# Electronics and Communication Engineering - Microwave Communication

### Exercise :: Microwave Communication - Section 8

51.

In a microwave resistor the wall thickness is made as small as possible to

 A. have high value of R B. have low value of R C. minimize capacitive effect D. reduce inductance

Explanation:

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52.

In a klystron amplifier the transit time of electron passing the gap in the cavity should be

 A. less than one cycle B. less than half cycle C. less than quarter cycle D. more than quarter cycle

Explanation:

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53.

In a cable with ∈r = 4, the wave velocity is

 A. 3 x 108 m/s B. 0.75 x 108 m/s C. 1.5 x 108 m/s D. 108 m/s

Explanation:

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54.

In a backward wave oscillator the efficiency

 A. is much higher than in TWT B. is much lower than in TWT C. is almost the same as in TWT D. either (a) or (b)

Explanation:

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55.

Consider the following statements

3. Fading is small when a good optical path is present.
Which of the above statements are correct?

 A. 1, 2 and 3 B. 1 and 2 only C. 1 and 3 only D. 2 and 3 only