[EURCS 301 / EURIT 301]
B.Tech. DEGREE EXAMINATION
CSE & IT
III SEMESTER
BASIC ELECTRONICS
(Effective from the admitted batch 2008–09 onwards)
Time: 3 Hours Max.Marks: 60
-----------------------------------------------------------------------------------
Instructions: Each Unit carries 12 marks.
Answer all units choosing one question from each unit.
All parts of the unit must be answered in one place only.
Figures in the right hand margin indicate marks allotted.
-----------------------------------------------------------------------------------
UNIT-I
1. a) Explain the term Diffusion. Derive an expression for diffusion
hole-current density. 6
b) Define regulation. Derive the regulation equation for a
full-wave circuit. 6
OR
2. a) Explain the current components in a p-n diode. 6
b) Explain piece wise linear characteristics of a diode. 6
UNIT-II
3. a) Draw the circuit symbol for a pnp transistor and indicate the
reference directions for currents and voltages. 6
b) Draw the circuit for self bios. How this circuit is improvement
over fixed bias circuit. 6
OR
4. a) Discuss thermal instability. 6
b) Why is capacitive coupling is used to connect a signal source
to an amplifier. 6
UNIT-III
5. a) Explain the terms large-signal current gainb and DC current
gain lFE 6
b) Draw the approximate hybrid model for CE amplifier. Obtain
expressions for current gain. 6
OR
6. a) Draw the circuit for CB configuration. Explain the input and
output characteristics. 6
b) Draw the approximate hybrid model for CE amplifier. 6
UNIT-IV
7. a) Explain the characteristics of JFET. 6
b) Define the parameters of FET. Obtain the relation among them. 6
OR
8. a) Explain the pinch-off voltage. 6
b) Draw the high frequency model for FET. 6
UNIT-V
9. a) Explain the effect of negative feedback on the bandwidth and
distortion in an amplifier. 6
b) Draw the circuit for RC phase shift oscillator. Write the
expression for the frequency of oscillation. 6
OR
10. a) Explain current-series feedback amplifier. 6
b) Explain briefly about crystal oscillators. 6
[03-07/IIIS/109]
[EURCS 301 / EURIT 301]
B.Tech. DEGREE EXAMINATION
CSE & IT
III SEMESTER
BASIC ELECTRONICS
(Effective from the admitted batch 2008–09 onwards)
Time: 3 Hours Max.Marks: 60
-----------------------------------------------------------------------------------
Instructions: Each Unit carries 12 marks.
Answer all units choosing one question from each unit.
All parts of the unit must be answered in one place only.
Figures in the right hand margin indicate marks allotted.
-----------------------------------------------------------------------------------
UNIT-I
1. a) Explain the term Diffusion. Derive an expression for diffusion
hole-current density. 6
b) Define regulation. Derive the regulation equation for a
full-wave circuit. 6
OR
2. a) Explain the current components in a p-n diode. 6
b) Explain piece wise linear characteristics of a diode. 6
UNIT-II
3. a) Draw the circuit symbol for a pnp transistor and indicate the
reference directions for currents and voltages. 6
b) Draw the circuit for self bios. How this circuit is improvement
over fixed bias circuit. 6
OR
4. a) Discuss thermal instability. 6
b) Why is capacitive coupling is used to connect a signal source
to an amplifier. 6
UNIT-III
5. a) Explain the terms large-signal current gainb and DC current
gain lFE 6
b) Draw the approximate hybrid model for CE amplifier. Obtain
expressions for current gain. 6
OR
6. a) Draw the circuit for CB configuration. Explain the input and
output characteristics. 6
b) Draw the approximate hybrid model for CE amplifier. 6
UNIT-IV
7. a) Explain the characteristics of JFET. 6
b) Define the parameters of FET. Obtain the relation among them. 6
OR
8. a) Explain the pinch-off voltage. 6
b) Draw the high frequency model for FET. 6
UNIT-V
9. a) Explain the effect of negative feedback on the bandwidth and
distortion in an amplifier. 6
b) Draw the circuit for RC phase shift oscillator. Write the
expression for the frequency of oscillation. 6
OR
10. a) Explain current-series feedback amplifier. 6
b) Explain briefly about crystal oscillators. 6
[03-07/IIIS/109]
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