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

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Question Paper Name :                                        ECLR11
                                                            Paper II Lecturer in Electronics and Instrumentation
Subject Name :
                                                            Engineering
Duration :                                                  150
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                 Paper II Lecturer in Electronics and Instrumentation Engineering
Group Number :                                              1
Group Id :                                                  441009731199
Group Maximum Duration :                                    0
Group Minimum Duration :                                    150
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Edit Attended Group? :                                      No
Break time :                                                0
Group Marks :                                               300



                 Paper II Lecturer in Electronics and Instrumentation Engineering
Section Id :                                                441009736848
Section Number :                                            1
Section type :                                              Online
Mandatory or Optional :                                     Mandatory
Number of Questions :                                       150
Number of Questions to be attempted :                       150
Section Negative Marks :                                    0.66
Maximum Instruction Time :                                  0
Sub-Section Number :                                        1
Sub-Section Id :                                            441009739301
Question Shuffling Allowed :                                Yes

Question Number : 1 Question Id : 441009940975 Question Type : MCQ
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Question Number : 5 Question Id : 441009680989 Question Type : MCQ
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A 20 V AC supply is connected to a series circuit containing a resistor and a pure inductor (coil with negligible resistance). If the voltage
across the resistor is 12 V, what is the voltage across the inductor?
Options :
1.   10 V
2.   8V
3.   6V
4.   16 V


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Question Number : 9 Question Id : 441009682008 Question Type : MCQ
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Which of the following types of filter is formed by connecting an inductor in series and a capacitor in parallel (shunt) with the load?
Options :
1.   Band-pass filter
2.   High-pass filter
3.   Low-pass filter
4.   Band-stop filter

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Question Number : 20 Question Id : 441009682141 Question Type : MCQ
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Consider the second-order causal system with the transfer function

What is the damping nature of this system?
Options :
1.   Undamped
2.   Underdamped
3.   Critically damped
4.   Overdamped


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Question Number : 24 Question Id : 441009682156 Question Type : MCQ
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Evaluate the convolution                        .
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Question Number : 25 Question Id : 441009682189 Question Type : MCQ
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Which of the following correctly defines the cross-correlation rxy(L) for two real and finite-energy discrete-time signals x(n) and y(n)?
(Here, lag L represents how much y(n) is shifted in time.)
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Question Number : 30 Question Id : 441009682031 Question Type : MCQ
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Determine the value of y[n] at n=5 if y[n] = sin(2n). δ[n-5]
Options :
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3.   1
4.   0

Question Number : 31 Question Id : 441009682096 Question Type : MCQ
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If                      , then what is its Laplace transform?
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Question Number : 38 Question Id : 441009798329 Question Type : MCQ
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An input synchro in control system generates ___________ proportional to the _________.
Options :
1.   electrical signal, angular position
2.   angular rotation, force
3.   sound waves, pulse width
4.   linear displacement, force


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Question Number : 41 Question Id : 441009798314 Question Type : MCQ
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In lead lag compensator, the lag circuit normally impacts the _________ frequency and the lead network impacts the _________
frequency.
Options :
1.   low, low
2.   low, high
3.   high, Low
4.   high, high

Question Number : 42 Question Id : 441009798320 Question Type : MCQ
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Consider a mechanical system, which forms the body of mass m secured by a spring of stiffness k to the rigid frame. The system performs
linear movement along the axis of the spring. The computation of the system is based on its ____________________.
Options :
1.   first order differential equation
2.   second order differential equation
3.   fifth order differential equation
4.   sixth order differential equation


Question Number : 43 Question Id : 441009798346 Question Type : MCQ
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In a P-I controller, the integral section is used to remove the ____________ and the output of the system is oscillatory if the proportional
control parameter Kp is ___________.
Options :
1.   offset, too high
2.   offset, too low
3.   threshold, too high
4.   threshold, too low


Question Number : 44 Question Id : 441009941016 Question Type : MCQ
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Which of the following transfer functions belongs to lead compensator?
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Question Number : 45 Question Id : 441009941017 Question Type : MCQ
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Question Number : 48 Question Id : 441009798295 Question Type : MCQ
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Determine the value of a capacitor in a RLC series circuit if R = 20 Ω and L = 0.1 mH and the circuit is critically damped.
Options :
1.   C = 10 µF
2.   C = 0.1 µF
3.   C = 4 µF
4.   C = 1 µF


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Question Number : 60 Question Id : 441009798361 Question Type : MCQ
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The type of amplifier that utilises negative feedback, where a part of output voltage is sampled and feedback in series with input signal is
known as:
Options :
1.   voltage series feedback amplifier
2.   voltage shunt feedback amplifier
3.   current series feedback amplifier
4.   current shunt feedback amplifier


Question Number : 61 Question Id : 441009798423 Question Type : MCQ
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An integrator is similar to _________, and differentiator is similar to __________.
Options :
1.   HPF, LPF
2.   LPF, HPF
3.   BPF, HPF
4.   HPF, all pass filter


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Question Number : 63 Question Id : 441009941036 Question Type : MCQ
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Options :
1.   Diode and BJT
2.   JFET and D-MOSFET
3.   Diode and UJT
4.   Linear resistor and diode

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Question Number : 77 Question Id : 441009798456 Question Type : MCQ
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1.   XY + X
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3.   X.Y
4.   X+Y

Question Number : 78 Question Id : 441009798469 Question Type : MCQ
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In digital electronics, a serial input parallel output shift register can work as ______________.
Options :
1.   Serial input serial output
2.   Parallel input parallel output
3.   Parallel input serial output
4.   Universal shift register


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Question Number : 82 Question Id : 441009798472 Question Type : MCQ
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In Flash Type ADC, a _________________ generates the reference voltages and helps in dividing the full-scale input voltage range into
smaller intervals.
Options :
1.   Zener diode
2.   Op-amp
3.   resistive ladder network
4.   function generator


Question Number : 83 Question Id : 441009798484 Question Type : MCQ
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Identify the type of bus required for memory interfacing with microcontroller.
Options :
1.   Address bus only
2.   Data bus only
3.   Control bus only
4.   Address bus, data bus and control bus


Question Number : 84 Question Id : 441009941054 Question Type : MCQ
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Question Number : 88 Question Id : 441009798464 Question Type : MCQ
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Determine the resistor pair of an inverting Schmitt trigger using OP-AMP with threshold voltages of +2 V and −2 V, Vsat = Vcc = 10 V
and sum of the resistor pair is 10 KΩ.
Options :
1.   8 KΩ and 2 KΩ
2.   5 KΩ and 5 KΩ
3.   4 KΩ and 6 KΩ
4.   3 KΩ and 7 KΩ

Question Number : 89 Question Id : 441009798477 Question Type : MCQ
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Identify the correctness of the given statements.

Statement I: Flash ADC is one of the fastest ADC circuits.
Statement II: Successive approximation ADC is commonly used in microcontrollers.
Options :
1.   Only statement I is correct
2.   Only statement II is correct
3.   Both statements I and II are correct
4.   Both statements I and II are incorrect


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Question Number : 96 Question Id : 441009822769 Question Type : MCQ
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What does a DC potentiometer primarily measure?
Options :
1.   Current
2.   Resistance
3.   Power
4.   Voltage

Question Number : 97 Question Id : 441009844938 Question Type : MCQ
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What are the minimum number of flip flops required in a decade counter?
Options :
1.   4
2.   3
3.   2
4.   1


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Question Number : 101 Question Id : 441009822772 Question Type : MCQ
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What is the primary purpose of AC bridges?
Options :
1.   Measurement of resistance only
2.   Measurement of inductance only
3.   Measurement of capacitance only
4.   Measurement of both inductance and capacitance


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Question Number : 106 Question Id : 441009844738 Question Type : MCQ
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What does the crest factor represent in voltage measurement?
Options :
1.   The ratio of RMS voltage to average voltage
2.   The difference between peak and RMS voltage
3.   The ratio of peak voltage to RMS voltage
4.   The average of peak and RMS voltage


Question Number : 107 Question Id : 441009844931 Question Type : MCQ
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Match the following digital voltmeter types with their respective characteristics.

                         Digital Voltmeter type                                                    Characteristics
                                                                        a. Train of voltage pulses generated with a frequency proportional
i. Voltage to time conversion DVM
                                                                        to the magnitude of the input signal
                                                                        b. Error between input voltage level and reference voltage is
ii. Potentiometric DVM                                                  applied to servo driven potentiometer
                                                                        c. Negative-slope ramp voltage is generated and compared with
iii. Voltage to frequency conversion DVM
                                                                        the input signal
Options :
1.   i-c, ii-b, iii-a
2.   i-a, ii-b, iii-c
3.   i-c, ii-a, iii-b
4.   i-b, ii-c, iii-a

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Question Number : 116 Question Id : 441009822784 Question Type : MCQ
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Which of the following transducer generates electrical voltage on application of mechanical force?
Options :
1.   Piezoelectric transducer
2.   Thermocouple
3.   RTD
4.   Optocoupler

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Question Number : 120 Question Id : 441009822789 Question Type : MCQ
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Which of the following flowmeters uses an inclined tube manometer?
Options :
1.   Orifice plate
2.   Venturi meter
3.   Flow nozzle
4.   Pitot tube

Question Number : 121 Question Id : 441009822791 Question Type : MCQ
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Which of the following statements best describes the working principle of a bolometer?
Options :
1.   It measures pressure by converting it into a change in capacitance.
2.   It detects radiation power by absorbing radiation and measuring the resulting resistance change.
3.   It measures light intensity using photoconductive materials.
4.   It uses a piezoelectric crystal to measure mechanical vibrations.


Question Number : 122 Question Id : 441009822794 Question Type : MCQ
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What principle does a radiation pyrometer primarily rely on to measure temperature?
Options :
1.   Newton's Law of Cooling
2.   Stefan–Boltzmann Law
3.   Ohm's Law
4.   Hooke's Law


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Question Number : 124 Question Id : 441009941093 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Which of the following flowmeters CANNOT be used for bidirectional flow measurement?
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Question Number : 125 Question Id : 441009941094 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

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Question Number : 126 Question Id : 441009941095 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

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Question Number : 127 Question Id : 441009822798 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
For a liquid in a glass thermometer. Match the following component with its function.

                             Component                                                                Function
i. Bulb                                                                  a. Holds thermometric liquid like mercury or spirit
ii. Expansion      Chamber                                               b. Allows gas compression for safety margin
iii. Stem                                                                c. Contains capillary tube for liquid movement

Options :
1.    i-a, ii-b, iii-c
2.    i-a, ii-c, iii-b
3.    i-c, ii-a, iii-b
4.    i-b, ii-c, iii-a

Question Number : 128 Question Id : 441009941096 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66


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Question Number : 129 Question Id : 441009941097 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

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Question Number : 130 Question Id : 441009941098 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66


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Question Number : 131 Question Id : 441009941101 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66




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Question Number : 132 Question Id : 441009941102 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66




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Question Number : 133 Question Id : 441009941104 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66




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Question Number : 134 Question Id : 441009682241 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
What is the term for signals that are produced by encoding each quantised value of an analogue signal into a corresponding digital word?
Options :
1.   PAM signal
2.   PCM signal
3.   FM signal
4.   Sampling and quantisation


Question Number : 135 Question Id : 441009682266 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
What is the primary principle behind the operation of an LED?
Options :
1.   Thermionic emission
2.   Photoelectric effect
3.   Electroluminescence
4.   Electron tunneling


Question Number : 136 Question Id : 441009941105 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

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Question Number : 137 Question Id : 441009941107 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

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Question Number : 138 Question Id : 441009682256 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
Compared to BPSK, how does Quadrature Phase Shift Keying (QPSK) improve bandwidth efficiency?
Options :
1.   By using lower carrier frequencies
2.   By transmitting two bits per symbol
3.   By reducing signal power
4.   By compressing the time duration of each bit


Question Number : 139 Question Id : 441009941109 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

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Question Number : 140 Question Id : 441009941110 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

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Question Number : 141 Question Id : 441009941111 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66

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Question Number : 142 Question Id : 441009941112 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66


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Question Number : 143 Question Id : 441009682225 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
What is the maximum power efficiency achievable by an Amplitude Modulation (AM) modulator?
Options :
1.    25%
2.    33%
3.    50%
4.    100%


Question Number : 144 Question Id : 441009682273 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66
In a laser cavity, what is the primary function of the optical resonator (mirrors)?
Options :
1.   To introduce a phase shift for beam shaping
2.   To filter out unwanted frequencies
3.   To provide feedback for sustained stimulated emission
4.   To absorb incoherent light and maintain monochromaticity


Question Number : 145 Question Id : 441009941114 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66


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Question Number : 146 Question Id : 441009941116 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66




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Question Number : 147 Question Id : 441009941117 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66




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Question Number : 148 Question Id : 441009941118 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66




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Question Number : 149 Question Id : 441009941119 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66




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Question Number : 150 Question Id : 441009941120 Question Type : MCQ
Correct Marks : 2 Wrong Marks : 0.66




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