M.Sc. (Semester (CBCS) Examination Nov/Dec-2018
Physics (Material Sciences)
ANALOG DIGITAL ELECTRONICS
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
All questions carry equal marks.
Q.1 Multiple choice questions. 14
An ideal differential amplifier if same signal is given to both the inputs then
output will be
same as input double the input
not equal to zero zero
In common mode differential amplifier
both inputs are grounded
the output s are connected together
an identical signal appears on both inputs
the output signal are in phase
A certain non-inverting amplifier has Ri of 1K Ohms and Rf of 100K Ohms.
The closed loop voltage gain
10000 1000
101 100
An op-amp can amplify
ac signals only dc signals only
both ac and dc signals neither dc nor ac signals
As the frequency increases input impedance of differentiator
increases decreases
remains constant none of the above
Which amount following is/are the requirements of an instrumentation
amplifier
high slew rate high input resistance
high CMRR all the above
An oscillator employs which feedback
positive negative
neither positive or negative data is in sufficient
In phase shift oscillator the frequency determining element are
L and C L and C
R and C none of the above
An oscillator differs from an amplifier because it,
has more gain requires no input signal
requires no dc supply always has the same input
10) Astable multivibrator circuit acts as/an
amplifier oscillator
relaxation oscillator multiplexer
Page 2 of 2
SLR-VN-378
11) How many AND gates are required to realize Y CD EF G
4 5
3 2
12) The NOR gate output will be high if the two outputs are
00 01
10 11
13) What is SIM?
Select interrupt mask Sorting interrupt mask
Set interrupt mask None of these
14) The clock speed of 8085 is
1 MHz 1 KHz
3.2 KHz 3.2 MHz
Q.2 Attempt the following (any Four) 08
Draw the neat label diagram for dual input balanced output differential
amplifier.
Define open loop and closed loop gain of an amplifier.
What do you mean by comparator? Draw the circuit of comparator.
What is NOR gate? Write its logic diagram and truth table.
Define decoder and encoder. Mention their two applications.
Write note on (Any Two) 06
Latch and flip flop
Comparator
Types of oscillators
Q.3 Answer the following (Any Two) 08
Mention the ideal characteristics of op-amp
State and prove De Morgans theorem and draw logic diagram.
With logic diagram and truth table explain RS flip flop.
Answer the following (Any One) 06
Derive an expression of output voltage of summing amplifier.
With circuit diagram explain the working of monostable multivibrator.
Q.4 Answer the following (Any Two) 10
Derive an expression for input resistance and bandwidth with feedback in
a closed loop amplifier.
The time period of Wein bridge oscillator is 1mS, calculate the value of
given C=0.01μF. R1=R2=R and C1=C2=C.
Explain the addressing modes of 8085.
Answer the following (Any One) 04
Derive an expression for output voltage of op-amp as an integrator and
draw the output wave forms for different input signals.
With a neat circuit diagram explain the working of triangular wave
generator.
Q.5 Answer the following (Any Two) 14
With a neat block diagram explain the architecture of 8085.
With circuit diagram explain the working of SISO shift register.
With a neat circuit diagram explain the working of Wein bridge oscillator.