the lowest layer of clouds described as either _ make up the cloud ceiling, which is the height above ground level a. fog or rain b. broken or overcast c. cumulus or stratus {Ans: b. broken or overcast}high frequency carrier waves are able to carry more information, because there are more waves, and the waves are _ a. closer to each other b. longer c. taller {Ans: a. closer to each other}prior to any flight, a pilot will do a self-assessment using the IMSAFE memory aid. What does the letter A mean? a. alcohol b. altitude c. attitude d. approval {Ans: a. alcohol}the method used to track reliability of unmanned aircraft components is known as a. mean time between failure (MTBF) b. crew resource management c. manufacturer updates d. fault tolerance {Ans: a. mean time between failure (MTBF)}According to the FAA, an accident is defined as a. flying over spectators b. flying in a national park c. not following the flight plan d. serious injury requiring hospitalization {Ans: d. serious injury requiring hospitalization}the Federal Aviation Administration certificate, __, establishes operating limits for commercial UAS a. FAA Part 135 b. FAA Part 91 c. FAA Part