a dc voltage source. Represent it graphically. Define its time constant.
4. Derive an expression for the current, impedance and phase angle of an RL circuit excited by an ac source.
5. a) Define the terms rms value of an ac voltage.
b) Derive an expression for the resonant frequency of a series RLC circuit excited by an source. Draw the resonant curve.
6. a) Define the terms linear and bilateral network.
7. State Thevenin's theorem. Explain the steps involved in Thevenising the given resistive network.
8. a) Distinguish between n-type and p-type semiconductor.
b) Explain the behaviour of aPn junction under forward and reserve bias conditions. Draw its V-I characteristics.
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