ELEMENT 2 - TECHNICIAN CLASS
Question Pool
SUBELEMENT T0 -- RF SAFETY [3 Exam
Questions -- 3 Groups] T0A RF safety fundamentals,
terms and definitions T0A01 (B)
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 (D)
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 (C)
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 (C)
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 (D)
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 (A)
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 (D)
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 (A)
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 (C)
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 (D)
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) T0B RF safety rules and guidelines
T0B01 (C)
Where will you find the applicable FCC RF radiation maximum permissible
exposure (MPE) limits defined? A. FCC Part 97 Amateur
Service Rules and Regulations
B. FCC Part 15 Radiation Exposure Rules and
Regulations C. FCC Part 1 and Office of Engineering and
Technology (OET) Bulletin 65 D. Environmental Protection Agency
Regulation 65 T0B02 (A)
What factors must you consider if your repeater station
antenna will be located at a site that is occupied by antennas for transmitters
in other services? A. Your radiated
signal must be considered as part of the total RF radiation from the site when
determining RF radiation exposure levels B. Each individual transmitting
station at a multiple transmitter site must meet the RF radiation exposure
levels
C. Each station at a multiple-transmitter site may add no more than
1% of the maximum permissible exposure (MPE) for that site
D. Amateur
stations are categorically excluded from RF radiation exposure evaluation at
multiple-transmitter sites T0B03
(D)
To determine compliance with the maximum
permitted exposure (MPE) levels, safe exposure levels for RF energy are averaged
for an “uncontrolled” RF environment over what time period? A. 6 minutes
B. 10 minutes
C. 15 minutes D.
30 minutes T0B04 (A)
To determine compliance with the maximum permitted
exposure (MPE) levels, safe exposure levels for RF energy are averaged for a
“controlled” RF environment over what time period? A. 6 minutes B. 10 minutes
C. 15 minutes
D. 30
minutes T0B05 (B)
Which of the following categories describes most common
amateur use of a hand-held transceiver? A. Mobile devices
B. Portable devices C. Fixed devices
D. None of
these choices is correct T0B06
(A)
How does an Amateur Radio operator demonstrate
that he or she has read and understood the FCC rules about RF-radiation
exposure? A. By indicating his or her
understanding of this requirement on an amateur license application form at the
time of application B. By posting a copy of Part 97 at the station
C.
By completing an FCC Environmental Assessment Form
D. By completing an FCC
Environmental Impact Statement T0B07 (D)
What amateur stations must comply
with the requirements for RF radiation exposure spelled out in Part 97?
A. Stations with antennas that exceed 10 dBi of gain.
B. Stations that have a duty cycle greater than 50 percent.
C. Stations
that run more than 50 watts peak envelope power(PEP) D. All
amateur stations regardless of power T0B08 (C)
Who is
responsible for ensuring that an amateur station complies with FCC Rules about
RF radiation exposure? A. The Federal Communications
Commission
B. The Environmental Protection Agency C. The
licensee of the amateur station D. The Food and Drug Administration
T0B09 (C)
Why do exposure limits vary with frequency? A.
Lower-frequency RF fields have more energy than higher-frequency fields
B.
Lower-frequency RF fields penetrate deeper into the body than higher-frequency
fields C. The body’s ability to absorb RF energy varies with
frequency D. It is impossible to measure specific absorption rates at
some frequencies T0B10 (A)
Why is the concept of "duty cycle" one factor used to
determine safe RF radiation exposure levels? A. It takes into account the amount of time the transmitter is
operating at full power during a single transmission B. It takes into
account the transmitter power supply rating
C. It takes into account the
antenna feed line loss
D. It takes into account the thermal effects of the
final amplifier T0B11 (D)
From an RF safety standpoint, what impact does the duty
cycle have on the minimum safe distance separating an antenna and the
neighboring environment? A. The lower the duty cycle, the
shorter the compliance distance
B. The compliance distance is increased with
an increase in the duty cycle
C. Lower duty cycles subject the environment
to lower radio-frequency radiation cycles D. All of these
answers are correct T0C Routine station
evaluation (Practical applications for VHF/UHF and above operations)
T0C01 (A)
If
you do not have the equipment to measure the RF power densities present at your
station, what might you do to ensure compliance with the FCC RF radiation
exposure limits? A. Use one or more of
the methods included in the amateur supplement to FCC OET Bulletin 65 B.
Call an FCC-Certified Test Technician to perform the measurements for you
C.
Reduce power from 200 watts PEP to 100 watts PEP
D. Operate only
low-duty-cycle modes such as FM T0C02 (D)
Is it necessary for you to perform
mathematical calculations of the RF radiation exposure if your station transmits
with more than 50 watts peak envelope power (PEP)? A. Yes,
calculations are always required to ensure greatest accuracy
B. Calculations
are required if your station is located in a densely populated neighborhood
C. No, calculations may not give accurate results, so measurements are
always required D. No, there are alternate means to
determine if your station meets the RF radiation exposure limits
T0C03 (B)
Why should you make sure the antenna of a hand-held
transceiver is not too close to your head when transmitting? A. To help the antenna radiate energy equally in all directions B. To reduce your exposure to the radio-frequency energy C.
To use your body to reflect the signal in one direction
D. To keep
electrostatic charges from harming the operator T0C04 (A)
What should you
do for safety if you put up a UHF transmitting antenna? A. Make sure the antenna will be in a place where no
one can get near it when you are transmitting B. Make sure that RF field
screens are in place
C. Make sure the antenna is near the ground to keep its
RF energy pointing in the correct direction
D. Make sure you connect an RF
leakage filter at the antenna feed point T0C05 (A)
How should you position the antenna
of a hand-held transceiver while you are transmitting? A. Away from your head and away from others
B. Towards the station you are contacting
C. Away from the station
you are contacting
D. Down to bounce the signal off the ground
T0C06 (B)
Why should your antennas be located so that no one can touch them while you
are transmitting? A. Touching the antenna might cause
television interference B. Touching the antenna might cause
RF burns C. Touching the antenna might cause it to radiate harmonics
D. Touching the antenna might cause it to go into self-oscillation
T0C07 (B)
For the lowest RF radiation exposure to passengers, where would you mount
your mobile antenna? A. On the trunk lid B. On the roof C. On a front fender opposite the broadcast
radio antenna
D. On one side of the rear bumper T0C08 (C)
What should you
do for safety before removing the shielding on a UHF power amplifier?
A. Make sure all RF screens are in place at the antenna
feed line
B. Make sure the antenna feed line is properly grounded C. Make sure the amplifier cannot accidentally be turned on
D. Make sure that RF leakage filters are connected T0C09 (C)
Why might mobile
transceivers produce less RF radiation exposure than hand-held transceivers in
mobile operations? A. They do not produce less exposure
because they usually have higher power levels.
B. They have a higher duty
cycle C. When mounted on a metal vehicle roof, mobile
antennas are generally well shielded from vehicle occupants D. Larger
transmitters dissipate heat and energy more readily T0C10 (B)
What are some
reasons you should never operate a power amplifier unless its covers are in
place? A. To maintain the required high operating
temperatures of the equipment and reduce RF radiation exposure B. To reduce the risk of shock from high voltages and reduce RF
radiation exposure C. To ensure that the amplifier will go into self
oscillation and to minimize the effects of stray capacitance
D. To minimize
the effects of stray inductance and to reduce the risk of shock from high
voltages
END OF SUB-ELEMENT T0