# Electronics and Communication Engineering - Microwave Communication

### Exercise :: Microwave Communication - Section 8

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)

Explanation:

No answer description available for this question. Let us discuss.

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

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

Explanation:

No answer description available for this question. Let us discuss.

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

Explanation:

No answer description available for this question. Let us discuss.

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