HIGHLIGHTED-Microwave-Communications.pdf

A magnetron b klystron c twt d bwa 368 what is the

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a) magnetron b) klystron c) TWT d) BWA 368. What is the advantage of a gridless klystron a) power input b) gain c) attenuator d) power output 369. Which vacuum tube do you think oscillate at the highest frequency a) Magnetron b) Gunn c) Klystron d) BWO 370. How would a balun be used to change 200 ohms to 50 ohms? a) use a higher turns ratio b) use a higher frequency c) reverse it d) use low frequency 371. How could a balun change 100 ohms to 900 ohms a) use 3:1 turns ratio b) use 1:3 turns ratio c) use 9:1 turns ratio d) use 1:9 turns ratio 372. How high a frequency can transistor generate? a) above 10 GHz b) above 5 GHz c) above 2 GHz d) above 7.8 GHz 373. What is the microwave application of a varactor? a) mixer b) frequency multiplier c) demodulator d) demultiplexer 374. What diode does better than varactor in microwave frequencies? a) step recovery b) tunnel c) PIN d) Gunn
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375. The following diodes can generate microwave AC except: a) Tunnel b) LSA c) IMPATT d) Magnetron 376. For what are PIN diodes used in microwave? a) mixers b) modulators c) oscillators d) amplifier 377. What is the other name for LSA diodes? a) negative resistance b) bulk-effect c) tunneling effect d) time-space 378. What is the advantage of LSA over a Gunn Diode? a) more efficient b) higher power c) less noise d) higher frequency 379. What is wrong with the term Gunn Diode? a) not a gun b) not a semiconductor c) not a diode d) should be spelled with single “n” 380. What is important property do ferrites have which is used as a switch? a) faraday rotation b) resonance absorption c) magnetic properties d) high curie temperature 381. Which is used in circulators? a) resonance absorption b) magnetic properties c) ion resonance d) faraday rotation 382. What is the advantage of using a circulator with two transmitter and two receivers? a) many antennas b) less interference c) easy coupling d) one antenna only 383. To what must the fourth port be connected in a tunnel diode amplifier? a) resistor b) inductor c) capacitor d) impedance 384. To what must the third port be connected in a multiplexer circulator a) reflecting short circuit b) absorbing short circuit c) reflecting open circuit d) absorbing open circuit 385. What does radar mean? a) radio detection and range b) radio direction and radiation c) radio direction and range d) range direction radiation 386. In what distance unit are marine radars calibrated? a) statute miles b) kilometers c) nautical miles d) feet 387. What time unit is the equivalent of a radar mile? a) 12.3 microseconds b) 6.8 microseconds c) 4.5 microseconds d) 7.1 microseconds
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388. In what frequency band does marine radar operate?
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  • Spring '17
  • Jane Smooth
  • d., microwave

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