NCTI Installer Technician Exam Questions And Answers

20 milliamperes is the same as ________. (Remember, 1 milliampere = 0.001 ampere.) - Answer 0.02 amperes The orbital shell that has a maximum electron capacity of 18 electrons is the ___________ shell. - Answer Third A semiconductor material - Answer Has four valence electrons. The major factor for determining whether a particular element is a conductor, a semiconductor, or an insulator is - Answer The number of electrons in the valence shell. Elements that are called conductors - Answer Have very few valence electrons. The term voltage normally refers to - Answer The measurement of the difference in potential between two charges. The ampere - Answer Indicates how many coulombs pass a given point during 1 second. Electric current is actually produced by - Answer The transfer of energy from valence electron to valence electron as a result of applied charges. What prevents the electrons that orbit an atom's nucleus at high speeds from breaking away from the nucleus due to centrifugal force? - Answer The attraction between the positive nucleus and the negative electron. 5 kilovolts is the same as - Answer 5 kV. To create an electromagnet, - Answer Wrap a coil of insulated wire around an iron bar and pass an electric current through the wire. Magnetism - Answer Was discovered when the Greeks noticed that magnetite always aligned itself in a north and south direction. In a magnetic material, - Answer Where only some of the magnetic domains are pointing in the same direction, the magnetic field is weaker.The strength of an electromagnetic field is - Answer Determined by the magnitude of the magnetomotive force (mmf). The magnetic field - Answer Created by a straight piece of wire is weaker than that created by forming loops of wire.