7 1-55. For a device to be considered a resonant cavity, it must fulfill which of the following requirements? 1. Be enclosed by conducting walls 2. Possess resonant properties 3. Contain oscillating electromagnetic fields 4. All of the above 1-56. What property gives a resonant cavity a narrow bandpass and allows very accurate tuning? 1. Low Q 2. High Q 3. Inductive reactance 4. Capacitive reactance1-57. What factor(s) determines the primary frequency of a resonant cavity? 1. Size only 2. Shape only 3. Size and shape 4. Q of the cavity 1-58. Tuning is the process of changing what property of a resonant cavity? 1. The Q 2. The power output 3. The cutoff frequency4. The resonant frequency1-59. An adjustable slug or screw placed in the area of maximum E lines in a resonant cavity provides what type of tuning? 1. Volume 2. Inductive 3. Resistive 4. Capacitive 1-60. What are the two basic types of waveguide T junctions? 1. H-type and T-type 2. H-type and E-type 3. H-type and magic T 4. E-type and magic T 1-61. 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? 1. E-type magic T 2. H-type magic T 3. H-type T junction 4. E-type T junction Figure 1C.—H-type T junction. IN ANSWERING QUESTION 1-62, REFER TO FIGURE 1C. 1-62. When an input is fed into the "b" arm in the figure, which of the following output signal arrangements is/are available? 1. Out-of-phase signals from arms "a" and "c" 2. In-phase signals from arms "a" and "c" 3. An output from the "a" arm only 4. An output from the "c" arm only
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