【正文】 d) Boltzmann39。5% c) 62 kΩ, 177。 Maxwell bend b) 90176。 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 d) 1 inch per picosecond 9. What is the “rule of thumb” for estimating RF frequency vs. wavelength in free space? a) 300 MHz = 1 meter b) 100 MHz = 1 meter c) 300 MHz = 3 feet (1 yard) d) 100 MHz = 1 foot 10. What is the most unique feature of a Helmholtz coil? a) The high voltage makes for cool Jacob’s Ladders b) Magic field lines are extremely uniform within the coil c) It is selfpowered d) It uses a rare earth element core 1. Which hand rule applies for determining the direction of the magic field around a currentcarrying wire? Assume conventional current flow from positive to negative, and magic field leaving the north pole and entering the south pole. a) Righthand rule b) Lefthand rule c) Wholehand rule 2. What is the name given to the display pattern when independent signals are fed into the xaxis and yaxis ports of an oscilloscope? a) XY waveform b) Lissajous waveform c) Complex 3. How is the word Fresnel pronounced (as in Fresnel zone or Fresnel grating)? a) frēsn?l39。Reilly c) Albert Einstein 6. Which flying (movement) condition will always result in a Doppler speed of 0 m/s? a) Perfectly 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。 Hard Rubber 7. Along which side of rectangular waveguide is an E bend made? a) Longer side b) Shorter side c) Either side 8. What is the lowest modulation index at which an FM carrier is suppressed? a) b) ? () c) Only AM carriers can be suppressed 9. How much current is required through the human body to cause an onset to muscular paralysis during electrocution? a) Voltage is the culprit during electrocution, not current b) 21 mA c) 189。F) 3. What is the frequency band for the 900 MHz GSM cellular band? a) Tx: 880915 MHz / Rx: 925960 MHz b) Tx: 824849 MHz / Rx: 869894 MHz c) There is no 900 MHz GSM band 4. What does GSM stand for? a) General System for Mobile phones b) Greater Spectrum for Mobile phones c) Global System for Mobile Communication 5. What does POTS stand for (in munications)? a) Plain Old Telephone System b) PersOnal Telephony System c) Personal Orbital amp。F) b) 250176。 RF Quiz 1 1. What is the impedance of free space? 377ou 2. What happens to the noise figure of a receiver when a 10 dB attenuator is added at the input? a) Noise figure increases by 10 dB b) Noise figure decreases by 10 dB c) Noise figure doesn39。C (212176。C (386176。 Celluloid c) Glass amp。s 2. Which best describes a bistatic radar? a) Fixed transmitter and fixed receiver at different locations b) Uses static electricity for both transmitted and received signals c) Only detects fixed (nonmoving) targets 3. What is a radar crosssection (RCS)? a) An engineering isometric drawing showing a slice through the equipment rack(s)? b) A target’s reflection coefficient relative to a perfectly reflecting spherical surface of 1 m^2 crosssection c) The plane through which a radar signal passes through a target 4. What are mon units of radar crosssection (RCS)? a) dBsm b) dBrcs c) dBm 5. Who is known as ”The Father of Radar?” a) Robert WatsonWatt b) Walter Eugene O39。 RF Magazine c) RF Design Magazine d) The Institute of Electrical amp。 4. What type of filter is shown to the right? a) Lowpass b) Highpass c) Bandpass 5. What is the order of the filter shown to the right? a) 2 b) 4 c) 6 6. What type of transmission line is shown to the right? a) Coaxial b) Stripline c) Microstrip 7. What type of waveguide bend is shown to the right? a) 90176。5% b) 62 kΩ, 177。 assigned? a) speed of light in a vacuum b) dielectric constant of a vacuum c) acceleration of gravity near Earth39。s Current Law b) Chebysh