Microwave Communication - ECE Questions and Answers

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A loss less line of characteristic impedance Z₀ is terminated in pure reactance of -jZ₀ value. VSWR is

infinity

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In a klystron amplifier the input cavity is called

buncher

catcher

Pierce gun

collector

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In a circular waveguide the dominant mode is

TE₀₁

TE₁₁

TE₂₀

TE₂₁

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The reflection coefficient on a line is 0.2 ∠45°. The SWR is

0.8

1.1

1.2

1.5

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Microwave resonators are used in

microwave oscillators

microwave narrow band amplifier

microwave frequency metres

all of the above

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Assertion (A): TWT uses a focussing mechanism to prevent the electron beam from spreading.

Reason (R): In a TWT the electron beam has to travel a much longer distance than in klystron.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

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In a TWT the amplitude of resultant wave travelling down the helix

increases exponentially

increases linearly

decreases exponentially

is almost constant

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Which of the following is not a travelling wave?

e = E_m sin (βx - ωt)

e = E_m cos (βx - ωt)

e = E_m sin (ωt - βx)

e = E_m sin (βx)

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Both Impatt and Trapatt devices use avalanche effect

True

False