HIGHLIGHTED-Microwave-Communications.pdf

A polarization diversity b quad diversity c space

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a) polarization diversity
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b) quad diversity c) space diversity d) frequency diversity 222. The coho in MTI radar operates at the a) intermediate frequency b) transmitted frequency c) received-frequency d) pulse operation frequency 223. Which type of diode does not ordinarily operate with reverse bias? a) Varactor b) IMPATT c) Snapp-off d) Tunnel 224. What happens when a horn antenna is made longer? a) gain increases b) beam width decreases c) bandwidth increases d) bandwidth decreases 225. A pyramidal horn used at 5 GHz has an aperture that is 7 cm by 9 cm. The gain is about a) 10.5 dB b) 11.1 dB c) 22.6 dB d) 35.8 dB 226. Type of diversity where the output of the transmitter is fed to two or more antennas that are physically separated by an appreciable wavelengths a) quad diversity b) wavelength diversity c) space diversity d) hybrid diversity 227. The Doppler effect is used in (indicate the false statement) a) moving-target plotting on the PPI b) the MTI system c) FM radar d) CW radar 228. A type of diversity where a single RF carrier is propagated with two different electromagnetic polarization. a) space diversity b) wavelength diversity c) polarization diversity d) hybrid diversity 229. The A scope displays a) the target position and range b) the target range, but not position c) the target position, but not range d) neither range nor position, but only velocity 230. The glass tube of a TWT may be coated with aquadag to a) help focusing b) provide attenuation c) improve bunching d) increase gain 231. Type of diversity which consists of a standard frequency diversity path where the two transmitter/receiver pair at one end of the path are separated from each other and connected to different antennas that are vertically separated as in space diversity a) quad diversity b) wavelength diversity c) space diversity d) hybrid diversity 232. The biggest disadvantage of CW Doppler radar is that a) it does not give the target velocity b) it does not give the target range c) a transponder is required at the target d) it does not give the target position 233. The combination of the frequency, space, polarization and receiver diversity into one system a) hybrid diversity
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b) quad diversity c) space diversity d) wavelength diversity 234. If the target cross section is changing, the best system for accurate tracking in a) lobe switching b) sequential lobing c) conical switching d) monopulse 235. The multicavity klystron a) is not good low-level amplifier because of noise b) has a high repeller voltage to ensure a rapid transmit time c) is not suitable for pulse operation d) needs a long transmit time through the buncher cavity to ensure current modulation 236. An arrangement that avoids a service interruption during periods of deep fades or equipment failures.
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