Exercise: Microwave Communication

Questions for: Microwave Communication

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: B
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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: B
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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: A
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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: B
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In a TWT the phase velocity of the axial component of the field on the slow wave structure is kept
A:
equal to velocity of electron
B:
slightly less than velocity of electron
C:
slightly more than velocity of electron
D:
equal to velocity of light in free space
Answer: A
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