Key Topic 99: Radiation Exposure

Question 1

3-99Q1: 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.

A. 6, 30.
B. 30, 6.
C. 1, 15.
D. 15, 1.

Answer 1

A. 6, 30.

Question 2

3-99Q2: Sites having multiple transmitting antennas must include antennas with more than ____% of the maximum permissible power density exposure limit when evaluating RF site exposure.

A. Any
B. 5
C. 1
D. 12.5

Answer 2

B. 5

Question 3

3-99Q3: RF exposure from portable radio transceivers may be harmful to the eyes because:

A. Magnetic fields blur vision.
B. RF heating polarizes the eye lens.
C. The magnetic field may attract metal particles to the eye.
D. RF heating may cause cataracts.

Answer 3

D. RF heating may cause cataracts.

Question 4

3-99Q4: At what aggregate power level is an MPE (Maximum Permissible Exposure) study required?

A. 1000 Watts ERP.
B. 500 Watts ERP.
C. 100 Watts ERP.
D. Not required.

Answer 4

A. 1000 Watts ERP.

Question 5

3-99Q5: Why must you never look directly into a fiber optic cable?

A. High power light waves can burn the skin surrounding the eye.
B. An active fiber signal may burn the retina and infra-red light cannot be seen.
C. The end is easy to break.
D. The signal is red and you can see it.

Answer 5

B. An active fiber signal may burn the retina and infra-red light cannot be seen.

Question 6

3-99Q6: If the MPE (Maximum Permissible Exposure) power is present, how often must the personnel accessing the affected area be trained and certified?

A. Weekly.
B. Monthly.
C. Yearly.
D. Not at all.

Answer 6

C. Yearly.