3-62. Internal arcing in a waveguide is usually a symptom of which of the following conditions?
- Change in mode
- Electrolysis at a joint
- Moisture in the waveguide
- Gradual change in frequency
3-63. What is the primary purpose of a directional coupler?
- To sample the energy in a waveguide
- To change the phase of the energy in the waveguide
- To change the direction of energy travel in the waveguide
- To allow energy in the waveguide to travel in one direction only
3-64. What is the electrical distance between. the two holes in a simple directional coupler?
- 1/8 wavelength
- 1/4 wavelength
- 1/2 wavelength
- 3/4 wavelength
3-65. Of the following characteristics, which is NOT required for a device to be considered a resonant cavity?
- Be enclosed by conducting walls
- Possess resonant properties
- Contain oscillating electromagnetic fields
- Be round or elliptical in shape
3-66. What property gives a resonant cavity a narrow bandpass and allows very accurate tuning?
- Low Q
- High Q
- Inductive reactance
- Capacitive reactance
3-67. What factor(s) determine(s) the primary frequency of a resonant cavity?
- Size only
- Shape only
- Size and shape
- Q of the cavity
3-68. Tuning is the process of changing what property of a resonant cavity?
- The Q
- The power
- The cutoff frequency
- The resonant frequency
3-69. What are the two basic types of waveguide T junctions?
- H and T
- H and E
- Hybrid Ring and magic T
- Q and magic T
3-70. A waveguide junction in which the arm area extends from the main waveguide in the same direction as the electric field is an example of what type junction?
- E-type T
- H-type T
- H-type T junction
- H-type junction
3-71. Low power handling capabilities and internal power losses are the primary disadvantages of which of the following junctions?
- Magic T
- Rat race
- Duplexer
- Hybrid ring
3-72. The hybrid ring is usually used as what type of device in radar systems?
- Mixer
- Detector
- Duplexer
- Impedance matcher
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