【正文】 10. Complete the following adage used in the days before puter simulators. If you want an oscillator, design an amplifier. If you want an amplifier, design a(n) ____. a) Amplifier b) Filter c) Oscillator d) Radio RF Quiz15 1. To which constant is *1023/ mol assigned? a) universal constant b) Avogadro39。s Current Law d) Lenz39。s constant 10. To which constant is *106 H/m assigned? a) Bohr radius b) speed of light in a vacuum c) permittivity of free space d) permeability of free space RF Quiz16 1. What does dBi, the most often used unit for antenna gain (or directivity), stand for? a) Decibels of isolation b) Isometric radiation in decibels c) Decibels of gain relative to an isotropic radiator d) Intrinsic gain in decibels 2. For which region of space does antenna gain normally apply? a) Near field b) Far field c) At the feed point d) Everywhere Elevation Pattern Azimuth Pattern which type of antenna does the pattern to the right describe? a) Parabolic b) Yagi c) 1/2wave dipole d) 1/4wave vertical whip 4. What is the free space impedance that an antenna sees? a) 50 Ω b) 75 Ω c) 16p Ω (≈50 Ω) d) 120p Ω (≈377 Ω) 5. What is the name given to the point where the RF input signal interfaces to the antenna? a) ICP (input connection point) b) Feedpoint c) BNC connector d) N connector 6. Where is the approximate transition point between near field and far field? a) λ / (2p) b) λ c) 5λ d) 10λ 7. What is an isotropic radiator? a) An antenna that radiates equally in all directions b) An antenna with equal dimensions c) An antenna designed to broadcast in the troposphere d) None of the above 8. Which type of antenna would typically have the highest directivity? a) 1/4wave whip b) Folded dipole c) Yagi d) Parabolic 9. On a centerfed 1/2wave dipole, where is the voltage potential the highest? a) In the center b) At the tips c) Equal everywhere d) Nowhere dipoles operate on current 10. Yagi antennas are constructed of which three types of elements? a) Transmitter, receiver, and transceiver b) Underdriven, driven, and overdriven c) Reflector, driven, and director d) Aluminum, iron, and magnesium RF Quiz17 1. Who is credited with inventing the puter mouse? a) Bill Gates b) Steve Jobs c) Bill Nye (the science guy) d) Douglas Engelbart 2. Who is credited with discovering the transistor? a) John Bardeen b) William Shockley c) Walter Brattain d) All the above 3. Who invented the Viterbi programming algorithm? a) Andrew Viterbi b) Robert Pease c) Albert Einstein d) Robert Lucky 4. Who is credited with inventing the triode amplifier vacuum tube (Audion)? a) Sir Jonathan Audion b) James Watt c) Brian Koenigsmark d) Lee De Forest 5. Who invented the tunnel diode? a) Scott Adams b) Leo Esaki c) Patrick Fitzgerald d) Igor Stravinsky 6. Who is credited with inventing spread spectrum munications? a) Akio Morita b) Thomas Steenland c) Hedy Lamarr d) Albert Gore 7. Who is credited with inventing frequency modulation (FM)? a) Edwin Armstrong b) Heike Onnes c) Robert Jarvik d) Charlie Eppes 8. Who is credited with inventing television? a) Yataro Iwasaki b) Lothar Rohde c) Hermann Schwarz d) Philo Farnsworth 9. Who is credited with inventing radar? a) Gordon Gould b) Elmer Sperry c) Sir Robert WatsonWatt d) Augustus Raytheon 10. Who is credited with inventing the first integrated circuit? a) Garrett Man b) Jack Kilby c) James (Jim) Wilson d) Grace Hopper RF Quiz18 . Gutta percha a) 16th century Indian physicist b) Latin for cat gut, used for stringed instruments c) Cable insulation d) Explosive pound 2. Condenser a) Capacitor b) Air pump c) Mass pactor d) Electrical probe 3. Luminiferous aether a) Flame created by laboratory heaters b) Medium that supports the transmission of light particles c) The light of the moon d) Glowing gas 4. Thermionic valve a) Vacuum tube diode b) Heat flow switch c) Systolic pump d) Lock 5. Dephlogisticated air a) Dry (dehumidified) air b) Perfect vacuum c) Supersaturated air d) Molecular oxygen 6. Corpuscle a) Lowranking enlisted man39。 HPlane bend c) 90176。tand, once king of Denmark c) In honor of its developer, “Big Blue” (IBM) d) From a Muppets characters by the same name 2. Where did ZigBee get its name? a) Nobody really knows b) From the zigzag path of a bee c) Named after the ic strip character, Ziggy d) From the German phrase “sie gabe,“ meaning, “it just works” 3. Who is credited with conceiving of spread spectrum radio munications? a) Dr. Andrew Viterbi b) Qualm c) Actress Hedy Lamarr d) Kinch, the radio operator of Hogan’s Heroes 4. What is meant by the fronttoback ratio of a Yagi antenna? a) The physical size of the front half of the antenna vs. the back half b) The number of driven elements vs. number of director elements c) Power radiated in the front main lobe vs. power in opposite direction d) The weight proportion of the front half of the antenna vs. the back half 5. In an FM modulator with a 10 kHz deviation and a 5 kHz maximum modulating frequency, what is the total occupied bandwidth? a) 10 kHz b) 15 kHz c) 20 kHz d) 30 kHz 6. Which WLAN standard provides the highest data rate? a) ( GHz RF)54Mbps b) ( GHz RF)11Mbps c) ( GHz RF)54Mbps d) ( GHz RF)100Mbps+ 7. Why might the mounting orientation of a surface mount capacitor affect frequency response? a) The plat