Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER • EXAMINATION Winter 2017 Subject Code: X11101 Date:01/01/2018 Subject Name: Basic Electronics Time:10:30 AM TO 01:00 PM Total Marks: 70 Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

Define: Covalent bonds, Electric field, Potential, Photo ionization, Drift current, Mean life time, PIV of diode
07

Explain the Hall Effect, state its application and derive VH and RH
07
Q.2

Differentiate
Zener break down and Avalanch breakdown
Ge diode and Si diode
07

Derive the expression for Transition Capacitance.
07
OR

In a Center tapped full wave rectifier the rms half secondary voltage is 10 v. Assuming ideal diodes and RL=1kΩ. Find 1)Peak current 2)DC load voltage 3)RMS current 4)Ripple factor 5)Efficiency
07
Q.3

Draw and explain Bridge Rectifier with its waveforms.
07

Give comparison of CE, CB, and CC configuration of transistor.
07
OR
Q.3

State differences between Clippers and Clampers. Explain negative clamper with its waveform.
07

Explain the Tunneling phenomenon and the V-I characteristics of a Tunnel diode.
07
Q.4

Explain the working of Push pull amplifier.
07

Write short notes on Varacter Diode and Emitter follower.
07
OR
Q.4

Determine the h parameter for the two port network. Also draw the hybrid model for CE, CB and CC configuration.
07

Comparison between Current controlled device and Voltage controlled device.
07
Q.5

State the different biasing methods for transistor and explain the basic load line and Q point for any transistor configuration.
07

Explain in brief V-I characteristic of JFET and also state Pinch off condition.
07
OR
Q.5

What is the need of Regulator? Explain the series voltage regulator.
07

Write short note on Thermistor and Photo transistor.
07

1