T0A RF safety fundamentals, terms and
definitions
T0A01
@T0A01
Why is
it a good idea to adhere to the FCC's Rules for using the
minimum
power needed when you are transmitting with your hand-held
radio?
A. Large fines are always imposed on operators
violating this rule
B. To reduce the level of RF radiation exposure
to the operator's
head
C. To reduce calcification of the NiCd battery
pack
D. To eliminate self oscillation in the
receiver RF amplifier
T0A02
@T0A02
Over
what frequency range are the FCC Regulations most stringent for
RF
radiation exposure?
A. Frequencies below 300 kHz
B. Frequencies between 300 kHz and 3 MHz
C. Frequencies between 3 MHz and 30 MHz
D. Frequencies between 30 MHz and 300 MHz
T0A03
@T0A03
What is
one biological effect to the eye that can result from RF
exposure?
A. The strong magnetic fields can cause blurred
vision
B. The strong magnetic fields can cause
polarization lens
C. It can cause heating, which can result in
the formation of
cataracts
D. It can cause heating, which can result in
astigmatism
T0A04
@T0A05
In the
far field, as the distance from the source increases, how does
power
density vary?
A. The power density is proportional to the
square of the distance
B. The power density is proportional to the
square root of the
distance
C. The power density is proportional to the
inverse square of the
distance
D. The power density is proportional to the
inverse cube of the
distance
T0A05
@T0A06
In the
near field, how does the field strength vary with distance from
the
source?
A. It always increases with the cube of the
distance
B. It always decreases with the cube of the
distance
C. It varies as a sine wave with distance
D. It depends on the type of antenna being used
T0A06
@T0A09
Why
should you never look into the open end of a microwave feed horn
antenna
while the transmitter is operating?
A. You may be exposing your eyes to more than
the maximum permissible
exposure
of RF radiation
B. You may be exposing your eyes to more than
the maximum permissible
exposure
level of infrared radiation
C. You may be exposing your eyes to more than
the maximum permissible
exposure
level of ultraviolet radiation
D. All of these choices
are correct
T0A07
@T0A10
Why are
Amateur Radio operators required to meet the FCC RF radiation
exposure
limits?
A. The standards are applied equally to all
radio services
B. To ensure that RF radiation occurs only in a
desired direction
C. Because amateur station operations are more
easily adjusted than
those
of commercial radio services
D. To ensure a safe operating environment for
amateurs, their
families
and neighbors
T0A08
@T0A11
Why are
the maximum permissible exposure (MPE) levels not uniform
throughout
the radio spectrum?
A. The human body absorbs energy differently at
various frequencies
B. Some frequency ranges have a cooling effect
while others have a
heating
effect on the body
C. Some frequency ranges have no effect on the
body
D. Radiation at some frequencies can have a
catalytic effect on the
body
T0A09
@T0B01
What does
the term "specific absorption rate" or SAR mean?
A. The degree of RF energy consumed by the
ionosphere
B. The rate at which transmitter energy is lost
because of a poor
feed
line
C. The rate at which RF energy is absorbed into
the human body
D. The amount of signal weakening caused by
atmospheric phenomena
T0A10
@T0B04
On what
value are the maximum permissible exposure (MPE) limits based?
A. The square of the mass of the exposed body
B. The square root of the mass of the exposed
body
C. The whole-body specific gravity (WBSG)
D. The whole-body specific absorption rate
(SAR)