Electronics and Communication Engineering - Microwave Communication

46. 

Assertion (A): Two equal and opposite travelling waves result in a standing wave.

Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR.

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 B

Explanation:

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47. 

When a wave reaches an open circuit

A. the voltage at termination is doubled the incident voltage
B. the current at termination is doubled the incident voltage
C. the voltage at termination is zero
D. both V and I at termination are doubled the incident voltage and current

Answer: Option A

Explanation:

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48. 

Assertion (A): In circular waveguide the attenuation of TE01 mode decreases as the operating frequency increases.

Reason (R): The wall currents in a circular waveguide in TEQ1 mode are completely circumferential.

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 B

Explanation:

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49. 

Consider the following statements

  1. Usable bandwidth of ridge wave guide is more than that of rectangular waveguide.
  2. For a given value of TM10 cutoff frequency the cross section of ridge wave guide is lesser that that of rect angular waveguide.
  3. Ridge wave guide has higher conductor losser than a rectangular waveguide.
  4. Ridge guide has higher conductor losser than a rectangular waveguide.
Which of the above statements are correct?

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

Answer: Option B

Explanation:

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50. 

Directive gain of elementary doublet is

A. 100
B. 10
C. 1.5
D. 0.5

Answer: Option C

Explanation:

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