Electromagnetic Field Thoery - ECE Questions and Answers

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Laplace equation in cylindrical co-ordinates is given by

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Troposphere is the upper part of the Earth's atmosphere which absorbs large quantities of Sun's radiations.

True

False

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For resonant long wire antenna 'n' half wavelength long in free space, if 'n' is increased then inclination of the major lobe with wire axis will __________ .

increases

decreases

remains same

none

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The maximum effective aperture of λ/2 (half-wave) antenna is

0.013 λ²

0.13 λ²

1.3 λ²

13 λ²

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Zoning is used with a dielectric antenna in order to

permit pin-point focusing

reduce the bulk of the lens

increase the bandwidth of the lens

correct the curvature of the wavefront from a horn that is too short

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For aeroplane and navigation frequency band is

VLF

UHF

VHF

EHF

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Poynting vector signifies which of the following?

Power density vector producing electrostatic field

Power density vector producing electromagnetic field

Current density vector producing electrostatic field

Current density vector producing electromagnetic field

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Which one is correct?

Sky wave propagation (2 to 30 MHz)

Space wave propagation (> 30 MHz)

Tropospheric propagation (> 300 MHz)

All of the above

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When a magnetic circuit is compared with an electric circuit, the equivalent of the magnetic flux is

the conductivity of the lines

the voltage of the source

the current in the lines

the conductance of the load