Electronics and Communication Engineering - Microwave Communication

46. 

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

A. True
B. False

Answer: Option A

Explanation:

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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

Answer: Option A

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

Answer: Option C

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

Answer: Option B

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

Answer: Option B

Explanation:

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