NEETS 18.txt

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bc901
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286906
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NEETS 18.txt
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2014-10-24 01:29:49
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  1. Electromagnetic energy travels through air at approximately the speed of light, which is __________ STATUTE MILES per second.
  2. 186,000
  3. 186,000 statute miles is approximately _______ nautical miles
  4. 162,000
  5. While the distance of the statute mile is approximately 5,280 feet, the distance for a nautical mile is approximately _________ feet.
  6. 6,080
  7. Radiated energy from a radar set travels at approximately ____ feet per microsecond
    984
  8. Time for energy to travel one nautical mile is _____ microseconds.
    6.18
  9. Because two-way travel is involved, a total time of _____ microseconds per nautical mile will elapse between the start of the pulse from the antenna and its return to the antenna from a target.
    12.36
  10. ________ microsecond time interval is sometimes referred to as a RADAR MILE, RADAR NAUTICAL MILE, or NAUTICAL RADAR MILE.
    12.36
  11. _______ scanning is used in fire-control tracking radars
  12. monopulse
  13. With _________ (SIMULTANEOUS) LOBING, all range, bearing, and elevation-angle information of a target is obtained from a single pulse
    monopulse
  14. When radio-frequency energy transmitted from a fixed point continuously strikes an object that is either moving toward or away from the source of the energy, the frequency of the reflected energy is changed. This shift in frequency is known as the ______________.
    DOPPLER EFFECT
  15. ________RADAR, is designed to continuously scan a volume of space to provide initial detection of all targets.
  16. Search
  17. _______ radar provides continuous range, bearing, and elevation data on one or more targets.
  18. Track
  19. Klystrons, magnetrons, rectifiers, or other tubes that employ an excitation of _______ volts or
  20. more may emit X rays out to a few feet; thus, unshielded personnel standing or working close to the tubes will be endangered.
  21. 15,000

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