Ham Radio - Extra Class - Question Pool with correct answers

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 CORRECT ANSWER (C) 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 CORRECT ANSWER (B) 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 CORRECT ANSWER (D) 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