ASSIGNMENTS OF MODULE-1
ASSIGNMENTS DISCUSSION (BE REMEDIAL CLASSES)
BASIC ELECTRONICS SHORT QUESTIONSQ. 1-Define mobility and
conductivity of an intrinsic semiconductor.
2- Distinguish between avalanche and Zener break down.
3-Distinguish metals from semiconductors with reference to fermi
level.
4-Why FET is called unipolar transistor? What is the term field
effect?
5-Derive an expression for amplification factor of FET.
6-How Zener diode is used in a voltage regulator? 7-What is the
difference between analog and digital signals?
8-Define CMRR and Slew rate of OPAMP.
9-Draw the equivalent circuit of an ideal OP-AMP. Mention two
applications
of OPAMP.
10-An amplifier has a voltage gain of 100 V/V and a current gain
of 1000 A/A.
Express the voltage and current gains in decibel and find the
power gain.
11-Find the output power of an amp lifer, if the power gain of
amplifier is 20dB and
the input power of the amplifier is 25 mW.
12-For a reverse biased diode, does the transition region
increase or decrease in
width? Explain.
13-Show the voltage follower circuit using a J-FET.
14-How current flows in a semiconductor is different from that
of a metal? 15-Define peak reverse voltage.
16-Sketch the JFET drain characteristics with VGS=0. Show ohmic
and pitch-off
regions. 17-What are the ideal characteristics of an OPAMP?
18-Define the slew rate and CMRR.
19-Mention three applications of OPAMP.
20-What is the difference between analog vs digital signals.
Define bandwidth. 21-Draw the schematic symbol of an operational
amplifier indicating the various
terminals. 22-What is ripple factor ? What is the value for a
half-wave and full-wave rectifier? 23-Draw and explain the V-I
characteristics of a PN junction.
24-Define a mathematical tool to find out the frequency spectrum
of a signal.
25. Calculate the intrinsic carrier density ni for silicon at
T=50 K.
26. Consider an n-type silicon for which the dopant
concentration ND=1017/cm3.Find
the electron and hole concentrations at T=300 K. 27.
Differentiate between drift current and diffusion current.
28. Write the Einstein relationship related to mobility of
charge carriers.
29.Define junction built-in voltage of pn-junction.
30.Define the mean transit time of the junction.
31.Draw the piecewise-linear model of the diode forward
characteristic. 32. Draw the circuit diagram of half-wave
rectifier,full-wave rectifiers and the Peak
rectifier.
33. Differentiate between Clipper and Clamper circuit.
34. Draw a circuit diagram for a Voltage Doubler.
35. Write different uses of photodiodes and LEDs.
36.Write the different BJT modes of operation.
37.Sketch the Ebers-Moll(EM) model of the npn transistor.
38. Transistos of a certain type are specified to have values in
the range 50 to 150.Find
the range of their values.
39. How BJT acts as an Amplifier?40. How BJT acts as a Switch
?
41. Distinguish between AC load line and DC load line.42. Derive
the expression for collector current for a CE transistor.
43.Explain with suitable diagrams the difference between self
bias and fixed bias.
44.Why biasing is done in in a Bipolar Junction Transistor ?
45.What is meant by small signal analysis of transistor ?
46.What is load line ? How it is used to calculate the operating
point ?
47.Define the term hie,hfe,hoe and hre of a transistor.48.What
is a clamber circuit ? Draw the circuit diagram of a positive
clamper showing their output waveforms.
49.DefineOver Drive Factor and write its significance.
50.Draw the output characteristics of CE configuration showing
different operating regions along with necessary conditions.
51.Write down the application of CRO.52.What is Lissajous
patterns in a CRO ?
53.What are functions of sweep trigger and sweep generator in
CRO ?
54.Determine the number of cycles of 1 KHz sinusoidal signal as
viewed on an oscilloscope when the sweep frequencies are 2 KHz and
500 Hz.
55.How a waveform is displayed in a Cathode Ray Oscilloscope
?
56.A Lissajous pattern on a CRO has 4 horizontal tangencies and
vertical tangencies. The frequency of horizontal input is 1
KHz.What is the frequency of the vertical input ?57.Write down the
advantages of a negative feedback amplifier.
58.Why voltage series feedback is most commonly used in
amplifiers ?
59.What is Barkhausen criterion ?
60.Compare the advantages and disadvanges between cetre-tapped
and bridge type full-wave rectifier.
61.Compare static-RAM and dynamic-RAM with respect to their
speed, volume of data storage, size and cost.62.What is
piezoelectric effect ? Write the use of crystal oscillator.
63.What do you mean by diffusivity and mobility of holes. ?
64. Draw the transfer characteristics of an Inverter and also
define Noise Margin.
65. Draw the circuit diagram of a voltage follower and also
write its two application.
66. Write the effect of temperature on semiconductor materials.
Explain through related equation if any.
67. Draw the circuit of a double ended clipper using ideal p-n
diodes which limits the outputs from +3 V to -3V for sinusoidal
input of amplitude 5V.68. Draw the simplified hybrid- model of BJT
amplifier.
69. Voltage gain of an amplifier without feedback is 60 dB. It
increases to 40 dB with feedback. Calculate the feedback
factor.
70. State the function of attenuator in CRO.
71. Find the percentage increase in reverse saturation current
of a PN junction diode if the temperature is increased from 250 C
to 500 C ?
72. A signal is represented by y=5 sin(628t+30).find the
frequency, amplitude and initial phase of the signal?
73.Binary number system is used in digital electronic
cicuits.Why octal,decimal or hexadecimal number systems are not
used in circuit levels.74. Prove that
75.Design using basic gates only.
76.Simplify the Boolean expression .
77. ( i) convert (275.625)10 = ( )2 (ii) Subtract 11101 from
1101 using complement method.
78.What is universal gate? Why the name is so? Justify your
answer through example
79. Perform the subtraction using complement
i) 2977-7992 ii) 11011-11001
80. Define duty cycle of a pulse waveform.
81. A basic 2-input logic circuit has a HIGH on one input and a
LOW on the other input,
and the output is HIGH. What type of logic circuit is it? 82.
What weight does the digit 7 in the number 58.72?
83. What is the largest decimal number that can be represented
in binary with eight bits?
84. Convert the decimal number 45.5 to binary by using the
sum-of-weight method.
85. Express the decimal number -39 as an 8-bit in the
sign-magnitude,1s complement, and 2s complement forms.
86.Convert the decimal number 3.248104 to a single-precision
floating-point binary
number.
87. Divide 01100100 by 00011001.
88.Convert the hexadecimal number B2F816 to decimal.
89.Convert the octal number 23788 to decimal.90. Implement EXOR
operation using minimum no. of 2 i/p NAND gate only.
91. Implement EX-NOR operation using minimum no. of 2 i/p NAND
gate only.
92. Implement EXOR operation using minimum no. of 2 i/p NOR gate
only.
93. Implement EX-NOR operation using minimum no. of 2 i/p NOR
gate only.
94. Draw the truth table of a Full Adder circuit. 95. Draw the
truth table of a Full Subtractor circuit.96. Determine the values
of A, B,C and D that make the sum term equal to 0.97. State
DeMorgans theorems.
98. Convert the Boolean expression into standard SOP form.
99.Convert the Boolean expression into
standard POS form.
100.List three types of latches and explain the operation of the
latches.
LONG QUESTIONS
1. (i) Find the closed loop voltage gain for an OP-AMP that can
be used when the
input signal varies by 0.5v in 10 ms , having a Slew rate of SR=
2V/s ?
(ii) Derive an expression for the voltage gain of a closed loop
non-inverting amplifier
(consider that it is an ideal OP-AMP).
2. An amplifier operating from 3 V supplies provides a 2.2 V
peak sine wave
across a 100- load when provided with a 0.2- V peak input from
which 1.0 mA
peak is drawn. The average current in each supply is measured to
be 20 mA.Find
voltage gain, current gain and power gain expressed as in dB.
Find the supply power
and amplifier efficiency.
3. Draw the frequency spectrum of the periodic square wave
having period T,
given below
V (t) = -V, -T/2
