GATE EC question library

Practise GATE EC Electronics and Communication previous year questions free. Browse by subject, syllabus topic, year and question type, with answers and available solutions.

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SubjectTopicYearType

The number of comparators in a

4

bit flash

\text{ADC}

The circuit of the figure represents a

If the diameter of a

\frac{\lambda}{2}

dipole antenna is increased

\operatorname{from} \frac{\lambda}{100}

\frac{\lambda}{50}

, then its

The frequency range for satellite communication is

\text{TEM}

wave is incident normally upon a perfect conductor. The

\mathrm{E}

and

\mathrm{H}

fields at the boundary will be, respectively,

The magnitudes of the open-circuit and short-circuit input impedance of a transmission line are

100 \; \Omega

and

25 \; \Omega

respectively. The characteristic impedance of the line is,

In the

8085

microprocessor, the

\text{RST6}

instruction transfers the program execution to the following location:

For the logic circuit shown in the figure is the required input condition

(A, B, C)

to make the output

(X)=1

The most commonly used amplifier in sample and hold circuits is

The number of hardware interrupts (which require an external signal to interrupt) present in an

8085

microprocessor are

8

bit successive approximation analog to digital converter has full scale reading of

2.55 \mathrm{~V}

and its conversion time for an analog input of

1 \mathrm{~V}

20 \; \mu \mathrm{s}

. The conversion time for a

2 \mathrm{~V}

input will be

The amplitude modulated wave form

s(t)=A_{c}\left[1+K_{a} m(t)\right] \cos \omega_{c} t

is fed to an ideal envelope detector. The maximum magnitude of

\mathrm{K}_{0} m(t)

is greater than

1

. Which of the following could be the detector output?

A system with an input

x(t)

and output

y(t)

is described by the relation.

y(t)=t x(t)

. This system is

The Fourier Transform of the signal

x(t)=\mathrm{e}^{-3 \mathrm{t}^{2}}

is of the following form, where

A

and

B

are constants

Assume that the

\text{on-amp}

of the figure is ideal. If

\text{vi}

is a triangular wave, then

\text{vo}

will be

The configuration of given figure is a

If the

\text{op-amp}

in figure is ideal, then

v_{0}

An amplifier with resistive negative feedback has two left half plane poles in its open-loop transfer function. The amplifier

The current gain of a bipolar transistor drops at high frequencies because of

Introducing a resistor in the emitter of a common amplifier stabilizes the

\text{dc}

operating point against variations in