# Electronics and Communication Engineering - Microwave Communication

### Exercise :: Microwave Communication - Section 8

46.

A waveguide twist is used to change the plane of polarization.

 A. True B. False

Explanation:

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

47.

Consider the following statements about directional coupler shown in the figure

1. Ports 1 and 2 are decouple
2. Ports 3 and 4 are decoupled
3. Pots 1 and 3 are decoupled
4. Ports 1 and 4 are decoupled
Which of the above statements are correct?

 A. 1 and 2 only B. 3 and 4 only C. 1, 2 and 3 D. 2, 3 and 4

Explanation:

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48.

In a multicavity klystron amplifier the electron velocity of the order of

 A. 10 m/s B. 103 m/s C. 106 m/s D. 1012 m/s

Explanation:

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49.

At a frequency equal to cutoff frequency in a rectangular wave guide

 A. the flow of electromagnetic energy is zero B. the flow of electromagnetic energy is infinite C. the flow of electromagnetic energy is 50% of maximum D. the flow of electromagnetic energy is 10% of maximum

Explanation:

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50.

Two identical hybrid tees are joined as shown in the given figure. If 16 mW power is fed into port 1, the power output at ports 2 , 3, 1', 2', 3' respectively is

 A. 8, 4, 2, 2, 0 mW B. 0, 8, 4, 4, 0 mW C. 0, 8, 2, 2, mW D. 8, 2, 4, 2, 0 mW