Electronics and Communication Engineering - Microwave Communication

31. 

A directional coupler is used

A. to transmit microwave signals
B. to generate microwave signals
C. to measure amplitude and phase of a travelling wave
D. both (a) and (b)

Answer: Option C

Explanation:

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32. 

Assertion (A): In rectangular waveguide TE01 mode is just TE10 mode rotated by 90°.

Reason (R): When a rectangular waveguide is rotated by 90°, the broad and narrow dimensions get interchanged.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

Answer: Option A

Explanation:

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33. 

Consider the following statements about a magic tee

  1. The collinear arms are isolated from each other.
  2. On of the collinear arms is isolated from E arm.
  3. On of the collinear arms is isolated from H arm.
  4. E and H arms are isolated from each other.
Of the above statements

A. 1 and 2 are correct
B. 1 and 3 are correct
C. 1 and 4 are correct
D. 2 and 3 are correct

Answer: Option C

Explanation:

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34. 

Assertion (A): Hollow waveguides are frequently used as transmission lines at microwave frequencies.

Reason (R): Waveguide has high power handling capacity, low loss and simple structure.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

Answer: Option A

Explanation:

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35. 

In p mode of operation of magnetron the spikes due to phase focussing effect rotate at an angular velocity corresponding to

A. one pole/cycle
B. two pole/cycle
C. four pole/cycle
D. six pole/cycle

Answer: Option B

Explanation:

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