In which mode of circular waveguide does the attenuation continuously decrease a

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Question
In which mode of circular waveguide does the attenuation continuously decrease as frequency is increased?
Options
A. TE₀₁
B. TE₁₁
C. TE₀₅
D. TE₂₁

Correct Answer

TE₀₁

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1. Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2a x a
Options
A. critical wavelength for TE₁₀ mode is the same as that for TE₀₂ mode
B. critical wavelength for TE₁₀ mode is one half of that for TE₁₀ mode
C. critical wavelength for TE₁₀ mode is the same as that for TM₁₀ mode
D. critical wavelength for TE₁₀ mode is double that for TE₀₁mode

2. The first and second subscripts in models of circular waveguides depict
Options
A. the number of full sine wave variations in circumference in direction and Bessel function variations in radial direction respectively
B. the Bessel function variations in radial direction and the number of full sine wave variations in circumference direction respectively
C. the Bessel function variations in circumference direction and number of full sine wave variations in radial direction respectively
D. none of the above

6. As regards rectangular and circular waveguides
Options
A. both have infinite set of TE and TM modes
B. rectangular waveguide has infinite TE and TM modes but not the circular waveguide
C. circular waveguide has infinite TE and TM modes but not the rectangular waveguide
D. none of the above

7. Consider the following statements about instrument landing system of aircraft
1. It ensures correct landing under conditions of low visibility.
2. It consists of runaway localizer, glide path equipment and marker beacons.
3. It is basically a blind landing system.
Which of above statements are correct?
Options
A. All
B. 1 and 2 only
C. 1 and 3 only
D. 2 only

8. For air filled circular waveguides
Options
A. the attenuation due to imperfect conducting walls is negligible
B. the attenuation due to imperfect dielectric is negligible
C. both the attenuation i.e. due to imperfect conducting walls and due to imperfect dielectric are significant
D. the total attenuation is almost zero

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