HIGHLIGHTED-Microwave-Communications.pdf

A 95 ghz s band b 3 ghz x band c 95 ghz ku band d 3

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a) 9.5 GHz S band b) 3 GHz X band c) 9.5 GHz Ku band d) 3 GHz S band 389. To what two circuits would a radar timer circuit feed signals? a) modulator and mixer b) amplifier and circulator c) modulator and circulator d) amplifier and modulator 390. What is the target display on a CRT called? a) crosshair b) blip c) center spot d) round 391. What is the main bang on a PPI radar set? a) blip b) center spot c) bearing d) round 392. What is the ability to separate adjacent equidistant targets called? a) bearing resolution b) narrow bandwidth c) high frequency d) shorter wavelength 393. What is the approximate rotational rate of a radar antenna? a) 20 rpm b) 5 rpm c) 25 rpm d) 10 rpm 394. How is radar CRTs differ from TV? a) square b) round c) rectangular d) trapezoidal 395. What circuits make up the radar transmitter? a) multivibrator b) trapezoidal oscillator c) sine wave generator d) blocking oscillator 396. What type of oscillator determines the PRR? a) blocking b) pulse c) square d) blocking or pulse 397. What other circuit might be used as an oscillator that determines the PRR? a) trapezoidal generator b) unbalanced multivibrator c) bistable multivibrator d) sinewave generator 398. Why are hydrogen-gas thyratrons used in radar? a) fast-ionize b) cheaper c) accurate d) efficient 399. What is the other name for a pulse-forming network in radars? a) tuned circuit b) oscillators c) delay line d) capacitive circuits 400. What determines the PRR in odd-time radar sets? a) tuned circuit frequency b) oscillator frequency c) spark gap speed d) MOPA transmitter time
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401. What is used to carry RF energy from magnetron to antenna in a radar set? a) helix b) parallel wireline c) coax d) waveguide 402. What is the method of illuminating a parabolic reflector with RF? a) horn b) cassegrain c) helix d) coax 403. How would a radar reflector be parabolic- shaped a) circularly b) vertically c) horizontally d) none of these 404. In what way are radar emissions similar to microwave ovens? a) can transmit b) can receive c) can cook d) can transceiver 405. To what tube is a dc keep-alive voltage applied? a) Oscillator b) Transmit-Receive Mixer c) Circulator d) Isolator 406. In radar, if the mixer diode burns out, what are replaced? a) tube b) mixer c) antenna d) diode 407. What is the cavity between magnetron and mixer cavity called? a) ATR b) TR c) Transmit d) Receive 408. Radar receivers use what Ifs a) 20 MHz and lower b) 10 MHz and higher c) 30 MHz or higher d) 10 MHz and lower 409. What kind of local oscillators does a radar receiver use?
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