GATE ECE topic:communication-engineering PYQs & Answers — Page 3

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topic:communication-engineering

Questions 21–30 of 715. Imported answers require independent review unless marked reviewed.

Topic practice 715 questionsPage 3 of 72

Consider the Friis’ transmission equation

, where

and

are the received and the transmitted powers, respectively.

and

are the gain of transmitting and receiving antennas, respectively,

is the distance between the transmitting and receiving antennas, and

is the wavelength in free space.

Given:

and

Choose the distance (D), in km, from the following options at which the received power,

Your answerChoose one option.

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Consider a discrete memoryless source with an alphabet of four source symbols.

is a multi-level (-1, 0, +1, +2) signal representing a long sequence of random symbols from the above source which is generating

symbols per second.

Which of the following options is the correct value of equivalent Nyquist bandwidth of

Your answerChoose one option.

10 kHz

64 kHz

5 kHz

20 kHz

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The relation between the input current (I) and the output voltage (V) of a circuit is governed by the equation:

. The circuit is excited by

, where q is a real valued constant. At

Which of the following is an equivalent representation of the above case?

Your answerChoose one option.

, with

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The electric field of a monochromatic plane wave traveling in a lossless isotropic and homogenous medium is given by

in a right-handed orthogonal co-ordinate system.

Which of the following is the correct polarization of the electromagnetic wave?

Your answerChoose one option.

Right-handed circularly polarized

Left-handed circularly polarized

Linearly polarized

Linearly polarized with −45° angle to

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Consider a p-n junction diode when it is forward biased with 2 V.

Which of the following is/are the correct magnitude(s) of the energy difference between quasi Fermi-levels,

in the n-side and

in the p-side?

Your answerSelect all correct options. You can choose more than one.

2 eV

1 eV

2 V

1 V

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Consider the matrix

. Which of the following options is/are TRUE if

Your answerSelect all correct options. You can choose more than one.

and

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A binary ripple counter is designed to count

. Which of the following is/are the number of flip-flops required to design the counter?

Your answerSelect all correct options. You can choose more than one.

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Which option(s) represents/ represent the dielectric loss tangent of a substrate?

Your answerSelect all correct options. You can choose more than one.

Ratio of the real to imaginary parts of the total displacement current

Ratio of the electric susceptibility to permittivity

Ratio of the polarization vector

to the displacement vector

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Figure shows the output characteristics of two different Bipolar Junction Transistors (BJT), BJT 1 with magnitude of Early voltage

, and BJT 2 with magnitude of Early voltage

. Which of the following options is/are correct regarding the Early voltages?

Diagram for Electronics and Communication Engineering question 29

Your answerSelect all correct options. You can choose more than one.

is infinitely large

is finite

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The output voltage

(in Volt) for the network given in the Figure is __. (rounded off to two decimal places)

Diagram for Electronics and Communication Engineering question 30

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GATE ECE topic:communication-engineering PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30