HIGHLIGHTED-Microwave-Communications.pdf

D reduce the noise figure 206 the attenuator is used

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d) reduce the noise figure 206. The attenuator is used in the travelling-wave tube to a) help bunching b) prevent oscillations c) prevent saturation d) increase the gain 207. A magnetron is used only as a) amplifier b) oscillator c) mixer d) frequency multiplier 208. A backward-wave oscillator is based on the a) rising-sun magnetron b) crossed-field amplifier c) coaxial magnetron d) traveling-wave tube 209. Stripline and microstrip transmission lines are usually made with a) coax b) parallel lines c) twisted pair d) PCBs 210. Which of the following is not a microwave tube? a) Traveling-wave tube
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b) Cathode-ray tube c) Klystron d) Magnetron 211. Indicate which is not true. Compared with other types of radar, phased array radar has the following advantages a) very fast scanning b) ability to track and scan simultaneously c) circuit simplicity d) ability to track many targets simultaneously 212. Given the frequency and dimensions of 5 GHz and 7 cm by 9 cm respectively, the beam of the pyramidal horn is about ______. a) 27 degrees b) 53 degrees c) 60 degrees d) 80 degrees 213. The diameter of a parabolic reflector should be at least how many wavelengths at the operating frequency? a) 1 b) 2 c) 5 d) 10 214. A type of microwave repeater where the received RF carrier is down-converted to an IF frequency, amplified filtered and further demodulated to baseband. a) RF repeater b) IF repeater c) baseband repeater d) radio repeater 215. In order to reduce cross-sectional dimensions, the waveguide to use is a) circular b) ridged c) rectangular d) flexible 216. Indicate which one of the following applications or advantages of radar beacons is false: a) target identification b) navigation c) very significant extension of the maximum range d) more accurate tracking enemy targets 217. Refers to more than one transmission path or method of transmission available between transmitter and a receiver. a) diversity b) polarization c) efficiency d) accuracy 218. A solution to the “blind speed” problem is to a) change the Doppler frequency b) vary the RF c) use monopulse d) use MTI 219. A direct path that exist between the transmit and receive antennas a) LOS b) direct waves c) space waves d) terrestrial waves 220. The function of the quartz delay line in an MTI radar is to a) help in subtracting a complete scan from the previous scan b) match the phase of the coho and the stalo c) match the phase of the coho and the output oscillator d) delay a sweep so that the next sweep can be subtracted from it 221. Type of diversity where it modulates two different RF carrier frequencies with the same IF intelligence, then transmitting both RF signals to a given destination.
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