【正文】 d) tolerance of the standard meter 5. To which constant is *1028 g assigned? a) neutron rest mass b) proton acceleration c) electron rest mass d) photon acceleration 6. To which constant is m/s178。s Current Law 2. How much power is dissipated by an ideal 100 pF capacitor fed by a 1 Vpkpk sinewave at 10 MHz? Hint: Z = 1/(2πfC) a) mW b) mW c) mW d) 0 mW 3. What causes a ground current loop? a) A coil of wire b) A open ground point c) More than one ground potential in a circuit d) A single ground potential in a circuit 4. What type of filter does this circuit represent? a) Highpass b) Lowpass c) Bandpass d) Bandstop 5. How many poles does the filter in Q4 have? a) 4 b) 2 c) 1 d) 0 6. What is the configuration of the opamp shown here? a) Integrator b) Differentiator c) Divider d) Multiplier 7. What is the secondary voltage of this transformer? a) 20 V b) 10 V c) 5 V d) 2 V 8. What is the impedance of the transformer secondary in Q7? a) 100 ? b) 20 ? c) 10 ? d) 4 ? 9. In an ideal system, what is the minimum sampling rate to prevent aliasing of a signal with a maximum frequency of 100 kHz? a) 1 MHz b) 200 kHz c) 100 kHz d) 10 kHz 10. Which type of diode typically has the lowest forward bias voltage for a given。s surface d) magic constant 7. To which constant is *1012 F/m assigned? a) rate of change of temperature in silicon b) speed of light in a vacuum c) permittivity of free space d) permeability of free space 8. To which constant is *108 km/s assigned to? a) orbital velocity b) electron speed c) acceleration of gravity d) speed of light in a vacuum 9. To which constant is *1023 J/K assigned? a) universal gas constant b) carbon band energy c) uranium band energy d) Boltzmann39。 Maxwell bend b) 90176。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。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。 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 (386176。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。 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。 assigned? a) speed of light in a vacuum b) dielectric constant of a vacuum c) acceleration of gravity near Ear