E0A01
What, if any, are the differences between the radiation produced by radioactive materials and the electromagnetic energy radiated by an antenna?
A. There is no significant difference between the two types of radiation
B. Only radiation produced by radioactivity can injure human beings
C. RF radiation does not have sufficient energy to break apart atoms and molecules; radiation from radioactive sources does
D. Radiation from an antenna will damage unexposed photographic film, ordinary radioactive materials do not cause this problem
E0A02
When evaluating exposure levels from your station at a neighbor’s home, what must you do?
A. Make sure signals from your station are less than the controlled MPE limits
B. Make sure signals from your station are less than the uncontrolled MPE limits
C. Nothing; you need only evaluate exposure levels on your own property
D. Advise your neighbors of the results of your tests
E0A03
Which of the following would be a practical way to estimate whether the RF fields produced by an amateur radio station are within permissible MPE limits?
A. Use a calibrated antenna analyzer
B. Use a hand calculator plus Smith-chart equations to calculate the fields
C. Walk around under the antennas with a neon-lamp probe to find the strongest fields
D. Use a computer-based antenna modeling program to calculate field strength at accessible locations
E0A04
When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?
A. Only the most powerful transmitter
B. Only commercial transmitters
C. Each transmitter that produces 5% or more of its maximum permissible exposure limit at accessible locations
D. Each transmitter operating with a duty-cycle greater than 50%
E0A05
What is one of the potential hazards of using microwaves in the amateur radio bands?
A. Microwaves are ionizing radiation
B. The high gain antennas commonly used can result in high exposure levels
C. Microwaves often travel long distances by ionospheric reflection
D. The extremely high frequency energy can damage the joints of antenna structures
E0A06
Why are there separate electric (E) and magnetic (H) field MPE limits?
A. The body reacts to electromagnetic radiation from both the E and H fields
B. Ground reflections and scattering make the field impedance vary with location
C. E field and H field radiation intensity peaks can occur at different locations
D. All of these answers are correct
E0A07
What is the "far-field" zone of an antenna?
A. The area of the ionosphere where radiated power is not refracted
B. The area where radiated power dissipates over a specified time period
C. The area where radiated field strengths are obstructed by objects of reflection
D. The area where the shape of the antenna pattern is independent of distance
E0A08
What does SAR measure?
A. Synthetic Aperture Ratio of the human body
B. Signal Amplification Rating
C. The rate at which RF energy is absorbed by the body
D. The rate of RF energy reflected from stationary terrain
E0A09
Which insulating material commonly used as a thermal conductor for some types of electronic devices is extremely toxic if broken or crushed and the particles are accidentally inhaled?
A. Mica
B. Zinc oxide
C. Beryllium Oxide
D. Uranium Hexaflouride
E0A10
What material found in some electronic components such as high-voltage capacitors and transformers is considered toxic?
A. Polychlorinated biphenyls
B. Polyethylene
C. Polytetrafluroethylene
D. Polymorphic silicon
E0A11
Which of these items might be a significant hazard when operating a klystron or cavity magnetron transmitter?
A. Hearing loss caused by high voltage corona discharge
B. Blood clotting from the intense magnetic field
C. Injury from radiation leaks that exceed the MPE limits
D. Ingestion of ozone gas from the cooling system