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Subelement Q
SAFETY
Section 99
Radiation Exposure
Compliance with MPE, or Maximum Permissible Exposure to RF levels (as defined in FCC Part 1, OET Bulletin 65) for “controlled” environments, are averaged over _______ minutes, while “uncontrolled” RF environments are averaged over ______ minutes.
  • Correct Answer
    6, 30.
  • 30, 6.
  • 1, 15.
  • 15, 1.
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Sites having multiple transmitting antennas must include antennas with more than _______% of the maximum permissible power density exposure limit when evaluating RF site exposure.
  • Any
  • Correct Answer
    5
  • 1
  • 12.5
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RF exposure from portable radio transceivers may be harmful to the eyes because:
  • Magnetic fields blur vision.
  • RF heating polarizes the eye lens.
  • The magnetic field may attract metal particles to the eye.
  • Correct Answer
    RF heating may cause cataracts.
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At what aggregate power level is an MPE (Maximum Permissible Exposure) study required?
  • Correct Answer
    1000 Watts ERP.
  • 500 Watts ERP.
  • 100 Watts ERP.
  • Not required.

Memory aid: At a kilowatt, will it kilo-you?

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Why must you never look directly into a fiber optic cable?
  • High power light waves can burn the skin surrounding the eye.
  • Correct Answer
    An active fiber signal may burn the retina and infra-red light cannot be seen.
  • The end is easy to break.
  • The signal is red and you can see it.
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If the MPE (Maximum Permissible Exposure) power is present, how often must the personnel accessing the affected area be trained and certified?
  • Weekly.
  • Monthly.
  • Correct Answer
    Yearly.
  • Not at all.
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