Electronics and Communication Engineering - Microwave Communication

36. 

Consider the following statements about instrument landing system of aircraft

  1. It ensures correct landing under conditions of low visibility.
  2. It consists of runaway localizer, glide path equipment and marker beacons.
  3. It is basically a blind landing system.
Which of above statements are correct?

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

Answer: Option A

Explanation:

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37. 

Effect of loading of line is

A. increase in Z0, a and β
B. increase in Z0 and β but decrease in a
C. decrease in Z0, a and β
D. decrease in Z0 and β but increase in a

Answer: Option B

Explanation:

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38. 

Which mode has the minimum cutoff frequency in rectangular wave guides?

A. TE11
B. TE10
C. TE01
D. TE20

Answer: Option B

Explanation:

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39. 

As compared to dimensions of most feeds, the skin depth at microwave frequencies is

A. of the same magnitude
B. much larger
C. much smaller
D. either (b) or (c)

Answer: Option A

Explanation:

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40. 

In microwave communication links the fading due to rain occurs. The methods to solve this problem include

A. antenna replacement and feed correction
B. amplitude trimming and phase correction
C. polarization shifting and code diversity
D. path diversity and frequency diversity

Answer: Option D

Explanation:

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