NCTI Installer Tech Exam
Which orbital shell has a maximum electron capacity of 18 The third shell
electrons?
Why are semiconductor materials not good conductors nor The valence shells are only half-filled
good insulators?
Which of the following best describes a conductor? Elements that have a small number of electrons in the Valence shell
Which of the following best describes the relationship The number of amperes is equivalent to the number of coulombs passing a given
between an ampere and a coulomb? point during one second
How is electric current produced? From the transfer of energy from valence electron to valence electron because of
applied charges
What prevents the electrons that orbit an atom's nucleus at The attraction between the positive and the negative electron
high speeds from breaking away from the nucleus due to
centrifugal force?
What is 5 kV equivalent to? 5,000 V
Elements without the production or movement of free Insulators
electrons are considered?
What best describes the type of electron flow called Free electrons that change orbits in a random manner, resulting in no charge
random drift?
What is the effective speed of electric current? 186,000 miles per second
What is another way to create an electromagnet besides Wrap a coil of insulated wire around an iron bar and pass an electric current through
stroking a piece of magnetic metal, such as a piece of iron the wire
with another magnet?
Which of the following is true about magnetism? Magnetism was discovered when the Greeks noticed that certain stones attract iron
What happens in a magnetic material where some of the The magnetic field is weaker
magnetic domains are pointing in the same direction?
What determines the strength of an electromagnetic field? An electromagnetic field is determined by the magnitude of mmf
Which of the following is true when talking about overall When created by a straight piece of wire, the overall magnetic field is weaker than
magnetic field? that created by forming loops of wire
, NCTI Installer Tech Exam
Which of the following is one of the five basic rules that flux Flux lines always curve around through the body of the magnet to form complete
lines follow? loops
Magnetic poles that are ___ will ___ each other when Alike, repel
those poles are near each other?
Which of the following is true about a permanent-magnet It has a cone that moves back and forth in relation to the varying current of the
loudspeaker? original sound
What does the left-hand rule for electromagnetism in a If you wrap your fingers of your left hand around the wire with your thumb pointing in
wire state? the direction of the current flow, your fingers will be wrapped in the direction of the
magnetic field
Why are some materials magnetic while others are not? Because in most materials, half of the electrons in each atom spin in one direction
while the other half of the electrons spin in the opposite direction, canceling each
other, which results in no creation of a magnetic field for the atom
(-25) + (42) + (-62) +(20) = ? -25
(17) x (-19) = ? -323
(-17) - (-34) = ? 17
-49/-7 =? 7
(20)/(-4) + (-2) x (-10) - (-2) x (7) = ? 29
3 6/9 + 6 1/3 + 9 5/9 = ? 19 5/9
7 3/ 1/4 = ? 1 1/58
8.13 x 0.123 = ? 0.99999
0..1420 = ? 3.7669014
67.84 + 81.786 + 4281.98 = ? 4,431.606
Which orbital shell has a maximum electron capacity of 18 The third shell
electrons?
Why are semiconductor materials not good conductors nor The valence shells are only half-filled
good insulators?
Which of the following best describes a conductor? Elements that have a small number of electrons in the Valence shell
Which of the following best describes the relationship The number of amperes is equivalent to the number of coulombs passing a given
between an ampere and a coulomb? point during one second
How is electric current produced? From the transfer of energy from valence electron to valence electron because of
applied charges
What prevents the electrons that orbit an atom's nucleus at The attraction between the positive and the negative electron
high speeds from breaking away from the nucleus due to
centrifugal force?
What is 5 kV equivalent to? 5,000 V
Elements without the production or movement of free Insulators
electrons are considered?
What best describes the type of electron flow called Free electrons that change orbits in a random manner, resulting in no charge
random drift?
What is the effective speed of electric current? 186,000 miles per second
What is another way to create an electromagnet besides Wrap a coil of insulated wire around an iron bar and pass an electric current through
stroking a piece of magnetic metal, such as a piece of iron the wire
with another magnet?
Which of the following is true about magnetism? Magnetism was discovered when the Greeks noticed that certain stones attract iron
What happens in a magnetic material where some of the The magnetic field is weaker
magnetic domains are pointing in the same direction?
What determines the strength of an electromagnetic field? An electromagnetic field is determined by the magnitude of mmf
Which of the following is true when talking about overall When created by a straight piece of wire, the overall magnetic field is weaker than
magnetic field? that created by forming loops of wire
, NCTI Installer Tech Exam
Which of the following is one of the five basic rules that flux Flux lines always curve around through the body of the magnet to form complete
lines follow? loops
Magnetic poles that are ___ will ___ each other when Alike, repel
those poles are near each other?
Which of the following is true about a permanent-magnet It has a cone that moves back and forth in relation to the varying current of the
loudspeaker? original sound
What does the left-hand rule for electromagnetism in a If you wrap your fingers of your left hand around the wire with your thumb pointing in
wire state? the direction of the current flow, your fingers will be wrapped in the direction of the
magnetic field
Why are some materials magnetic while others are not? Because in most materials, half of the electrons in each atom spin in one direction
while the other half of the electrons spin in the opposite direction, canceling each
other, which results in no creation of a magnetic field for the atom
(-25) + (42) + (-62) +(20) = ? -25
(17) x (-19) = ? -323
(-17) - (-34) = ? 17
-49/-7 =? 7
(20)/(-4) + (-2) x (-10) - (-2) x (7) = ? 29
3 6/9 + 6 1/3 + 9 5/9 = ? 19 5/9
7 3/ 1/4 = ? 1 1/58
8.13 x 0.123 = ? 0.99999
0..1420 = ? 3.7669014
67.84 + 81.786 + 4281.98 = ? 4,431.606
