3-31. In practical applications, which of the following dimensions describes the wide dimension of the waveguide at the operating frequency?
- 0.1 wavelength
- 0.2 wavelength
- 0.5 wavelength
- 0.7 wavelength
3-32. Which of the following fields is/are present in waveguides?
- E field only
- H field only
- E and. H fields
- Stationary fields
3-33. A difference in potential across a dielectric causes which of the following fields to develop?
- Electric only
- Magnetic only
- Electromagnetic
3-34. H lines have which. of the following distinctive characteristics?
- They are continuous straight lines
- They are generated by voltage
- They form closed loops
- They form only in the waveguide
3-35. For an electric field to exist at the surface of a conductor, the field must have what angular relationship to the conductor?
- 0°
- 30°
3 45° 4 90°
3-36. If the wall of a waveguide is perfectly flat, the angle of reflection is equal to which of the following angles?
- Cutoff
- Incidence
- Refraction
- Penetration
3-37. The cutoff frequency in a waveguide occurs at exactly what angle of reflection?
- 10°
- 30°
- 45°
- 90°
3-38. How does the group velocity of an electromagnetic field in a waveguide compare to the velocity of a wavefront through free space?
- Group velocity is somewhat faster
- Group velocity is somewhat slower
- Group velocity is twice that of free velocity
- Free velocity is twice that of group velocity
3-39. The group velocity of a wavefront in a waveguide may be increased by which of the following actions?
- Decreasing the frequency of the input energy
- Increasing the frequency of the input energy
- Increasing the power of the input energy
- Decreasing the power of the input energy
3-40. The various field configurations that can exist in a waveguide are referred to as
- wavefronts
- modes of operation
- fields of operation
- fields of distribution
3-41. The most efficient transfer of energy occurs in a waveguide in what mode?
- Sine
- Dominant
- Transverse
- Time-phase
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