Electronics and Communication Engineering - Microwave Communication

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

Answer: Option C

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

Answer: Option C

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

Answer: Option C

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)

Answer: Option C

Explanation:

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55. 

Consider the following statements

  1. Fading of signals is generally greatest near radio horizon.
  2. Fading of signals is generally greatest in shadow zone.
  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

Answer: Option A

Explanation:

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