Electronics and Communication Engineering - Microwave Communication

1. 

Consider the following statements, SWR of a transmission line is infinite when the load is

  1. a short circuit
  2. a complex impedance
  3. an open circuit
  4. a pure reactance
Which of the above statements are correct?

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

Answer: Option A

Explanation:

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2. 

In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.

A. True
B. False

Answer: Option A

Explanation:

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3. 

The arrangement in the given figure is a hybid T. If 100 mW fed at port 1, the power reflected back at port 1 is

A. 0
B. 25 mW
C. 50 mW
D. 100 mW

Answer: Option C

Explanation:

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4. 

In TE10 mode the largest electric field in a rectangular wave guide, occurs

A. along centre line of broad wall (i.e. x = a/2)
B. along the broad wall (i.e. x = 0 and x = a)
C. either (a) or (b)
D. neither (a) nor (b)

Answer: Option A

Explanation:

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5. 

Which modes of circular wave guides have circular symmetry?

A. TE11
B. TE11 and TE21
C. TE01
D. TE01 and TM01

Answer: Option D

Explanation:

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