M.Sc. (Physics-Material Science) (Semester
(CBCS) Examination, 2017
ANALOG DIGITAL ELECTRONICS
Day Date: Saturday, 22-04-2017 Max. Marks: 70
Time: 10.30 AM to 01.00 PM
N.B. Q. are compulsory.
Answer any three questions from Q.3 to Q.7.
All questions carry equal marks.
Q.1 Objectives questions. 14
Select correct alternatives. 08
1g) The output stage of an op-amp usually a
Complementary emitter follower.
Transformer coupled class B amplifier.
Class A power amplifier.
Class B amplifier.
2 The 'slew rate' of an operational amplifier indicates
How fast its output current can change
How fast its output impedance can change
How fast its output power can change
How fast its output voltage can change
3 A phase shift oscillator
LC tuning
Piezoelectric crystal
Balanced bridge
Variable frequency operation
4 The three variable Boolean expression

It is required to construct to count upto 100(decimal). The
minimum number of flipflops to construct the counter is
8 7 6 5
6 8085 microprocessor carryout the subtraction by
ABCD subtraction method
Hexadecimal subtraction method
complement method
Floating point subtraction method
Page 2 of 2
Select correct alternatives. 08
An Op-amp as a voltage follower has a voltage gain of Unity.
(True/False)
For generating 1 kHz signal, the most suitable circuit is Wien
bridge oscillator. (True/False)
A one-to-sixteen demultiplexer requires 4 select input lines.
(True/False)
An instruction cycle is made up of machine cycles and a
machine cycle is made up of number of states. (True/False)
Current through a virtual ground is
A phase shift oscillator
A one-to-sixteen demultiplexer requires input lines.
A _____development system and an essential tools
for writing large assembly language programs.
Q.2 Write short notes. 14
Discuss the terminal properties of an ideal operational amplifier. 05
Explain how an S-R flip-flop can be converted into a J-K-flip-flop. 05
Write briefly on instrumentation amplifier. 04
Q.3 Draw the block schematic of a typical operational amplifier and
briefly explain the function of each block. Also give the equivalent
circuit of the op-amp.
08
With a neat circuit diagram derive an equation for the closed loop
gain of an operational amplifier.
06
Q.4 Draw the circuit of Practical Differentiator and derive expression for
its output voltage.
08
Define the following for an OPAMP
Input bias current
Input offset voltage
06
Briefly describe how the input offset voltage can be measured.
Q.5 What is meant by a voltage regulator? Draw the block diagram of a
regulated power supply and explain the function of its various
components.
08
Realize a non-inverting summer using OPAMP. 06
Q.6 What is a decoder? Draw the logic circuit of a 3 line to 8 line
decoder and explain its working.
08
With relevant diagram explain the working of master-slave JK Flip-
Flop.
06
Q.7 Draw the internal architecture of 8085 and explain various
functional blocks.
08
Write a program to find the largest number in an array of data using
8085 instruction set.