NCTI Installer Technician | Practice Questions and Answers Graded A+
NCTI Installer Technician | Practice Questions and Answers Graded A+
NCTI Installer Technician | Practice Questions and Answers Graded A+
NCTI Installer Technician | Practice
Questions and Answers Graded A+
The major factor for determining whether a particular element is a
conductor, a semiconductor, or an insulator is - Correct Answer -
The number of electrons in the valence shell.
Elements that are called conductors - Correct Answer - Have
very few valence electrons.
The term voltage normally refers to - Correct Answer - The
measurement of the difference in potential between two charges.
The ampere - Correct Answer - Indicates how many coulombs
pass a given point during 1 second.
Electric current is actually produced by - Correct 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? - Correct Answer - The attraction between the positive
nucleus and the negative electron.
,5 kilovolts is the same as - Correct Answer - 5 kV.
To create an electromagnet, - Correct Answer - Wrap a coil of
insulated wire around an iron bar and pass an electric current
through the wire.
Magnetism - Correct Answer - Was discovered when the
Greeks noticed that magnetite always aligned itself in a north and
south direction.
In a magnetic material, - Correct 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 - Correct Answer -
Determined by the magnitude of the magnetomotive force (mmf).
The magnetic field - Correct Answer - Created by a straight
piece of wire is weaker than that created by forming loops of wire.
Flux lines - Correct Answer - Always curve around through the
body of the magnet to form complete loops.
,Magnetic poles that are ___________ will ____________ each
other when those poles are near each other. - Correct Answer -
Alike, repel
A permanent-magnet loudspeaker - Correct Answer - Has a
cone that moves back and forth in relation to the varying current
of the original sound.
The left-hand rule for electromagnetism in a wire states that -
Correct Answer - If you wrap the fingers of your left hand
around the wire with your thumb pointing in the direction of the
current flow, your fingers will be wrapped in the direction of the
magnetic field.
The recording head of a tape recorder is actually a(an) - Correct
Answer - Electromagnet.
20 milliamperes is the same as ________. (Remember, 1
milliampere = 0.001 ampere.) - Correct Answer - 0.02 amperes
The orbital shell that has a maximum electron capacity of 18
electrons is the ___________ shell. - Correct Answer - Third
A semiconductor material - Correct Answer - Has four valence
electrons.
0.5349 divided by 0.1420 = - Correct Answer - 3.7669014
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