ATI2 Exam Study Guide

ATI2 Exam Study Guide What is the heart of any computer system? - Operating system UNIX is a trademark of what company? - AT&T What allows the programmer to write a single instruction that is equivalent to a specified sequence of machine instructions? - Macroinstructions What is the greatest threat to the soundness of metals and to the structural integrity of an aircraft? - Metal corrosion What is the primary consideration of a manufacturer during the design and production of an aircraft? - Aerodynamic efficiency What is defined as anything that occupies space and has weight? - Matter Which substance cannot be reduced to a simpler substance by chemical means? - Element What is the resulting substance called when 2 or more elements are chemically combined? - Compound What is a combination of elements and compounds that are not chemically combined that can be separated by physical means called? - Mixture What is the smallest particle of an element that retains the characteristics of that element called? - Atom The atoms of each element are made up electrons, protons and in most cases neutrons, which are collectively called what? - Subatomic particles How many times more mass do protons have than electrons? - 1837 What state is the atom said to be in once it has been elevated to an energy level that is higher than the lowest possible energy level? - Excited What are the groups of orbits called that electrons reside? - Shells Which property of the atom is determined by the number of electrons in the outermost shell? - Valence What state is the atom said to be in when it loses electrons or gains electrons? - Ionization What is the maximum number of valence electrons that conductors have? - 3 What is the minimum number of valence electrons that insulators have? - 5 How many valence electrons do semiconductors usually have? - 4 What is the best conductor of electricity? - Silver What is the opposition that a material offers to the magnetic lines of force called? - Reluctance What is the opposition that a magnetism which remains in a temporary magnet referred to as? - Residual magnetism