APPSC Polytechnic Lecturers 2025: Lecturers in Government Polytechnic Colleges (Notification 13/2023), Paper II electronicscommunicationengineering

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Notations :
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2.Options shown in red color and with icon are incorrect.



Question Paper Name :                                                       ECLR9
                                                                           Paper II Lecturer in Electronics and Communication
Subject Name :
                                                                           Engineering
Creation Date :                                                            2025-07-16 01:29:01
Duration :                                                                 150
Total Marks :                                                              300
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                 Paper II Lecturer in Electronics and Communication Engineering
Group Number :                                                             1
Group Id :                                                                 441009731146
Group Maximum Duration :                                                   0
Group Minimum Duration :                                                   150
Show Attended Group? :                                                     No
Edit Attended Group? :                                                     No
Break time :                                                               0
Group Marks :                                                              300



                 Paper II Lecturer in Electronics and Communication Engineering
Section Id :                                                               441009736795
Section Number :                                                           1
Section type :                                                             Online
Mandatory or Optional :                                                    Mandatory
Number of Questions :                                                      150
Number of Questions to be attempted :                                      150
Section Marks :                                                            300
Section Negative Marks :                                                   0.66
Maximum Instruction Time :                                                 0
Sub-Section Number :                                                       1
Sub-Section Id :                                                           441009739248
Question Shuffling Allowed :                                               Yes

Question Number : 1 Question Id : 441009798793 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Determine the impulse response of system represented by Transfer function z/(z − 5) for ROC z < 5.
Options :
1.   h(n) = 5^n * u(n − 1)
2.   h(n) = − 5^n * u(−n − 5)
3.    h(n) = − 5^n * u(−n − 1)
4.   h(n) = − 5^n * u(−n + 1)


Question Number : 2 Question Id : 441009798810 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

Group delay of the LTI system primarily impacts the ___________.
Options :
1.   amplitude response only
2.   phase characteristics only
3.   both amplitude and phase characteristics
4.   neither amplitude nor phase characteristics


Question Number : 3 Question Id : 441009936245 Question Type : MCQ
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4.   -5

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Question Number : 5 Question Id : 441009798732 Question Type : MCQ
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In a Thevenin equivalent circuit with a 2 Ω source resistance, a variable load is adjusted for maximum power transfer, resulting in a
transferred power of 2 watts. Determine the Thevenin voltage and the value of the load resistance at this maximum power transfer
condition.
Options :
1.   Vth = 2 V, RL = 2 Ω
2.   Vth = 4 V, RL = 4 Ω
3.   Vth = 4 V, RL = 2 Ω
4.   Vth = 2 V, RL = 4 Ω


Question Number : 6 Question Id : 441009798740 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
If the RMS value of the Sinusoidal AC signal is 10 V and its average value is 5 V, then the form factor is ________.
Options :
1.   0.5
2.   50
3.   2
4.   5


Question Number : 7 Question Id : 441009798776 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

Determine the transfer function and cut-off frequency (in rad/sec) of a simple R-C series section with output across Capacitor C.
Options :
1.   TF= sC/(1 + RsC), Cut-off frequency = C/R
2.   TF= 1/(1 + RsC), Cut-off frequency = RC
3.   TF= s/(1 + RsC), Cut-off frequency = R/C
4.   TF= 1/(1 + RsC), Cut-off frequency = 1/RC


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Question Number : 10 Question Id : 441009798701 Question Type : MCQ
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Determine the current I flowing through            resistor and supply voltage E if the clockwise loop currents in loop 1 is 5 A
and loop 2 is 3A and = = 5Ω

Options :
1.   E=35 V , I= 8 A
2.   E=25 V , I= 2 A
3.   E=35 V , I= 2 A
4.   E=25 V , I= 8 A


Question Number : 11 Question Id : 441009798753 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Determine the quality factor of the series RLC circuit if R = 10Ω, L = 0.1 m H and C = 1 µF.
Options :
1.   10
2.   100
3.   1
4.   0.1


Question Number : 12 Question Id : 441009936242 Question Type : MCQ
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Consider an RC circuit with R=1kΩ and C=1μF. What will be the time constant for this circuit?
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Question Number : 15 Question Id : 441009936249 Question Type : MCQ
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Let x[n]=[1 1] have DFT X(k), if y[n]=x[n/2], compute Y(k).
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Question Number : 19 Question Id : 441009798877 Question Type : MCQ
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Which of the following components is paired with LDR to design a light beam-based intruder detection system?
Options :
1.   Zener diode
2.   UJT
3.   LED
4.   TRIAC


Question Number : 20 Question Id : 441009799116 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Identify the correct process used to create a doped semiconductor layer in MOSFET by infusing charges.

Options :
1.   Metallisation
2.   Ion implantation
3.   Photolithography
4.   Oxidation


Question Number : 21 Question Id : 441009936251 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
The energy differences between the top of the valence band and the bottom of the conduction band of Silicon
and Germanium are _______ and _________, respectively.
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Question Number : 23 Question Id : 441009936265 Question Type : MCQ
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CMOS operates as ______ and uses ______ pairs of P-type and N-type MOSFETs for its construction.
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Question Number : 24 Question Id : 441009798864 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
The built-in barrier potential of PN junction diode is __________ the doping concentration in semiconductor.
Options :
1.   directly proportional to the logarithm of
2.   inversely proportional to the logarithm of
3.   independent of

4.   always zero for any value of


Question Number : 25 Question Id : 441009799107 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
When a MOS capacitor is biased with a gate voltage much higher than its threshold voltage, what condition is established at the
semiconductor surface?
Options :
1.   Depletion
2.   Accumulation
3.   Inversion
4.   Attenuation


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Question Number : 30 Question Id : 441009798854 Question Type : MCQ
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Identify whether the given statements related to carriers in semiconductors is true.

Statement I: Generation involves electrons moving from the valence band to the conduction band, leaving behind a hole.
Statement II: Recombination is the reverse process where electrons and holes recombine, increasing the number of free charge carriers.
Options :
1.   Only statement I is true
2.   Only statement II is true
3.   Both statements I and II are true
4.   Both statements I and II are false


Question Number : 31 Question Id : 441009799099 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Which of the following semiconductor devices is designed to operate in reverse bias and is highly sensitive to light intensity?
Options :
1.   LED
2.   Photodiode
3.   SCR
4.   UJT


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Question Number : 38 Question Id : 441009799158 Question Type : MCQ
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The feedback section of the Wein Bridge oscillator using OP-AMP consists of which of the following?
Options :
1.   Two R-C shunt sections
2.   R-C series and R-C shunt section
3.   Two R-C series sections
4.   Three R-C series sections


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Question Number : 42 Question Id : 441009936285 Question Type : MCQ
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A/An _______ is used to convert a sinusoidal signal into a square wave signal.
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Question Number : 44 Question Id : 441009799202 Question Type : MCQ
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Identify the circuit component used to stabilise the output of the peak detector circuit using op-amp.
Options :
1.   Inductor
2.   Relay
3.   Capacitor
4.   Thermistor


Question Number : 45 Question Id : 441009799217 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Arrange the block for AC to DC power conversion circuit.

a. Filter
b. Rectifier
c. Regulator
d. Step-down transformer
Options :
1.   a-d-b-c
2.   b-d-a-c
3.   a-c-b-d
4.   d-b-a-c


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Question Number : 52 Question Id : 441009799131 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
What is the effect of cascading multiple amplifier stages on the overall gain and bandwidth of the system?
Options :
1.   Overall gain increases, and overall bandwidth decreases.
2.   Overall gain decreases, and overall bandwidth increases.
3.   Overall gain and bandwidth both increase.
4.   Overall gain and bandwidth remain the same as a single stage.


Question Number : 53 Question Id : 441009799144 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Determine the output of a simple OP-AMP based circuit with non-inverting terminal grounded and it does not have a feedback resistor and
input is a sinusoidal AC signal feed to the inverting terminal.
Options :
1.   Amplified Cosine wave
2.   Amplified Sine wave
3.   Square wave

4.   Spike signals


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Question Number : 59 Question Id : 441009799279 Question Type : MCQ
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Identify the correct set of components used to realise a Half Adder.
Options :
1.   OR gate and NOT gate
2.   EXOR gate and AND gate
3.   NAND gate and OR gate
4.   NOR gate and NAND gate


Question Number : 60 Question Id : 441009799352 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Which lines of 8085 are used to control data transfer when 8085 interacts with I/O device?
Options :
1.   clock OUT and HOLD
2.   Reset OUT and HLDA
3.   Read bar(RD̄ ) and write bar(WR̄ )
4.   TRAP and Vcc


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Question Number : 65 Question Id : 441009799293 Question Type : MCQ
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In a static CMOS invertor, the __________________.

Options :
1.    NMOS and PMOS works as pull-up
2.    NMOS and PMOS work as pull-down
3.    NMOS works as pull-down and PMOS works as pull-up
4.    NMOS works as pull-up and PMOS works as pull-down


Question Number : 66 Question Id : 441009799325 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
If the number of flipflops in a counter circuit is increased by 1, then the number of states count ___________.
Options :
1.    gets halved
2.    gets doubled
3.    gets tripled
4.    remains the same


Question Number : 67 Question Id : 441009799338 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
In finite state machines, we can use state reduction technique if:

a. both states have identical outputs
b. every input lands up to equivalent state
c. the output state is independent of the input
Options :
1.    Only b
2.    Both a and c
3.    Both a and b
4.    a, b and c


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Question Number : 73 Question Id : 441009799260 Question Type : MCQ
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Identify the correct Idempotent Boolean Law.
Options :
1.   X+0=X
2.   X + X’ = 1
3.   X+X=X
4.   X+1=1


Question Number : 74 Question Id : 441009799313 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
If the J and K inputs of JK Flip flop are shorted together, then we get:
Options :
1.   MASTER SLAVE J-K FLIP FLOP
2.   S-R FLIP FLOP
3.   D-FLIP FLOP
4.   T-FLIP FLOP


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Question Number : 81 Question Id : 441009936292 Question Type : MCQ
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Note: For this question, discrepancy is found in question/answer.
So,this question is ignored for all candidates.
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Question Number : 82 Question Id : 441009677003 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
In a basic control system, which of the following components compares the desired output with the actual output to generate an error
signal?
Options :
1.   Sensor
2.   Comparator
3.   Actuator
4.   Load

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Question Number : 86 Question Id : 441009812855 Question Type : MCQ
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Which of the following correctly describes the effect of a lag compensator on a control system’s stability?
Options :
1.   It decreases the system's phase margin, making it less stable.
2.   It increases the system's phase margin, making it more stable.
3.   It deteriorates the steady-state accuracy.
4.   It has no significant impact on the system's stability margins.


Question Number : 87 Question Id : 441009821726 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
In state-space analysis, what is the general solution for the state equation                    of an LTI system with initial
condition x(0) = x0?
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Question Number : 88 Question Id : 441009936313 Question Type : MCQ
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Compute the feedback path gain of the negative feedback system where the closed loop transfer function is 1/(s+3) and open loop function
is 1/(s+1).
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Question Number : 92 Question Id : 441009677911 Question Type : MCQ
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For a signal flow graph with the following:

Forward path gain:
Individual loop gains:
No non-touching loops

Using Mason’s Gain Formula, what is the overall transfer function of the system?
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Question Number : 96 Question Id : 441009677152 Question Type : MCQ
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What is the transfer function of a block diagram where two blocks with transfer functions G1(s) and G2(s) are connected in series?
Options :
1.   G1(s) + G2(s)
2.   G1(s) – G2(s)
3.   G1(s) × G2(s)
4.   G1(s) / G2(s)


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Question Number : 100 Question Id : 441009677796 Question Type : MCQ
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Which of the following statements about the Nyquist stability criterion is INCORRECT?
Options :
1.   It relates the number of clockwise encirclements of −1 + j0 to system poles in the right half-plane.
2.   The Nyquist plot is a frequency response plot of the open-loop transfer function.
3.   The Nyquist criterion can only be applied to stable open-loop systems.
4.   For a stable closed-loop system, the number of clockwise encirclements equals the number of open-loop poles in the right half-
plane.


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Question Number : 104 Question Id : 441009799373 Question Type : MCQ
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Which of the following filter types is represented by the transfer function H(s) = s/(s + 2)?
Options :
1.   Low Pass Filter
2.   High Pass Filter
3.   Band Pass Filter
4.   Band Reject Filter


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Question Number : 109 Question Id : 441009799426 Question Type : MCQ
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In information theory, identify the correct relation between mutual information and entropy.
Options :
1.   I(X,Y) = H(X) + H(Y) − H(X,Y)
2.   I(X,Y) = H(X) − H(Y) − H(X,Y)
3.   I(X,Y) = H(X) + H(Y) + H(X,Y)
4.   I(X,Y) = −H(X) + H(Y) − H(X,Y)


Question Number : 110 Question Id : 441009799442 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
In pulse code modulation, if the number of bits per sample representation increases , then the quantisation error_______________ and
band width requirement __________.
Options :
1.   increases, decreases
2.   decreases, decreases

3.   increases, increases
4.   decreases, increases


Question Number : 111 Question Id : 441009799452 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
In QPSK Modulation method, the symbols are given the phase shifts of __________.
Options :
1.   0°and 180° only
2.   45°, 135°, 225° and 315°
3.   60°, 120°, 180° and 240°
4.   30°, 60°, 90° and 180°


Question Number : 112 Question Id : 441009936338 Question Type : MCQ
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Question Number : 113 Question Id : 441009936345 Question Type : MCQ
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Question Number : 114 Question Id : 441009936353 Question Type : MCQ
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Question Number : 115 Question Id : 441009799398 Question Type : MCQ
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In Analogue communication, the circuit generally used to process the received signal from the antenna is _______________ and the final
stage of the received circuit is ____________ after which the signal is fed to the loudspeaker.
Options :
1.   audio frequency amplifier, mixer
2.   radio frequency amplifier, power amplifier
3.   power amplifier, local oscillator
4.   tuner, mixer


Question Number : 116 Question Id : 441009799461 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
The intersymbol interference (ISI) can be minimised using:
a. filters with low quality factor and high bandwidth
b. raised cosine filter
c. higher cutoff frequency high pass filter
Options :
1.   Only b
2.   Only a
3.   Only a and c
4.   Only b and c


Question Number : 117 Question Id : 441009936336 Question Type : MCQ
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Question Number : 118 Question Id : 441009936344 Question Type : MCQ
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For a discrete, memoryless noise-free channel with conditional probability zero, the channel capacity has ______ value of one bit per
channel and the entropy function attains its ______.
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Question Number : 119 Question Id : 441009936349 Question Type : MCQ
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Question Number : 120 Question Id : 441009936335 Question Type : MCQ
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Question Number : 121 Question Id : 441009936352 Question Type : MCQ
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Question Number : 122 Question Id : 441009799407 Question Type : MCQ
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For a binary source in a communication system, the highest value of source entropy is _______ and the lowest is _________.

Options :
1.   infinite bits,1 bit
2.   infinite bits, 0 bits
3.   1 bit, 0 bits
4.   10 bits,1 bit


Question Number : 123 Question Id : 441009936350 Question Type : MCQ
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Question Number : 124 Question Id : 441009799386 Question Type : MCQ
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Determine the amount of deviation in carrier frequency produced in the FM system, where the bandwidth is 100 kHz and the audio signal
frequency is 5 kHz.
Options :
1.   20 kHz
2.   45 kHz
3.   95 kHz
4.   55 kHz


Question Number : 125 Question Id : 441009936339 Question Type : MCQ
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Question Number : 126 Question Id : 441009936346 Question Type : MCQ
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Question Number : 127 Question Id : 441009936333 Question Type : MCQ
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Question Number : 128 Question Id : 441009936341 Question Type : MCQ
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Question Number : 129 Question Id : 441009677571 Question Type : MCQ
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In a transmission line, what is the purpose of impedance transformation?
Options :
1.   To increase the frequency of the transmitted signal
2.   To match the load impedance to the line impedance
3.   To increase the power of the signal

4.   To reduce the resistance of the conductor


Question Number : 130 Question Id : 441009677591 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
The Smith Chart is mainly used for which of the following applications?
Options :
1.   Calculating inductance of coils
2.   Determining the type of transmission line
3.   Solving impedance matching problems
4.   Measuring the electric field intensity


Question Number : 131 Question Id : 441009936356 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Which of the following options represents Gauss's law for the electric field in a homogenous and isotropic medium?

Note: For this question, discrepancy is found in question/answer.
So,this question is ignored for all candidates.
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Question Number : 132 Question Id : 441009936374 Question Type : MCQ
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What is the type of antenna if a rectangular waveguide is flared in both the planes of electric and magnetic fields?
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Question Number : 133 Question Id : 441009936375 Question Type : MCQ
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Question Number : 134 Question Id : 441009936355 Question Type : MCQ

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Question Number : 135 Question Id : 441009936359 Question Type : MCQ
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Question Number : 136 Question Id : 441009936360 Question Type : MCQ
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Question Number : 137 Question Id : 441009936363 Question Type : MCQ
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Question Number : 138 Question Id : 441009936365 Question Type : MCQ
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Question Number : 139 Question Id : 441009936366 Question Type : MCQ
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Question Number : 140 Question Id : 441009677714 Question Type : MCQ
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In a broadside linear antenna array, what condition must be met for the main lobe to be perpendicular to the array axis?
Options :
1.   Phase difference between elements = 0∘
2.   Phase difference between elements = 180∘
3.   Element spacing = λ/4
4.   Element spacing = λ/8


Question Number : 141 Question Id : 441009677746 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
The Poynting vector is defined as S = E × H. Which of the following correctly represents its physical meaning and units?
Options :
1.   Power per unit area carried by an electromagnetic wave, measured in Watts/m2.
2.   Power stored in an electric field, measured in Joules.
3.   Power dissipated by a magnetic field, measured in Amperes.
4.   Electric field energy density, measured in Joules per Coulomb.


Question Number : 142 Question Id : 441009936367 Question Type : MCQ
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Question Number : 143 Question Id : 441009936369 Question Type : MCQ
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Question Number : 144 Question Id : 441009821749 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Which statement best describes the difference between phase velocity and group velocity for a plane wave?
Options :
1.   Phase velocity always exceeds group velocity.
2.   Phase velocity is the speed of energy transport, while group velocity is the speed of phase fronts.
3.   Phase velocity is the speed of phase fronts, while group velocity is the speed of energy or information transport.
4.   Phase velocity and group velocity are always the same in any medium.


Question Number : 145 Question Id : 441009936361 Question Type : MCQ
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Question Number : 146 Question Id : 441009677630 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
In optical fibre communication, how does light propagate within the fibre?
Options :
1.   By reflection at the fibre’s outer surface
2.   By refraction at the fibre’s core
3.   By total internal reflection within the fibre’s core
4.   By absorption in the fibre’s cladding

Question Number : 147 Question Id : 441009936376 Question Type : MCQ
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Question Number : 148 Question Id : 441009936370 Question Type : MCQ
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Question Number : 149 Question Id : 441009936357 Question Type : MCQ
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Question Number : 150 Question Id : 441009936358 Question Type : MCQ
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