HIGHLIGHTED-Microwave-Communications.pdf

A higher cost equipment b line of sight transmission

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A. Higher-cost equipment B. Line-of-sight transmission C. Conventional components are not usable D. Circuits are more difficult to analyze 71. Which of the following is a microwave frequency? A. 1.7 MHz B. 750 MHz C. 0.98 GHz D. 22 GHz 72. Which of the following is not a common microwave application? A. Radar B. Mobile radio C. Telephone D. Satellite communications 73. Coaxial cable is not widely used for long microwave transmission lines because of its A. High loss B. High cost C. Large size D. Excessive radiation 74. Stripline and microstrip transmission lines are usually made with A. Coax B. Parallel wires C. Twisted pair D. PCBs 75. The most common cross section of a waveguide is a A. Square B. Circle C. Triangle D. Rectangle 76. A rectangular waveguide has a width of 1 inch and a height of 0.6 in. Its cutoff frequency is A. 2.54 GHz B. 3.0 GHz C. 5.9 GHz D. 11.8 GHz 77. A waveguide has a cutoff frequency of 17 GHz. Which of the following signals will not be passed by the waveguide? A. 15 GHz B. 18 GHz C. 22 GHz D. 255 GHz 78. Signal propagation in a waveguide is by A. Electrons B. Holes C. Electric and magnetic fields D. Air pressure 79. When the electric field in a waveguide is perpendicular to the direction of wave propagation, the mode is said to be A. Vertical polarization B. Horizontal polarization C. Transverse electric D. Transverse magnetic 80. The dominant mode in most rectangular waveguide is A. TE 1.0 B. TE 1.2 C. TM 0.1
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D. TM 1.1 81. A magnetic field is introduced into waveguide by a A. Probe B. Dipole C. Stripline D. Capacitor 82. A half-wavelength, close section of a waveguide that acts as a parallel resonant circuit is known as a(n) A. Half-wave section B. Cavity resonator C. LCR circuit D. Directional coupler 83. Decreasing the volume of a cavity causes its resonant frequency to A. Increase B. Decrease C. Remain the same D. Drop to zero 84. __________ is a popular microwave mixer diode. A. Gunn B. Varactor C. Hot carrier D. IMPATT 85. Varactor and step-recovery diodes are widely used in what type of circuit? A. Amplifier B. Oscillator C. Frequency multiplier D. Mixer 86. Which diode is a popular microwave oscillator? A. IMPATT B. Gunn C. Varactor D. Schottky 87. Which type of diodes does not ordinarily operate with reverse bias? A. Varactor B. IMPATT C. Snap-off D. Tunnel 88. Low-power Gunn diodes are replacing A. Reflex klystrons B. TWTs C. Magnetrons D. Varactor diodes 89. Which of the following is not a microwave tube? A. Traveling-wave tube B. Cathode-ray tube C. Klystron D. Magnetron 90. In a klystron amplifier, velocity modulation of the electron beam is produced by the A. Collector B. Catcher cavity C. Cathode D. Buncher cavity 91. A reflex klystron is used as a(n) A. Amplifier B. Oscillator C. Mixer D. Frequency multiplier 92. For proper operation, a magnetron must be
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