GATE ECE topic:electronics PYQs & Answers — Page 19

Questions 181–190 of 715. Imported answers require independent review unless marked reviewed.

In the circuit shown below, the transistors

and

are biased in saturation. Their small signal transconductances are

and

respectively. Neglect body effect, channel length modulation and intrinsic device capacitances.

Diagram for Electronics and Communication Engineering question 51

Assuming that capacitor

is a short circuit for AC analysis, the exact magnitude of small signal voltage gain

is ______.

Your answerChoose one option.

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Which of the following statements is/are true for a BJT with respect to its DC current gain

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

Under high-level injection condition in forward active mode,

will decrease with increase in the magnitude of collector current.

Under low-level injection condition in forward active mode, where the current at the emitter-base junction is dominated by recombination-generation process,

will decrease with increase in the magnitude of collector current.

will be lower when the BJT is in saturation region compared to when it is in active region.

A higher value of

will lead to a lower value of the collector-to-emitter breakdown voltage.

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Consider a system

represented in state space as

. Which of the state space representations given below has/have the same transfer function as that of

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

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Let

, and

be functions of

. Suppose that for every given pair of points

and

in space, the line integral

evaluates to the same value along any path

that starts at

and ends at

. Then which of the following is/are true?

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

For every closed path

, we have

There exists a differentiable scalar function

such that

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Consider the matrix

, where

is a positive real number. Which of the following vectors is/are eigenvector(s) of this matrix?

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

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The radian frequency value(s) for which the discrete time sinusoidal signal

has a period of 40 is/are _____.

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

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Let

be a random process, where amplitude

and phase

are independent of each other, and are uniformly distributed in the intervals

and

, respectively.

is fed to an 8-bit uniform mid-rise type quantizer. Given that the autocorrelation of

, the signal to quantization noise ratio (in dB, rounded off to two decimal places) at the output of the quantizer is __________.

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A lossless transmission line with characteristic impedance

is terminated with an unknown load. The magnitude of the reflection co-efficient is

. As one moves towards the generator from the load, the maximum value of the input impedance magnitude looking towards the load (in

) is ______.

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The relation between any N-length sequence

and its corresponding N-point discrete Fourier transform

is defined as

Another sequence

is formed as below

For the sequence

, the value of

is ______.

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For the two port network shown below, the value of the

parameter (in Siemens) is ______.

Diagram for Electronics and Communication Engineering question 60

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GATE ECE topic:electronics PYQs

Question 51

Question 52

Question 53

Question 54

Question 55

Question 56

Question 57

Question 58

Question 59

Question 60