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NCTI Installer Technician: Q&A
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NCTI Installer Technician: Q&A
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NCTI Installer Technician20 milliamperes is the same as ________. (Remember, 1 milliampere = 0.001
ampere.) Correct Ans - 0.02 amperes
The orbital shell that has a maximum electron capacity of 18 electrons is the
___________ shell. Correct Ans - Third
A semiconductor material Correct Ans - Has four valence electrons.
The major factor for determining whether a particular element is a conductor,
a semiconductor, or an insulator is Correct Ans - The number of
electrons in the valence shell.
Elements that are called conductors Correct Ans - Have very few
valence electrons.
The term voltage normally refers to Correct Ans - The measurement of
the difference in potential between two charges.
The ampere Correct Ans - Indicates how many coulombs pass a given
point during 1 second.
Electric current is actually produced by Correct Ans - 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 Ans -
The attraction between the positive nucleus and the negative electron.
5 kilovolts is the same as Correct Ans - 5 kV.
To create an electromagnet, Correct Ans - Wrap a coil of insulated wire
around an iron bar and pass an electric current through the wire.
Magnetism Correct Ans - Was discovered when the Greeks noticed
that magnetite always aligned itself in a north and south direction.
,In a magnetic material, Correct Ans - 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 Ans - Determined
by the magnitude of the magnetomotive force (mmf).
The magnetic field Correct Ans - Created by a straight piece of wire is
weaker than that created by forming loops of wire.
Flux lines Correct Ans - 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 Ans - Alike, repel
A permanent-magnet loudspeaker Correct Ans - 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 Ans
- 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 Ans -
Electromagnet.
(-25) + (42) + (-62) + (20) = Correct Ans - -25
(-17) - (-34) = Correct Ans - 17
(17) x (-19) = Correct Ans - -323
-49/-7 = Correct Ans - 7
(20) / (-4) + (-2) x (-10) - (-2) x (7) = Correct Ans - 29
3 6/9 + 6 1/3 + 9 5/9 = Correct Ans - 19 5/9
, 4/7 x 9 4/11 = Correct Ans - 5 27/77
7 3/8 divided by 7 1/4 = Correct Ans - 1 1/58
13 X 0.123 = Correct Ans - 0.99999
0.5349 divided by 0.1420 = Correct Ans - 3.7669014
Which of the following is a true axiom? Correct Ans - When A = C and B
= C, then A = B because both are equal to C, which supports the axiom:
Quantities equal to the same quantity are equal to each other.
Simplify and solve the equation: If E = IR then what is the formula for finding
I? Correct Ans - E/R.
The square of 7 = _____. Correct Ans - 49
The square root of 81 = _____. Correct Ans - 9
0.00004 = ______ x 10 to the power of ______. Correct Ans - 4, -5
(75 x 10^3)+(25 x 10^4) = ____. Correct Ans - 32.5 x 10^4
(480 x 10^-5) / (60 x 10^-3) = _____. Correct Ans - 8 x 10^-2
10 to the power of -3 has a metric prefix of ______. Correct Ans - Milli
(250 x 10^-6) - (7 x 10^-5) = _____. Correct Ans - 180 x 10^-6
(75 x 10^3) + (2.5 x 10^4) = ____. Correct Ans - 100 x 10^3
What are the three basic elements of an electrical circuit? Correct Ans -
A power source, a load, and the connecting conductors.
The power source Correct Ans - Is the part of an electrical circuit that
provides a difference of potential.
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