GATE ECE discipline:electrical-electronics-and-instrumentation PYQs & Answers — Page 35

Questions 341–350 of 715. Imported answers require independent review unless marked reviewed.

A bar of silicon is doped with boron concentration of

and assumed to be fully ionized. It is exposed to light such that electron-hole pairs are generated throughout the volume of the bar at the rate of

. If the recombination lifetime is 100

s, intrinsic carrier concentration of silicon is

and assuming 100% ionization of boron, then the approximate product of steady-state electron and hole concentrations due to this light exposure is

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The energy band diagram of a p-type semiconductor bar of length L under equilibrium condition (i.e., the Fermi energy level

is constant) is shown in the figure. The valence band

is sloped since doping is non-uniform along the bar. The difference between the energy levels of the valence band at the two edges of the bar is

Diagram for Electronics and Communication Engineering question 7

If the charge of an electron is q, then the magnitude of the electric field developed inside this semiconductor bar is

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In the circuit shown in the figure, the transistors

and

are operating in saturation. The channel length modulation coefficients of both the transistors are non-zero. The transconductance of the MOSFETs

and

are

and

, respectively, and the internal resistance of the MOSFETs

and

are

and

, respectively.

Diagram for Electronics and Communication Engineering question 8

Ignoring the body effect, the ac small signal voltage gain (

) of the circuit is

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For the circuit with an ideal OPAMP shown in the figure,

is fixed.

Diagram for Electronics and Communication Engineering question 9

volt for

volt and

volt for

volt, where

is measured across

connected at the output of this OPAMP, the value of

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3.285

2.860

3.825

5.555

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Consider the circuit with an ideal OPAMP shown in the figure. Assuming

and

, the condition at which

equals to zero is

Diagram for Electronics and Communication Engineering question 10

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, where

and

indicate the bases of the corresponding numbers, then

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and

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Addressing of a

memory is realized using a single decoder. The minimum number of AND gates required for the decoder is

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The block diagram of a feedback control system is shown in the figure. The transfer function

of the system is

Diagram for Electronics and Communication Engineering question 13

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The complete Nyquist plot of the open-loop transfer function

of a feedback control system is shown in the figure. If

has one zero in the right-half of the

-plane, the number of poles that the closed-loop system will have in the right-half of the

-plane is

Diagram for Electronics and Communication Engineering question 14

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Consider a rectangular coordinate system

with unit vectors

, and

. A plane wave traveling in the region

with electric field vector

is incident normally on the plane at

, where

is the phase constant. The region

is free space and the region

is filled with a lossless medium (permittivity

, permeability

, where

F/m and

H/m). The value of the reflection coefficient is

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GATE ECE discipline:electrical-electronics-and-instrumentation PYQs

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15