HIGHLIGHTED-Microwave-Communications.pdf

A service switching arrangement b protection

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a) service switching arrangement b) protection switching arrangement c) interruption switching arrangement d) equipment switching arrangement 237. A type of attenuator where attenuation is accomplished by insertion of a thin card of resistive material through a slot in the top of a waveguide a) flap attenuator b) vane attenuator c) slot attenuator d) directional coupler 238. After a target has been acquired, the best scanning system for tracking is a) nodding b) spiral c) conical d) helical 239. A duplexer is used a) to couple two different antennas to a transmitter without mutual interference b) to allow the one antenna to be used for reception or transmission without mutual interference c) to prevent interference between two antennas when they are connected to a receiver d) to increase the speed of pulses in pulsed radar 240. Type of protection switching arrangement where each working radio channel has a dedicated backup or spare channel a) hot swap b) hot backup c) hot standby d) hot diversity 241. If a return echo arrives after the allocated pulse interval, a) it will interfere with the operation of the transmitter b) the receiver might be overloaded c) it will not be received d) the target will appear closer than it really is 242. Points in the microwave system baseband signals either originate or terminate a) terminator b) terminal stations c) terminating equipment d) terminal equipment 243. A half wavelength, closed section of a waveguide that acts as a parallel resonant circuit is known as _____. a) half-wave section b) cavity resonator c) LCR circuit d) directional couple 244. Decreasing the volume of a cavity causes its resonant frequency to a) increase
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b) decrease c) remains the same d) drop to zero 245. The IF bandwidth of a radar receiver is inversely proportional to the a) pulse width b) pulse repetition frequency c) pulse interval d) the target will appear closer than it really is 246. Which of the following devices are not being used in microwave power amplifier? a) klystron tubes b) traveling wave tubes c) IMPATT d) magnetron 247. Which is not true? A high PRF will a) make the returned echoes easier to distinguish from noise b) make the target tracking easier with conical scanning c) increase the maximum range d) have no effect on the range resolution 248. It is a unidirectional device often made up of ferrite material used in conjunction with a channel- combining network to prevent the output from interfering with the output of another transmitter a) circulator b) magic tee c) isolator d) rat race 249. Which is not true about the following: Flat- topped rectangular pulses must be transmitted in radar to a) allow a good minimum range b) make the returned echoes easier to distinguish from the noise c) prevent frequency changes in the magnetron d) allow accurate range measurements 250. The power that leaks out of the back and sides
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