Electronics and Communication Engineering
GATE ECE branch:ec PYQs
Build your understanding with focused practice from past exam papers.
Questions 691–700 of 715. Imported answers require independent review unless marked reviewed.
Question 53
Open questionECNAT2 marksNeeds review
An electron (
) is moving in free space with velocity
m/s towards a stationary electron (
) far away. The closest distance that this moving electron gets to the stationary electron before the repulsive force diverts its path is __________
m. [Given, mass of electron
kg, charge of electron
C, and permittivity
F/m]Log in to check the answer
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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 questionECNAT2 marksNeeds review
The permittivity of water at optical frequencies is
. It is found that an isotropic light source at a distance
under water forms an illuminated circular area of radius 5 m, as shown in the figure. The critical angle is
. 
The value of
(in meter) is __________Log in to check the answer
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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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Open questionGAMCQ1 markNeeds review
In the summer, water consumption is known to decrease overall by 25%. A Water Board official states that in the summer household consumption decreases by 20%, while other consumption increases by 70%.
Which of the following statements is correct?
Your answerChoose one option.
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