HIGHLIGHTED-Microwave-Communications.pdf

Receiver to operate from the same antenna with

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receiver to operate from the same antenna with virtually no interaction. This circuit may be replaced by a (an) A. loss waveguide B. circulator C. isolator D. gyrator 56. Which of the following frequencies are used by a class-C Emergency Position-Indicating Radio Beacon (E.P.I.R.B)?
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A. 156.65 MHz B. 121.5 MHz C. 156.76 MHz and 156.8 MHz D. All of these 57. The repetition rate of a pulsed radar system indicates the A. Frequency of the range-marker oscillator B. Reciprocal of the duty cycle C. Number of target echoes received on one second D. Frequencies of the duty cycle 58. The radar set, sensitivity-time control circuit A. Controls the width of the magnetron pulse B. Is used to increase sea return C. Can reduce sea-return response D. Discriminates between targets that are very close together. 59. Which of the following is the ferrite device that buffers a microwave source from the effects of a varying load, and thereby prevents the formation of standing waves? A. Circulator B. Duplexer C. Isolator D. Diplexer 60. Pulsed radar sets are primarily used to find the A. Target’s range and bearing B. Size and speed of a target C. Speed and course of a target D. Target’s range of speed 61. Which of the following factors is mainly concerned in the design of an antenna system for pulsed radar set? A. Duty cycle B. Radio frequency C. Pulse frequency D. Pulse length 62. In a radar set receivers, an ac AFC system may be used to A. Automatically maintain the correct magnetron frequency B. Keep the IF stages on frequency C. Maintain the desired klystron frequency D. Provide automatic control of receiver gain 63. The input signal is introduced into the traveling- wave tube at the A. Cathode B. Anode C. Cathode end of the helix D. Collector end of the helix 64. The display on the PPI scope of a radar set will have greater intensity under the following conditions A. Higher antenna rotation speeds B. Lower pulse repetition rate C. Lower antenna rotation speeds D. Both lower antenna rotation speeds and higher pulse repetition 65. The operating frequency of loran C lies within the A. LF band B. VLF band C. MF band D. HF band 66. The PPI tubes have an aquadag coating on the inside of the tube. The purpose of this coating is A. To act as the second anode B. To shield the tube magnetically C. To decelerate the electron beam D. To deflect the electron beam 67. A traveling-wave tube Is used at frequencies in the order of A. 30 MHz B. 300 MHz C. 8000 MHz D. 100 MHz 68. The main benefit of using microwaves is
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A. Lower-cost equipment B. Simpler equipment C. Greater transmission distances D. More spectrum space for signals 69. Radio communication are regulated in the Philippines by the A. DOTC B. KBP C. NTC D. Department of Defense 70. Which of the following is not a disadvantage of microwaves?
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