Electronics and Communication Engineering
GATE ECE format:mcq PYQs
Build your understanding with focused practice from past exam papers.
Questions 401–410 of 426. Imported answers require independent review unless marked reviewed.
Question 50
Open questionECMCQ2 marksNeeds review
In binary frequency shift keying (FSK), the given signal waveforms are
, and
,
where
is the bit-duration interval and
is in seconds. Both
and
are zero outside the interval
. With a matched filter (correlator) based receiver, the smallest positive value of
(in milliseconds) required to have
and
uncorrelated isYour answerChoose one option.
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Open questionECMCQ2 marksNeeds review
Let
be a wide sense stationary random process with the power spectral density
as shown in Figure (a), where
is in Hertz (Hz).
The random process
is input to an ideal lowpass filter with the frequency response
as shown in Figure (b).
The output of the lowpass filter is
.Let
be the expectation operator and consider the following statements:I.
II.
III.
Select the correct option:
Your answerChoose one option.
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Open questionECMCQ2 marksNeeds review
Consider a binary memoryless channel characterized by the transition probability diagram shown in the figure.
The channel is
Your answerChoose one option.
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Open questionECMCQ2 marksNeeds review
The expression for an electric field in free space is
, where
represent the spatial coordinates,
represents time, and
are constants. This electric fieldYour answerChoose one option.
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Open questionECMCQ2 marksNeeds review
Standard air-filled rectangular waveguides of dimensions
cm and
cm are designed for radar applications. It is desired that these waveguides operate only in the dominant
mode with the operating frequency at least 25% above the cutoff frequency of the
mode but not higher than 95% of the next higher cutoff frequency. The range of the allowable operating frequency
isYour answerChoose one option.
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Open questionECMCQ2 marksNeeds review
A half wavelength dipole is kept in the
-
plane and oriented along 45° from the
-axis. Determine the direction of null in the radiation pattern for
. Here the angle
(
) is measured from the z-axis, and the angle
(
) is measured from the x-axis in the
-
plane.Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
She has a sharp tongue and it can occasionally turn ________.
Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
The ninth and the tenth of this month are Monday and Tuesday ______________.
Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
I ________ made arrangements had I ________ informed earlier.
Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
It is ____________ to read this year’s textbook ____________ the last year’s.
Your answerChoose one option.
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