Subject – Semester Examination – Nov/Dec-2019
Branch: B. E. (Electronics & Telecommunication Engineering-CBCGS)-Sem-3
Subject (Subject Code): Electronic Devices & Circuits-1 (51202)
Time: 3 Hrs
Instructions to the Students :
- Question no. 1 is compulsory.
- Solve any three questions from the remaining 5.
- Use of non-programmable scientific calculators is allowed.
- Assume suitable data wherever necessary & mention it clearly.
Q.1. Attempt any 4 (20).
a) Explain various types of Resistors.
b) Give the equation for the current in semiconductor diode. With the help of this equation explain in detail the V-I characteristics of a semiconductor diode.
c) Explain Zener as a Voltage Regulator.
d) Find values of RB & RC:
e) Compare BJT CE Amplifier & JFET CS Amplifier.
f) Draw & explain the high-frequency model of BJT for CE configuration.
a) Design a single-stage CE Amplifier suitable for low frequencies of 10HZ to give voltage gain Av 70 & the output voltage of 4.5V; employing transistor type BC147A. Calculated the expected Av & the maximum output voltage with negligible distortion that can be obtained from the designed circuit. Also, calculate the input resistance of the amplifier. Specify clearly the supply voltage Vcc for the designed circuit.