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Recent questions and answers in Electromagnetics
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1
GATE2017 EC2: 54
Standard airfilled rectangular waveguides of dimensions a =2.29 cm and b=1.02 cm are designed for radar applications. It is desired that these waveguides operate only in the dominant TE$_{10}$ mode with the operating frequency at least 25% above the cutoff frequency of the TE$_{10}$ mode but not ... .1 GHz 8.19 GHz ≤ f ≤ 12.45 GHz 6.55 GHz ≤ f ≤ 13.1 GHz 1.64 GHz ≤ f ≤ 10.24 GHz
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Nov 25, 2017
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Electromagnetics
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gate2017ec2
waveguides
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2
GATE2017 EC2: 55
The permittivity of water at optical frequencies is 1.75 $\varepsilon _0$. It is found that an isotropic light source at a distance d under water forms an illuminated circular area of radius 5 m, as shown in the figure. The critical angle is $\Theta _c$. The value of d (in meter) is _______________
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Nov 25, 2017
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Electromagnetics
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gate2017ec2
wavesandproperties
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3
GATE2017 EC2: 24
Two conducting spheres S1 and S2 of radii $a$ and $b$ ($b>a$ ... $V_a=V_b$ and $E_a<E_b$ $V_a>V_b$ and $E_a>E_b$ $V_a=V_b$ and $E_a>E_b$ $V_a>V_b$ and $E_a=E_b$
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Nov 23, 2017
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Electromagnetics
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gate2017ec2
0
votes
0
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4
GATE2017 EC2: 27
An integral I over a counterclockwise circle C is given by $I=\oint _c \frac{z^21}{z^2+1} e^z dz.$ If C is defined as$z=3$ , then the value of $I$ is
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Nov 23, 2017
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Electromagnetics
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gate2017ec2
electrostatics
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5
GATE2017 EC2: 25
A twowire transmission line terminates in a television set. The VSWR measured on the line is 5.8. The percentage of power that is reflected from the television set is _________
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Nov 23, 2017
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Electromagnetics
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gate2017ec2
transmisionline
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0
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6
GATE2017 EC1: 54
The expression for an electric field in free space is , $E=E_{0}\left ( \hat{x}+\hat{y}+j2 \hat{z} \right )e^{j\left ( \omega tkx+ky \right )}$ where $x,y,z$ represent the special coordinates, $t$ represents ... wave propagating normal to the $z$axis Represents an elliptically polarized plane wave propagating along the $x$$y$ plane Represents a linearly polarized plane wave
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Nov 17, 2017
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Electromagnetics
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gate2017ec1
polarization
wavesproperties
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7
GATE2017 EC1: 51
An optical fiber is kept along the $\hat{z}$ direction. The refractive indices for the electric fields along $\hat{x}$ and $\hat{y}$ directions in the fiber are $n_{x}=1.5000$ and $n_{y}=1.5001$ ... wave is circularly polarized at the input of the fiber, the minimum propagation distance after which it becomes linearly polarized, in centimeters,is______________.
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Nov 17, 2017
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Electromagnetics
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gate2017ec1
polarization
opticalfiber
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8
GATE2017 EC1: 55
A half wavelength dipole is kept in the xy plane and oriented along 45^{o} from the xaxis. Determine the direction of null in the radiation pattern for $0\leq \phi \leq \pi$. Here the angle $\theta (0\leq \theta \leq \pi )$ is measured from the $z$ ... $\theta =45^{o},\phi =90^{o}$ $\theta =90^{o},\phi =135^{o}$ $\theta =45^{o},\phi =135^{o}$
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Nov 17, 2017
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Electromagnetics
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gate2017ec1
antennas
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9
GATE2017 EC1: 25
Consider a wireless communication link between a transmitter and a receiver located in free space, with finite and strictly positive capacity. If the effective areas of the transmitter and the receiver antennas, and the distance between them are all doubled, and everything else ... a factor of $2$ Decreases by a factor of $2$ Remains unchanged Decreases by a factor of $\sqrt{2}$
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Nov 17, 2017
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Electromagnetics
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gate2017ec1
wirelesscommunication
antennas
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10
GATE2017 EC1: 23
The voltage of an electromagnetic wave propagating in a coaxial cable with uniform characteristic impedance is $V(l)=$ $e^{\gamma l\dotplus j\omega t }Volts$, where $l$ is the distance along the length of the cable in meters, $γ=(0.1+j40)m^{1}$ ... $dB/meter$ is__________.
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Nov 17, 2017
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Electromagnetics
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2.7k
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gate2017ec1
transmissionlines
impedence
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