Electromagnetic Field Thoery - ECE Questions and Answers

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In a uniform plane wave E and H are related by

E/H = 1

E/H = ε/μ

E/H = μ/ε

none of the above

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Antenna beamwidth is

measure of directivity

measure of angle

measure of radiation pattern

measure of power pattern

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The pure capacitor connected across an A.C. voltage consumed 20 W. This is due to

the capacitive reactance in ohms

the current flowing in the capacitor

the fused capacitor was a big one

none of the above

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A dominant wave is characterised by which of the following?

No attenuation

Lowest cut off wavelength

Highest cut off wavelength

All of the above

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The cut off wavelength λ_c for TE₂₀ mode for a standard rectangles waveguide is

2/a

2a²

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F₂ layer of atmosphere extends from

250 km to 400 km

150 km to 250 km

50 km to 150 km

15 km to 50 km

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Whereas resonant antenna is bidirectional, non-resonant antenna is unidirectional.

True

False

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In radar system if the antenna diameter is increased by a factor of 4, the minimum range will increased by a factor of

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Which of the following antennas is λ /4 length?

Dipole

Marconi

Monopole

Parabolic