BEC303

Model Question Paper-I with effect from 2023-24 (CBCS Scheme)

USN

Third Semester B.E. Degree Examination

Electronic Principles and circuits
TIME: 03 Hours Max. Marks: 100

Note: 01. Answer any FIVE full questions, choosing at least ONE question from each MODULE.

Bloom’s
Q.No Question Marks
Level
MODULE-1
1 a. Develop an expression for the operating point IC and VCE for the voltage 10 L3
divider bias circuit using approximate analysis. Also Calculate the
operation point for the VDB circuit given Vcc=10V, R1=10KΩ, R2=
2.2KΩ, Rc= 3.6KΩ, RE= 1KΩ
b. For the circuit shown in Fig 1b, determine the voltage gain and ac 10 L3
load voltage if β = 150

Fig 1b

OR
2 a. Design the voltage divider bias circuit to meet the following specifications 10 L3
Vcc=10V, VCE at mid point, stiff voltage divider, collector current 1mA,
βdc = 70 -200
b. For the circuit shown below in Fig 2b, the ac generator has an 10 L3
internal resistance of 600Ω for a voltage divider circuit. Determine
the output voltage if β = 300

Fig 2b

MODULE-2
3 a. With neat circuit diagrams, explain biasing of MOSFET by fixing the 10 L3

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gate voltage
b. With neat circuit diagram, develop an expression for voltage gain, 10 L3
input impedance and output impedance for common gate amplifier.
OR
4 a. Develop an expression for drain to source voltage for a MOSFET 10 L3
amplifier using drain to gate feedback resistor.
b. Develop an expression for transconductance in terms of drain current and 4 L3
overdrive voltage.
c. With neat circuit diagram, develop an expression for voltage gain, input 6 L3
impedance and output impedance for common source amplifier without
source resistance.
MODULE-3
5 a. With neat circuit diagram, explain the operation of R-2R DAC 7 L2
b. For the circuit shown in Fig 5b, the input voltage is a sine wave with peak 7 L3
value of 10V. Determine the trip point. Also plot the input output
waveform

Fig 5b

c. With neat circuit diagram, explain the operation of Schmitt trigger. 6 L2

OR
6 a. With neat circuit diagram, internal diagram of 555 timer and 10 L3
waveforms explain the operation of astable multivibrator.
b. With neat circuit diagram, explain the operation of wein bridge 10 L3
oscillator
MODULE-4
7 a. Classify negative feedback amplifiers and explain each with neat 10 L3
block diagram.
b. Calculate the feedback fraction, ideal closed loop gain, percentage error 5 L3
and exact closed loop voltage gain. Use AOL = 100,000 for 741C

c. With neat circuit diagram and expressions, explain current 5 L3

amplifiers.
OR
8 a. Classify the filters and explain the ideal response for each of the 10 L3

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filters.
b. With neat circuit diagrams, explain the operation of first order low pass 10 L3
filter and high pass filter
MODULE-5
9 a. With neat circuit diagram and waveform explain SCR phase control 10 L3
using RC circuit
b. With neat circuit diagram, explain the operation of UJT and hence 10 L3
explain how it is used as relaxation oscillator.
OR
10 Make use of break over characteristics to explain the operation of 4 10 L3
layer diode
Write short notes on IGBT 5 L3
Explain bi-directional thyristors in brief. 5 L3

Page 03 of 02
 GBGS SGHEME
ESx Gw2| 2 Ec1|y4 BEC303
Third Semester B.EBTech. Degree Examination, June/July 2024
Time: 3 hrs
Electronic Principles and Circuits
Note: I. 4nswer any FVEfull guestions, Max Marks: 100
choesing ONE full
2 M:Marks, L
Bloom'y level, C Course ocomes question fromm eack module.
Q.1 Wieh a ncat circuit Module ML
also derive the dagram. explain the voage divider basing crcum and 1e L3COI
b.
What is the expression
collector-emter
28-0 8in s
voltage Fig
Qb) 10 L3 COI
i

Fig Qlb,
OR
Q2 With diagra explain the two transisturs model. Also
b. deriveZhasc)
Explain de base biased amplhfier orcuit. Alse explain 10 L3CoI
circut. ACcquivalent 10 L3 COI
03 Medule-2
With dagram explain the enhancement model MOSFET Draw
Transconductance curve Dran and 10 BCO2
BDerean espresst of oVos relatonshig ot NMOS wastot 10 L3CO2
OR
Q4 Derine an expecsop of DC bias point and
operation of MOSPET voltage gam of Sall siral 10 L3C02
b.Wtha neat diaeram explain the MOSFET I-qurvalert crcuit
10 L3 CO2
Module3
Q.5 a.Wth dapcamexplain the R2R ADCcomverter derive V
b. Derive V and £ of 10 L3 CO3
comparators with nen zero reference to Incar 10 L3
Amplífier. CO3
OR
Q.6 With ncat dagrarctplain the operatsanal amplifier hase wcin bridge
oscillatorcircuit 10 L3 CO3
b. Explain the opecitn of RC phasç st oscillator,
Module
10 LI COI
Q.7 1Briefly explar the four types offcgatNe foedhack
b.Wth dagram explain the lCVS amplifier circut L3 C04
OR CO4
Q.8 a.
Wth dagram explain the passband and stopband
b. attenuation
Explam with crcuit diagram of VCVS Hgh pass filter 10 L3 CO4
10 L3 CO4
Module-5
Q.9 With neat diagriu explan the DC and AC two load line of
b. Derive an expression of A of Class Apower VIDB amplifier 10 L3 COS
amplifier 10 L3Cos
OR
Q.10 a. With crcat and waveform evplain the l-o RC
b. With pcat diagram cxplain the Trac Dactrggering circuit 10 L3 COS
bascd bidirectaal phase 10 L3C05
cuntrol circuit using SCR