Printed Pages: 7
REC-101
(Following Paper ID and Roll No. to be filled in your Answer Books)
--- Content provided by FirstRanker.com ---
Paper ID: 2012295
Roll No.
B.TECH.
Regular Theory Examination (Odd Sem - I), 2016-17
BASIC ELECTRONICS.
--- Content provided by FirstRanker.com ---
Paper-I
Time: 3 Hours
Max. Marks: 100
Section - A
Attempt all parts. All parts carry equal marks. Write answer of each part in short.
--- Content provided by FirstRanker.com ---
(10×2=20)
-
a) Distinguish between avalanche and zener breakdown.
-
b) Calculate the dynamic forward resistance of pn junction diode when applied voltage is 0.80 V at temperature of 43 degree Celsius and reverse saturation current is 8 microampere?
REC-101
--- Content provided by FirstRanker.com ---
-
c) Explain the principle of operation of LED.
-
d) Derive the relationship between a and ß.
-
e) The thickness of base is typically smaller than emitter and collector. Why?
-
f) Explain FET as voltage variable resistor.
-
g) An operation amplifier has differential gain of 102 and CMRR of 80 dB, input voltage are 100 microampere and 60 microampere. Determine output voltage.
--- Content provided by FirstRanker.com ---
-
h) Write the characteristics of an ideal Op-Amp.
-
i) State the advantages of digital instruments over analog instruments.
-
j) Give advantages of FM over AM?
--- Content provided by FirstRanker.com ---
--- Content provided by FirstRanker.com ---
REC-101
Section - B
Attempt any five questions from this section (5×10=50)
--- Content provided by FirstRanker.com ---
-
a) Explain the V-I characteristic of p-n junction diode. Draw well labelled characteristic.
-
b) Draw the circuit and discuss the working of full wave bridge rectifier with suitable input-output waveform.
-
3. a) For the given clamper circuit shown in figure below determine the output voltage and also draw the waveform of output signal.
--- Content provided by FirstRanker.com ---
VI
+10
-15
C
+
--- Content provided by FirstRanker.com ---
?
0
VI
Vo
Si
--- Content provided by FirstRanker.com ---
5V
R
?
-
b) Explain the V-I characteristic of tunnel diode.
--- Content provided by FirstRanker.com ---
-
4. a) Draw the circuit diagram of BJT in CE configuration. Draw output characteristic curves and indicate the different regions of operation.
REC-101
-
b) An n-p-n transistor with ß = 98 is operated in the CB configuration, if the emitter current is 2 mA and reverse saturation current is 12 µ?. What are the base and collector current?
--- Content provided by FirstRanker.com ---
-
a) Why is transistor biasing required? Describe collector to base biasing in CE n-p-n transistor circuit.
-
b) Explain various current components in npn transistor with help of suitable diagram.
-
9.
-
10. a)
REC-101
-
b) Explain the basic principle of a digital multimeter.
-
Define Amplitude modulation. Derive the expression for AM modulated waveform. Define modulation index of AM.
--- Content provided by FirstRanker.com ---
--- Content provided by FirstRanker.com ---
Section - C
--- Content provided by FirstRanker.com ---
Attempt any two questions from this section (2×15=30)
-
For the circuit shown in figure below determine I1, I2, I3, I4, Vo.
11, 12, 13, 14, Vo.
I1
I2
--- Content provided by FirstRanker.com ---
+
I3
+
Si
10V
--- Content provided by FirstRanker.com ---
Si
6 ?O ?
?
8 ?O
I4
--- Content provided by FirstRanker.com ---
-
b) Draw and discuss voltage tripler circuit.
-
8. a) Explain how unknown signal frequency is measured using CRO.
-
c) Explain principle of operation of LCD.
REC-101
-
11. a) Discuss AC equivalent model of voltage divider biased amplifier in CE configuration.
-
b) For the circuit shown below determine VB, IC, V. Given that ß = 80, VRE = 0.7 V.
BE
V = 8sin(6 x 108 + 3sin 2000t)
Calculate:
--- Content provided by FirstRanker.com ---
9+Vee=20 V
R1=20 K
Rc = 2 K
VB
R2=5 K
--- Content provided by FirstRanker.com ---
RE 1 K
-
c) Explain the formation of depletion region in JFET.
-
12. a) Draw and derive relationship for Op-Amp as closed loop non-inverting amplifier circuit.
--- Content provided by FirstRanker.com ---
-
b) A 500 W carrier is modulated to a depth of 60%. Calculate the total power in amplitude modulated wave.
-
c) If a FM wave is represented by the equation :
-
i) Carrier frequency
--- Content provided by FirstRanker.com ---
-
ii) Modulating frequency
-
iii) Modulation index.
--- Content provided by FirstRanker.com ---
-
--- Content provided by FirstRanker.com ---
--- Content provided by FirstRanker.com ---
--- Content provided by FirstRanker.com ---
This download link is referred from the post: AKTU B-Tech Last 10 Years 2010-2020 Previous Question Papers || Dr. A.P.J. Abdul Kalam Technical University