Microwave Communication - ECE Questions and Answers

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If the minimum range of a radar is to be doubled, the peak power has to be increased by a factor of

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Which mode has the lowest cut off frequency in circular wave guides?

TE₀₁

TE₁₁

TE₂₀

TE₂₁

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Assertion (A): Klystron amplifiers use one or more intermediate cavities in addition to buncher and catcher cavity.

Reason (R): When one or more intermediate cavities are used the bandwidth can be increased.

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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A wave E_m cos (bx - ωt) is a backward wave.

True

False

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A reflex klystron oscillator is a

low power device

high power device

high efficiency device

both (a) and (b)

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Consider the following applications

TV tuning
Active filter
Microwave frequency multiplication

In which of above can a varactor diode be used?

1 2 and 3

l and 2 only

1 and 3 only

2 and 3 only

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Consider the following statements

Dissipative attenuator has a fixed value of attenuation.
Reflective attenuator has a fixed value of attenuation.
Both dissipative and reflective attenuators are available only with fixed attenuation.
Both dissipative and reflective attenuators are available with either fixed or variable attenuation.

Which of the above are correct?

1 only

1 and 2

1, 2 and 3

4 only