HIGHLIGHTED-Microwave-Communications.pdf

Because it is a capable of longer duty cycle b a more

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because it is a) capable of longer duty cycle b) a more efficient amplifier c) more broadband d) less noisy 347. A magnetic field is introduced into a waveguide by a a) probe b) dipole c) stripline d) capacitor 348. A reflex klystron is used as a/n a) amplifier b) oscillator c) mixer d) frequency multiplier
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349. Indicate the false statement: Manganese ferrite may be used as a a) circulator b) isolator c) garnet d) phase shifter 350. Indicate the false statement. Klystron amplifiers may use intermediate cavities to a) prevent oscillations that occur in two- cavity klystron b) increase the bandwidth of the device c) improve the power gain d) increase the efficiency of the klystron 351. What are limits of microwaves? a) 1 25,000 GHz b) 1 50,000 GHz c) 1 75,000 GHz d) 1 100,000 GHz 352. The following transmission lines are used for microwave frequencies, except: a) waveguide b) twin lead c) coax d) stripline 353. How much must a waveguide be? a) over a half-wave b) over a quarterwave c) over a wavelength d) over three-fourths of a wavelength 354. How high must a waveguide be? a) over a wavelength b) over a quarter wave c) over a half wave d) over two wavelengths 355. What is the designation of the lowest- frequency microwave band? a) V band b) X band c) Ku band d) L band 356. What is the designation of the highest- frequency microwave band? a) R band b) Ka band c) V band d) L band 357. What is reduced by using choke flanges? a) refraction b) reflection c) absorption d) cancellation 358. What is the name of the microwave transmission line that is used in printed circuits? a) microstrip b) coax c) twin lead d) twisted pair 359. Where is the resistive load placed in a directional coupler? a) front end of the primary b) front end of the secondary c) back end of the primary d) back end of the secondary 360. One of the following is a type of bolometer a) calorimeter b) thermocouple c) barreter d) carreter 361. Why are bolometers not used to detect modulation? a) thermal sluggishness b) inefficiency c) less accurate d) less precise
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362. The advantage of a resonant cavity over a hairpin tank? a) lesser Q b) wider bandwidth c) higher Q d) efficiency 363. What type of coupling is used between a waveguide and a waveguide wavemeter? a) loop antenna b) quarterwave antenna c) hole d) E probe 364. Which microwave tube has a repeller? a) TWT b) Klystron c) Magnetron d) BWO 365. Which microwave tube has a series of cavities? a) magnetron b) klystron c) TWT d) BWO 366. Which microwave tube has a helix a) klystron b) magnetron c) multicavity klystron d) BWO 367. Which microwave tube has a horseshoe magnet?
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