Electronics and Communication GATE 2023 Questions with Answer

Ques 14 Electromagnetic Theory

Consider a narrow band signal, propagating in a lossless dielectric medium (ε_r = 4, μ_r = 1), with phase velocity v_p and group velocity v_g. Which of the following statements is true? (c is the velocity of light in vacuum.)

v_p > c, v_g > c

v_p < c, v_g > c

v_p > c, v_g < c

v_p < c, v_g < c

Ques 15 Electromagnetic Theory

The S-parameters of a two port network is given as

with reference to Z_o. Two lossless transmission line sections of electrical lengths θ₁ = βl₁ and θ₂ = βl₂ are added to the input and output ports for measurement purposes, respectively. The S-parameters [S''] of the resultant two port network is

Ques 16 Electromagnetic Theory

The standing wave ratio on a 50 Ω lossless transmission line terminated in an unknown load impedance is found to be 2.0. The distance between successive voltage minima is 30 cm and the first minimum is located at 10 cm from the load. Z_L can be replaced by an equivalent length l_m and terminating resistance R_m of the same line. The value of R_m and l_m, respectively, are

R_m = 100 Ω, l_m = 20 cm

R_m = 25 Ω, l_m = 20 cm

R_m = 100 Ω, l_m = 5 cm

R_m = 25 Ω, l_m = 5 cm

Ques 17 Electromagnetic Theory

The electric field of a plane electromagnetic wave is
E = a_xC_1xcos(ωt - βz) + a_yC_1ycos(ωt - βz + θ) V/m.
Which of the following combination(s) will give rise to a left handed elliptically polarized (LHEP) wave?

C_1x = 1, C_1y = 1, θ = π/4

C_1x = 2, C_1y = 1, θ = π/2

C_1x = 1, C_1y = 2, θ = 3π/2

C_1x = 2, C_1y = 1, θ = 3π/4

Ques 18 Electromagnetic Theory

The following circuit(s) representing a lumped element equivalent of an infinitesimal section of a transmission line is/are

Ques 19 Electromagnetic Theory

A transparent dielectric coating is applied to glass (ε_r = 4, μ_r = 1) to eliminate the reflection of red light (λ_o = 0.75 μm). The minimum thickness of the dielectric coating, in μm, that can be used is ____ (rounded off to two decimal places).

0.12 is the correct answer.

Ques 20 Electronic Devices

In a semiconductor, if the Fermi energy level lies in the conduction band, then the semiconductor is known as

degenerate n-type.

degenerate p-type.

non-degenerate n-type.

non-degenerate p-type.

Ques 21 Electronic Devices

For an intrinsic semiconductor at temperature T = 0 K, which of the following statements is true?

All energy states in the valence band are filled with electrons and all energy states in the conduction band are empty of electrons.

All energy states in the valence band are empty of electrons and all energy states in the conduction band are filled with electrons.

All energy states in the valence and conduction band are filled with holes.

All energy states in the valence and conduction band are filled with electrons.

Ques 22 Electronic Devices

For a MOS capacitor, V_fb and V_t are the flat-band voltage and the threshold voltage, respectively. The variation of the depletion width (W_dep) for varying gate voltage (V_g) is best represented by

Ques 23 Electronic Devices

In the circuit shown below, V_I and V₂ are bias voltages. Based on input and output impedances, the circuit behaves as a

voltage controlled voltage source.

voltage controlled current source.

current controlled voltage source.

current controlled current source.

Ques 24 Electronic Devices

The signal-to-noise ratio (SNR) of an ADC with a full-scale sinusoidal input is given to be 61.96 dB. The resolution of the ADC is ____ bits (rounded off to the nearest integer).

11 is the correct answer.

Ques 25 Electronic Devices

In the circuit shown below, the current i flowing through 200 Ω resistor is ____ mA (rounded off to two decimal places).

0.25 is the correct answer.

Ques 26 Electronic Devices

The h-parameters of a two port network are shown below. The condition for the maximum small signal voltage gain V_out/V_s is

h₁₁ = 0, h₁₂ = 0, h₂₁ = very high and h₂₂ = 0

h₁₁ = very high, h₁₂ = 0, h₂₁ = very high and h₂₂ = 0

h₁₁ = 0, h₁₂ = very high, h₂₁ = very high and h₂₂ = 0

h₁₁ = 0, h₁₂ = 0, h₂₁ = very high and h₂₂ = very high

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Electronics and Communication GATE 2023 Questions with Answer