Microwave Communication - ECE Questions and Answers

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In a TWT the loss in attenuator is

almost equal to forward gain of tube

much less than forward gain of tube

much higher than forward gain of tube

almost infinite

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To study electromagnetic radiations from astronomical objects, radio astronomers use

low frequencies

medium frequencies

microwaves

either (a) or (b)

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Radar reciever has high sensitivity and low noise figure

True

False

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For a waveguide, which of the following statements is wrong?

It is usually made of brass or aluminium

It is usually rectangular or circular in shape

The dielectric region is usually air

The wall thickness is very small as compared to skin depth

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A transmission line discontinuity is defined as any interruption in the uniformity of the line.

True

False

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Interference generated by electrical equipment and automobile ignition systems when observed closed to earth is

horizontally polarized

vertically polarized

polarized both horizontally

not polarized

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The earliest uses of electromagnetic waves were

point to point communication

radar

both (a) and (b)

neither (a) nor (b)

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At millimeter wavelength the favoured mode in circular wave guide is

TE₀₁

TE₁₁

TE₂₀

TE₂₁

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In laboratory experiment the output from reflex klystron is moderated by square wave because

it is easy to generate a square wave

crystal diode operates in square law region of i-v characteristics

it prevents frequency modulation

detector circuit is less complicated