Electromagnetic Field Thoery - ECE Questions and Answers

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The current distribution along a travelling wave antenna can be written in the form

f(z) = f₀e^-jβ_z

f(z) = f₀ sin β_z

f(z) = f₀

f(z) = f₀ cos (ωt - β_z)

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The characteristic impedance of loss less transmission line is

L/R

L/C

1/LC

C/L

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For a hollow waveguide, the axial current must necessarily be

combination of conduction and displacement current

conduction current only

time varying conduction current and displacement current

displacement current only

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Industrial heating furnaces such as arc and induction furnaces operate on __________ power factor

low leading

low lagging

high leading

very low lagging

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The magnetic field due to current I equals

I/2 pr

I/4 pr

I²/2 pr

I²/4 pr

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VLF is generally used for

telegraphy

satellite communication

instrument landing system

all of the above

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In electromagnetic wave polarization is caused by

refraction

reflection

longitudinal nature of electromagnetic waves

transverse nature of electromagnetic waves

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In a rectangular waveguide if operating frequency is greater than cut off frequency then propagation constant is

purely real

purely imaginary

equal to unit

a complex number

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Isotropic radiator is one that radiates energy

uniformly in all direction

inside a hollow sphere

in a well defined isotropic direction

none of the above