Odisha CPET 2022 Question Paper Electronics Science

ODISHA
CPET

QUESTION PAPER
2022
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COMMON P.G. ENTRANCE TEST–2022 (CPET-2022)

Subject Code : 50 Test Booklet No.:

Entrance Subject : Electronic Science Hall Ticket No.:

TEST BOOKLET

Time Allowed : 90 Minutes Full Marks : 70

INSTRUCTIONS TO CANDIDATES
1. Please do not open this Question Booklet until asked to do so.
2. Check the completeness of the Question Booklet immediately after opening.
3. Enter your Hall Ticket No. on the Test Booklet in the box provided alongside. Do not write
anything else on the Test Booklet.

up Test Booklet Serial No. & OMR Answer Sheet Serial No. in the Attendance Sheet carefully.

5. Each question has four answer options marked (A), (B), (C) & (D).
6. Answers are to be marked on the Answer Sheet, which is provided separately.
7. Choose the most appropriate answer option and darken the oval completely, corresponding to
(A), (B), (C) or (D) against the relevant question number.
8. Use only Blue/Black Ball Point Pen to darken the oval for answering.
9. Please do not darken more than one oval against any question, as scanner will read such markings
as wrong answer.
10. Each question carries equal marks. There will be no negative marking for wrong answer.
11. Electronic items such as calculator, mobile, etc., are not permitted inside the
examination hall.
12. Don’t leave the examination hall until the test is over and permitted by the invigilator.
13. The candidate is required to handover the original OMR sheet to the invigilator and
take the question booklet along with the candidate’s copy of OMR sheet after completion
of the test.
14. Sheet for rough work is appended in the Test Booklet at the end.

W-Electronic Science-50 P.T.O.

1. The frequency of the signal sin t is , then the frequency of the signal sin2 t is:

(A)

(B) 2

(C) /2

(D) 2

2. The curl of a position vector is:

(B) 1

(C) 0

3. What is true for distortionless transmission?

(A) input and output wave shapes remain the same

(C) linear phase delay between all frequency components of the wave

(D) all of the above

4. A particular solution of the differential equation dy /dx=3 y , y (0) = 5.7 is:

(A) 5.7e3x

(B) 5.7e-3x

(C) 0

(D) 1

5.

(A) lnx

(B) cosx

(C) sinx

(D) ex

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6. Eigenvalues of the matrix are:

(A) 2, 3
(B) -2, -3
(C) -2, 3
(D) 2, -3

(A) energy signal

(B) power signal

(C) deterministic signal

(D) all of the above

8. The DC value of a sine wave with peak-to-peak amplitude 2 is:

(A) 0.707

(B) 1

(C) 1.414

(D) 2

9.

(A) 0

(B) 1

10. A continuous baseband signal having bandwidth B is sampled with a sampling
frequency fs to convert it into a discrete signal. What should be the sampling criterion
to be able to reconstruct the continuous signal from the discrete signal?

(A) fs

(B) fs

(C) fs

(D) fs

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11. Phase shift oscillators are based upon:
(A) positive feedback
(B) negative feedback
(C) open loop
12. A rough estimate of the bandwidth of a rectangular pulse of width seconds is
______Hz.
(A) 4/
(B) 3/
(C) 2/
(D) 1/
13. The time constant of a capacitor informs how quickly a capacitor can be charged or

be the value of the time constant of the capacitor?
(A) small
(B) moderate
(C) large
(D) doesn’t matter.
14. Two waves moving in opposite directions, each having the same amplitude and
frequency forms a standing wave. The net transfer of energy in a standing wave is:
(A) double of each
(B) same as each
(C) zero

of the following is correct?

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16. The unit of electron-volt can also be expressed in terms of:

(A) joule

(B) coulomb

(C) watt

(D) volt

17. In a non-dispersive media:

(A) group velocity>phase velocity

(B) group velocity<phase velocity

(C) group velocity=phase velocity

18. Which phenomenon quantum mechanics can explain but classical mechanics can’t?

(A) Compton effect

(B) photoelectric effect

(C) blackbody radiation

(D) all of the above

19. A light source usually emits waves at random frequencies. A source is coherent if the
frequencies of the emitted waves are nearly equal. Which of the following sources is
more coherent?

(A) LASER

(B) LED

(C) sun

(D) incandescent bulb

20. e =?
(A) j

(B) 1

(C) 0

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21. The line integr
(A) 1
(B) 0

22. Differentiation in time domain is equivalent to multiplication by________ in frequency
domain.
(A) j
(B) j2
(C) j3
(D)

(A) 0
(B) 1

(A) 50
(B) 40.6
(C) 81.2
(D) 100

The LASER basically is a/an:

(B) oscillator

(A) 100k
(B) 10k
(C) 5k
(D) 1k

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27. The frequency of domestic electrical power supply used in India is:

(A) 50Hz

(B) 60Hz

(C) 75Hz

(D) 100Hz

28. The impedance of a parallel LC circuit is:

(A) zero at the resonant frequency

(C) zero at all frequencies

29. SPICE is a programming language that is used for simulating an electronic circuit
before implementation. What is its acronym?

(A) Simulation Program with Integrated Circuit Emphasis

(B) Simulation Program with Integrated Current Emphasis

(C) Simultaneous Program with Integrated Circuit Emphasis

(D) Simulation Photonics with Integrated Circuit Emphasis

30. What is the total phase shift requirement (in degree) around the feedback loop for a
phaseshift oscillator?

(A) 90

(B) 180

(C) 270

(D) 360

31. What happens to the gain of an open-loop system when it operates in closed-loop
conditions with negative feedback?

(A) increases

(B) decreases

(C) remains same

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32. If the
be_________Hz.
(A) 200
(B) 100
(C) 50
(D) 25
33. In satellite communication, the attenuation level increases with an increase
in frequency. Which of the following mechanism should be adopted in satellite
communication?
(A) downlink frequency should be larger than the uplink frequency.
(B) downlink frequency should be smaller than the uplink frequency.
(C) both should be the same
(D) doesn’t matter
34. A power ratio of 100 in dB scale is:
(A) 40
(B) 1
(C) 10
(D) 20
35. The phase difference in degree between the input and output of a common-emitter

(A) 90
(B) 180
(C) 270
(D) 360

a cascade are 10dB and 5dB. The resultant gain is:
(A) 50dB
(B) 5dB
(C) 15dB
(D) 2dB

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37. An RC circuit is fed by a 1V DC source. After switching on, the steady-state voltage
across the capacitor in volt is:
(A) 0

(D) 1
38. If H(s)= , then h(t) = ?

(A) 10e
(B) 10 e5t
(C) e
(D) e5t

(A) unit step
(B) impulse
(C) ramp
(D) paraboloid
40. When voltage sources are connected in series, voltages add. What happens to current
when two current sources are connected in series?
(A) adds
(B) differentiates
(C) multiplies
41. The power delivered to a load by a source is equal to VI when there is no phase
difference between the voltage and current. However, the presence of reactive
elements introduces phase difference between the voltage and current which reduces
the power delivered by the source to the load. What is the formula to calculate the
power delivered in case of the presence of phase difference?
(A) VIcos
(B) VIsin
(C) VItan

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4
(A) DC
(B) AC
(C) both

case of a point charge, inversely with distance in the case of line charge distribution,
and independent of distance in the case of planar charge distribution. Which type of
source do you think is better for lighting a room?
(A) point
(B) line
(C) planar

the boundary with which polygon?
(A) rectangle
(B) trapezoid
(C) square
(D) triangle
45. A quarter-wavelength monopole antenna is used to receive an FM signal at 100 MHz.
What is the physical length of the antenna in meter?
(A) 3
(B) 1.5
(C) 0.75
(D) 0.25
46. A dipole antenna is a metallic structure that is used to receive RF signals. It is made
hollow to save material. Which phenomenon is responsible for this:

(B) skin effect
(C) refraction
(D) total internal re

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47. In an inductive circuit, what happens when frequency increases?

(A) inductance decreases

(B) inductance increases

(C) inductive reactance increases

(D) inductive reactance decreases

(A) 0

(C) 1

49. A bipolar junction transistor acts as a switch in the:

(A) saturation region and cutoff region

(B) saturation region and active region

(C) cutoff region and active region

(D) active region and break down region

50. How many valence shell electrons are there in semiconductor atoms?

(A) 16

(B) 8

(C) 4

(D) 2

51. In a transistor, a large current is controlled by a small voltage or current. Which
among the following is a current-controlled transistor:

(A) MOSFET

(B) BJT

(C) JFET

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can be split into two grounded elements with corresponding impedances. Which
theorem states this?

(A) Miller’s theorem

(B) Reciprocity Theorem

(C) Norton’s Theorem

(D) Thevenin’s Theorem

(A) intrinsic semiconductor
(B) extrinsic semiconductor
(C) metal
(D) insulator
54. If the velocity of an electromagnetic wave is c in a vacuum. What will be the velocity
in a medium whose dielectric constant is 4?
(A) c
(B) c/2
(C) 2c
55. The complete three-dimensional arrangement of particles within a crystal is known
as the _____, while the smallest repeating unit in the lattice is called the _____.
(A) unit cell, atom
(B) crystal structure, unit cell
(C) crystal structure, molecule
(D) lattice, element
56. A rectangular pulse in the time domain is a ______ function in the frequency domain.
(A) rectangular
(B) sinc
(C) triangular
(D) contant

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57. The information content of an event with a probability of occurrence 100% in bits is:
(A) 0
(B) 1

58. An AM signal is detected using an envelope detector. The carrier and modulating
signal frequencies are 1MHz and 2kHz, respectively. An appropriate value for the
time constant (in microseconds) of the envelope detector is:
(A) 0.2
(B) 1
(C) 20
59. Writing a program is easier than debugging. Which of the following programming
language offers better-debugging capability?
(A) C++
(B) C
(C) assembly Language
(D) machine Language
60. Usually, 1 Giga=1000Mega. In the case of computer memory, one GigaByte means:
(A) 1000 MegaByte
(B) 1024 MegaByte
(C) 9024 MegaByte
(D) None of these

the_____________of the notch.
(A) left
(B) right
(C) bottom-left
(D) bottom-right

W-Electronic Science-50 13 P.T.O.

is:
(A) 2
(B) -2
(C) 1
(D) -1
63. Which is a programmable logic device?
(A) CPLD
(B) FPGA
(C) PROM
(D) All of the above
64. For stability of a system, the poles of its transfer function should always lie in the:
(A) left of s-plane
(B) right of s-plane
(C) both planes are allowed
65. The Zener diode serves as a voltage regulator because it maintains a relatively
constant voltage across it when _______.

(A) forward biased

(B) no bias

(C) reverse biased

66. The requirement for a logic gate to be able to drive many other logic gates is:

(A) low output impedance, low input impedance

(B) high output impedance, high input impedance

(C) high output impedance, low input impedance

(D) low output impedance, high input impedance

W-Electronic Science-50 14

67. Which gate can be called an anti-coincidence and coincidence gate, respectively?

(A) XNOR and XOR

(B) AND and OR

(C) OR and AND

(D) XOR and XNOR

68. An instrument that is found at the center of a Wheatstone bridge is:

(A) ammeter

(B) galvanometer

(C) voltmeter

(D) rheostat

(A) light spreading ability

(B) light-collecting ability

(C) light output from an external shield

(D) light leakage ability

in dB is:

(A) 3.7

(B) 370

(C) 27

(D) 47

*****

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ROUGH WORK

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