射频工程师测试题

射频工程师测试题内容摘要：

rfectly constant speed into/out of the antenna boresight b) Perfect concentric circle around antenna at constant altitude c) Speeds at integer multiples of antenna rotation rate 7. What does “MTI” stand for? a) Multiple Target Indication b) Mean Time Interval c) Moving Target Indication 8. Synthetic Aperture Radar (SAR) radar is mostly likely to be located on which platform? a) Police car b) Ship c) Airplane 9. Which feature of a “stealth” aircraft is most responsible for its low observability? a) Radar absorbent paint b) Multifaceted surfaces c) Minimal use of metals in airframe 10. What kind of radar did the webmaster of RF Cafe work on while in the ? a) MPN14 b) RDR12 c) NEXRAD RF Quiz 8: Hallmark Decades in Electronics 1. In which decade was the transistor invented? a) 1940s b) 1950s c) 1960s 2. In which decade was the telegraph invented? a) 1810s b) 1840s c) 1870s 3. In which decade was the Inter first implemented? a) 1950s b) 1960s c) 1970s 4. In which decade was the first solid state integrated circuit demonstrated? a) 1950s b) 1960s c) 1970s 5. In which decade were the first successful diode and triode vacuum tubes invented? a) 1880s b) 1890s c) 1900s 6. In which decade was the telephone invented? a) 1850s b) 1860s c) 1870s 7. In which decade was the AEEE (now the IEEE) founded? a) 1880s b) 1910s c) 1940s 8. In which decade with the first transatlantic radio broadcast occur? a) 1880s b) 1890s c) 1900s 9. In which decade was the SPICE simulator introduced? a) 1960s b) 1970s c) 1980s 10. In which decade was the ARRL founded? a) 1910s b) 1920s c) 1930s RF Quiz 9: A Smasbord of RF Topics 1. Where did Bluetooth™ get its name? a) Nobody really knows b) In honor of Harald Bl229。 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 plates in the body could be either parallel to or perpendicular to the PCB, affecting coupling b) Adhesion is usually better in one orientation c) Conductive epoxy adhesion is usually better in one orientation d) Orientation makes no difference 8. If you were handed an unprocessed wafer of gallium arsenide (GaAs), silicon (Si), silicongermanium (SiGe), and gallium nitride (GaN), how would you know which is GaN? a) GaN is transparent and the others are not b) The GaN wafer will be noticeably lighter in weight c) The GaN wafer will be much thinner than the others d) It would not be possible to tell the difference 9. The Smith Chart plot of a 50 ohm cable (in a 50 ohm system) spirals inward as the impedance is plotted through multiple cycles. What is that indicative of? a) A lossy cable b) A capacitive cable c) An inductive cable d) The cable is coiled on a spool 10. What are the three primary JEDEC models used for ESD testing? a) High (HHM), Medium (MHM), and Low (LHM) Humidity Model b) High (HVM), Medium (MVM), and Low (LVM) Voltage Model c) Human Body (HBM), Machine (MM), and Charged Device (CDM) Model d) Heidi Klum, Claudia Schiffer, and Gisele B252。 ndchen RF Quiz 10: A Sampling of RF Topics 1. What format would a nearfiled munications (13 MHz variety) antenna most likely take? a) Inductive coil b) Capacitive plate c) Yagi d) Parabolic dish 2. What does SOLT stand for? a) Short Overload Test b) Simple OperationaL Test c) Short, Open, Load, Through d) Strategic Offensive Limitation Talks 3. Which instrument would be best to use to locate a defective waveguide joint? a) Microscope b) Micrometer c) Spectrum Analyzer d) Time Domain Reflectometer 4. Which entity in the . determines whether an RF energyemitting device is allowed to be operated? a) The Federal Communications Commission b) The Amateur Radio Relay League c) The Honor System d) The Underwriter’s Laboratory 5. What does 2G, , 3G, etc., mean in reference to cellphones? a) The average cost of service, expressed in thousands of dollars ($ grand) per year b) The “generation” of the technology c) It is an arbitrary alphanumeric reference code d) The frequency band of operation, in GHz 6. Where would you be likely to find a free wireless Inter connection? a) Hotel Lobby b) Airport c) Your backyard d) All the above 7. Who hosts the MTTS International Microwave Symposium? a) Microwave Journal Magazine b) Microwaves amp。 RF Magazine c) RF Design Magazine d) The Institute of Electrical amp。 Electronics Engineers 8. What is the “rule of thumb” for estimating RF signal propagation distance vs. time in free space? a) 1 millimeter per millisecond b) 1 meter per microsecond c) 1 foot per nanosecond。