Subject:-Basic Electronics Engg.(Theory question bank)
Unit 1:-Diode Circuit
Q1) Draw the circuit and explain the operation of half wave rectifier.
[4]
Q2) A HWR with RL=1kohm is given an input of 10V peak from step down
transformer. Calculate D.C voltage and load current for ideal &silicon diode.[6]
Q3)A diode whose internal resistance is 20ohm is to supply power to a 1000ohm load
from an 110Vrms source o supply.
Calculate 1)Im
2)Vldc 3)Irms
4)Pac 5)Pdc
[8]
Q4) Draw the circuit and explain the operation of centre tapped full wave rectifier[4]
Q5)Prove that max theoretical efficiency of centre tap FWR is 81.2%.
[2]
Q6)The input signal voltage to FWR is 160 sin(2π(60)t)V.assume Vr=0.7V for each
diode calculate:-1)required turns ratio of transformer to produce a peak output
voltage 25V
2)PIV of each diode
3)output frequency
[8]
Q7)Draw the circuit of bridge rectifier and explain its operation. Give the input and
output waveform.
[6]
Q8)Explain the need of filter circuits. which elements are used in filter circuit?
[2]
Q9)Explain the operation of the Capacitor filter with half wave rectifier.
[4]
Q10)Draw a neat circuit diagram of bridge rectifier with capacitor filter and explain
its operation with waveform.
Q11)Define clipper circuits. state the types of clipper circuit.
[6]
[2]
Q12)Draw the circuit of negative clipper and explain its operation along with the [4]
waveform.
Q13)Draw the circuit of positive clipper and explain its operation along with the
waveform.
[4]
Q14)Draw a negative clamper and explain its working along with the waveform. [4]
Q15)Draw a positive clamper and explain its working along with the waveform
[4]
Q16)Draw the circuit of half voltage doubler and explain its operation
[4]
Q17)Draw the circuit of full wave voltage doubler and explain its operation
[4]
Q18)Draw the circuit of voltage Tripler and explain its operation
[4]
Q19)What is regulated power supply? Draw and explain its block schematic
[4]
Q20)Explain the principle of working of zener diode as regulator. Discus the
[6]
performance of zener diode regulator interms of source and load effects
Q21)In the shunt regulator using zener diode, calculate min and max values of current
limiting resistor.
Given Vz=8V,source voltage=30V,
Subject:-Basic Electronics Engg.(Theory question bank)
load current=0-50mA,Izmin=5mA,Pzmax=1W
[8]
Q22)Explain working principle of LED.[2]
Q23)State the material used in LED.[2]
Q24)Explain the construction and working principle of photodiode.[3]
Q25) Describe with the help of neat diagram operation of Zener voltage regulator. [6]
Q26) Explain breakdown mechanism in Zener diode [4]
Q27) Compare half wave, centre tapped full wave and bridge full wave rectifier [6]
Q28) Compare avalanche and Zener breakdown
[2]
UNIT-II:-BJT
Q1)State the biasing conditions required for three region of operation of BJT.[2]
Q2)Explain the working principle of npn transistor?[4]
Q3)Sketch and explain the input characteristics of transistor in CB configuration[3].
Q4)With a neat diagram explain the output characteristics of transistor in CB
Configuration[4]
Q5)Given IE=2.5mA,α=0.98,and ICBO=10uA,calculate IB and IC.[4]
Q6)Derive the relationship between αdc and βdc.[4]
Q7)calculate the value of IC and IE for BJT with αdc=0.97 and IB=50uA.Determine
βdc for the device.[4]
Q8)Sketch and explain the input characteristics of transistor in CE configuration.[3]
Q9)With a neat diagram explain output characteristics of npn transistor in CE
Configuration.[4]
Q10)What is d.c load line?Derive its equation for a CE amplifier.[4]
Q11)Explain the working of transistor as a switch.[4]
Q12)Explain the construction of n-channel enhancement type MOSFET.[4]
Q13)Explain the working of n-channel enhancement type MOSFET.[4]
Q14)Draw and explain drain characteristics of an n-channel EMOSFET.[4]
Q15)Comparison of CE,CB and CC configuration.[4]
Q16)Comparison between BJT and MOSFET.[4]
Q17) What is significance of input resistance in a voltage amplifier. [3]
Q18) What is significance of output resistance in a voltage amplifier. [3]
Subject:-Basic Electronics Engg.(Theory question bank)
UNIT-III:Linear IC
Q1)Define CMRR of an op-amp. What is its ideal value.[2]
Q2)Determine the output of op-amp for input voltage of 300uV and 240uV.the
differential gain of the amplifiers is 5000 and the value of CMRR is 100000.[6]
Q3)A certain op-amp has loop gain of 100000 and common mode gain of
0.2.Determine CMRR and express in dB.[4]
Q4)Draw the internal block diagram of op-amp and mention the role of each stage.[4]
Q5)Explain the ideal op-amp characteristics.[4]
Q6)Define and give typical values of following op-amp parameters:
i)Voltage gain
iv)slew rate
ii)CMRR
v)input impedance
iii)input offset voltage
vi)output impedance vii)PSRR
viii)BW
[8]
Q7)Write down the typical value for IC 741C of following parameter:
i)input offset voltage
ii)input offset current
iii)slew rate
iv)CMRR
[4]
Q8)Why is it necessary to reduce the gain of op-amp from its open loop value.
[2]
Q9)State advantage and application of negative feedback.
[2]
Q10)Prove that for an inverting amplifier Av=-Rf/R1
[4]
Q11) Prove that for non- inverting amplifier Av=1+Rf/R1.[4]
Q12)An op-amp is used in non –inverting mode with R1=1Kohm,Rf=12Kohm.
VCC=+15 and -15V.calculate output voltage
i)Vin=250mV
ii)Vin=3V
[6]
Q13)Draw the circuit of voltage follower and obtain expression for its output voltage
.where it is used.[4]
Q14)Describe use of an op-amp as adder. What type of feedback is used in an op-amp
adder. Justify your answer.[6]
Q15) for the inverting summing amplifier if following inputs are applied then
calculate
output voltage .
Vin1=1.5V
Vin2=3.5V
Given that R1=R2=Rf=5.2Kohm.[4]
Q16)Draw the circuit diagram of op-amp integrator and derive the expression for its
output voltage.[4]
Q17)Draw the output waveform of integrator for
Subject:-Basic Electronics Engg.(Theory question bank)
i)step
ii)square
iii)sine wave [4]
Q18) Give the drawback of an ideal integrator. How they are overcome in practical
Integrator.[4]
Q19) Draw the circuit diagram of op-amp Differentiator and derive the expression for
Its output voltage.[4]
Q20)Draw the output waveform of Differentiator for
i) Step
ii) square
iii) sine wave [4]
Q21)Explain the operation of inverting Schmitt trigger circuit.[4]
Q22)Explain the functional block diagram of IC555.[6]
Q23)Explain the operation of IC555 as an astable multivibrator.[4]
Q24)What is voltage regulator? Define load and line regulation.[3]
Q25)With neat diagram explain series voltage regulator. [4]
Q26) With neat diagram explain shunt voltage regulator. [4]
Q27) Explain non inverting op-amp comparator. [4]
Q28) Explain inverting op-amp comparator.
[4]
Q29) Explain non inverting summing amplifier with two inputs. [4]
Q30) Explain the concept of virtual ground and virtual short. [6]
UNIT-IV:-Digital Electronics
Q1)Explain the concept of positive and negative logic.[3]
Q2) what are the analog and digital signal.[2]
Q3) write the logic symbol, expression and truth table for following logic gates:
i)NOT
ii)AND
v)EX-OR
vi)NOR
iii)OR
vii)XNOR
Q4)What is mean by universal gate?[2]
Q5)Explain three laws of Boolean algebra.[4]
Q6)State and prove DeMorgans theorem.[4]
Q7)Prove that AB+A+AB=A.[3]
Q8)Explain sum of product form.[3]
Q9)Explain Product of sum form.[3]
Q10)Design half adder circuit using NAND gate.[3]
Q11)Implement full adder using basic gates truth table.[3]
iv)NAND
[6]
Subject:-Basic Electronics Engg.(Theory question bank)
Q12)What is multiplexer? Give application of multiplexer.[3]
Q13)Draw schematic diagram and explain the working of 8:1 multiplexer.[4]
Q14)what is relation between number of select line and inputs of multiplexer.[2]
Q15)Draw and explain the working of 1:4 Demultiplexer.[3]
Q16)Explain the operation of 1-bit memory cell.[3]
Q17)Draw and explain the operation of D flip-flop,SR flip-flop,T flip-flop.[4]
Q18)What is shift register?[2]
Q19)Explain basic types of shift registers in terms of data movement.[3]
Q20)Draw and explain the operation of 4-bit serial in serial out(shift right mode).[4]
Q21)what do you mean by counter?[2]
Q22)Draw and explain the operation of 2 bit synchronous counter.[4]
Q23)Draw and explain block diagram of microprocessor.[3]
Q24) Draw and explain block diagram of microcontroller.[4]
Q25)Give the comparison between microprocessor and microcontroller.[3]
Q26)Implement full adder using Half adder.[4]
Q27)Draw and explain operation of 2 bit Asynchronous counter.
Q28)Implement following expression using multiplexer.
F(A,B,C)=Ʃm(0,1,2,6) and f(A,B,C)=πM(2,3,5,7)
[4]
Q29) Draw and explain the operation of 4-bit serial in serial out(shift right mode).[4]
Q30) Compare synchronous and asynchronous counters [2]
Q31) Realize all basic gates by using NAND gates only. [4]
Q32) Realize all basic gates by using NOR gates only. [4]
Q33) Explain how XOR and XNOR gates can be used as inverters. [4]
UNIT-V:-power devices and transducer.
Q1)Explain the construction of SCR.[3]
Q2)Explain working principle of SCR.[2]
Q3)Draw and explain the operation of SCR using two transistor equivalent circuits.[4]
Q4)Draw and explain characteristics of SCR.[4]
Q5)State the various parameters of SCR.[3]
Q6)State the advantages ,disadvantage and application of SCR.[3]
Q7)Explain construction ,symbol, working of Diac.[4]
Q8)What is Triac.Explain its construction ,symbol and equivalent circuit.[4]
Subject:-Basic Electronics Engg.(Theory question bank)
Q9)Explain the working of triac.Draw and explain the V-I characteristics of triac.[6]
Q10)compare SCR and triac.[3]
Q11)Draw the block diagram of instrumentation system and state the function of each
block.[4]
Q12)Define transducer. Give the classification of transducer.[3]
Q13)What is electrical transducer. State advantages and disadvantages.[3]
Q14)Write a short note on selecting criteria for transducer.[4]
Q15)Explain the principle used in resistive transducer.[3]
Q16)State the materials used in thermistor and explain the construction of it.[4]
Q17)Explain the working of inductive transducer based on variation of self
inductance.[4]
Q18)Explain the construction and principle of operation of LVDT.[4]
Q19)State advantages and disadvantages of LVDT.[3]
Q20)Explain the construction and working principle of a phototransistor.[3]
Q21)Explain the principle of operation and construction of thermocouple.[4]
Q22)State advantages ,disadvantages and application of thermocouple.[3]
Q23)Explain working principle of RTD.[2]
Q25)Draw a neat diagram of digital thermometer and explain its operation.[4]
Q26)Explain with block diagram electronic weighing machine .[4]
Q27)Explain construction and working principle of Load cell.[4]
Q28)Explain construction of turbine Flowmeter.[4]
UNIT-VI:Electronic communication
Q1)Explain the element of communication system with the help of block diagram.[6]
Q2)Draw and explain electromagnetic spectrum.[4]
Q3)State the type of wired media of transmission.[3]
Q4)Write a short note on twisted pair cables.[4]
Q5)Write a note on co-axial cable.[4]
Q6)Write a short note on optical fibre.[4]
Q7)Give the comparison between twisted pair,co-axial and fibre optic cable.[4]
Q8)Explain the need for modulation.[3]
Q9)Define AM and Draw waveform of AM wave.[3]
Q10) Derive the expression of AM wave.[4]
Subject:-Basic Electronics Engg.(Theory question bank)
Q11)Define modulation index of AM.[2]
Q12)A carrier of 10v peak and frequency 100khz is amplitude modulated by a sine
wave of 4V peak and frequency 1000hz .determine the modulation index for
modulated wave and draw the frequency spectrum.[8]
Q13)Define FM. Sketch the FM wave.[3]
Q14)Write the expression of FM.[2]
Q15)FM signal is given by e=10sin(8*109+4sin1500t)
Calculate 1)carrier frequency
3)modulation index
2)modulating frequency
4)max deviation
5)BW [8]
Q16)Define Deviation ratio.[2]
Q17)Give comparison between AM and FM.[6]
Q18)Draw and explain block diagram of mobile communication system.[4]
Q19)State Merits of FM over AM.[3]
Q20)If FM wave is represented by equation ;
V=10sin(8*108+4sin1000t)
Calculate
1)carrier frequency
2)modulating frequency
3)modulation index
4)max deviation
5)BW [8]
Q21)Explain the effect of modulation index in FM.[3]
Q22)Explain concept of cellular system.[3]
Q23)What is importance of modulation index. Draw the AM waveform for
a) linear modulation b) over modulation c) modulation index=0
[8]
Q24)With respect to FM explain
a)Frequency deviation b)Modulation index c)Deviation ratio d)FM spectrum[8]
Q25)Draw and explain block diagram of GSM system