NCTI Installer Tech/November question with complete solution 2023
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NCTI Installer Tech/November question with complete solution 2023Why do only the outer electrons leave their orbit shells? - correct answer Only outer electrons leave their orbit shells because electrons farthest from the nucleus are more easily freed from their orbits due to a weaker electrostatic...
NCTI Installer Tech/November question
with complete solution 2023
Why do only the outer electrons leave their orbit shells? - correct answer Only outer electrons leave
their orbit shells because electrons farthest from the nucleus are more easily freed from their orbits due
to a weaker electrostatic force.
What is required to have a balanced (or stable) atom? - correct answer The number of electrons must
equal the number of protons in order to have a balanced atom.
List the capacity of each of the first four orbital shells of an atom. - correct answer Shell: #1 = 2 electrons;
#2 = 8 electrons; #3 = 18 electrons; and #4 = 32 electrons.
What is the maximum electron capacity of a valence shell? - correct answer A valence shell can hold a
maximum of eight electrons.
Electrons in orbits nearest the nucleus contain _________ energy than those in more distant orbits. -
correct answer Electrons in orbits nearest the nucleus contain less energy than those in more distant
orbits.
What will happen to a valence electron that has enough energy added to it? - correct answer A valence
electron that has enough energy added to it will move away from its atom.
What major factor determines which category a particular element belongs? - correct answer The
number of electrons in the valence shell determines the element category.
How many valence electrons are there in a good conductor? - correct answer A good conductor has only
one or two valence electrons.
List gold, silver, and copper in the order of best conductivity. (List the best conductor first.) - correct
answer #1 Silver; #2 Copper; #3 Gold
,Why do metals that each have only one valence electron differ in their conductivity? - correct answer
Metals that each have one valence electron differ in their conductivity because of the way their atoms
pack together into a solid structure.
Describe the two characteristics of an insulator. - correct answer The two characteristics of an insulator
are as follows:
1. Its valence shell is almost filled and tends to be fairly stable.
2. It tries to finish filling its valence shell by capturing additional free electrons.
How many valence electrons are in a semiconductor? - correct answer A semiconductor has four valence
electrons.
Name the two types of electron current flow. - correct answer Random drift and directed flow are the
two types of electron current flow.
What causes electrons to be knocked loose and travel randomly from one atom to another? - correct
answer The movement of atoms in materials that are conductors and the agitation as they collide cause
electrons to be knocked loose and travel randomly from one atom to another.
What can force electrons to all move in the same direction? - correct answer Applying a negative charge
to one end of the wire and a positive charge to the other can force electrons to all move in the same
direction. The electrons in the wire will travel toward the positive charge as they are directed by the
effects of the unlike charges.
What actually produces electric current? - correct answer The transfer of energy from valence electron
to valence electron, as a result of applied charges, is what actually produces electric current.
How does the speed of electric current compare to that of electron travel? - correct answer The effective
speed of electric current (186,000 miles per second) is much faster than the actual speed of electron
travel (a few hundred miles per second).
,How many electrons are in one coulomb? - correct answer A coulomb is equal to 6.28 × 1018 electrons.
What is the basic measurement unit of electron current? - correct answer The ampere is the basic
measurement unit for electron current.
Define ampere in terms of coulombs. - correct answer An ampere is equal to 1 coulomb passing a given
point during 1 second.
Name the three terms that are used interchangeably to refer to the force that causes current flow. -
correct answer Potential difference, electromotive force (emf), and voltageare used interchangeably to
refer to the force that causes current flow.
Define electromotive force (emf). - correct answer Emf is the electrical force that motivates electrons to
move in a wire.
What does the term potential difference mean? - correct answer Potential difference is the algebraic
difference between the electrical individual potentials of two points.
What is the potential difference between two negative charges of equal value? - correct answer The
potential difference between two negative charges of equal value is zero. There is no potential
difference.
What is the unit used to indicate the strength or size of the potential difference? - correct answer The
volt is the unit used to indicate the strength or size of the potential difference.
Define a volt in terms of current and resistance. - correct answer One volt is the amount of force
required to produce a current of 1 ampere through a resistance of 1 Ω.
What are three alternate ways to express 5 µV and 3 mA? - correct answer 5 microvolts, 5/1,000,000 volt
or 0.000005 volt, and 3 milliamperes, 3/1,000 ampere or 0.003 A.
What are two alternate ways to express 2 megavolts? - correct answer 2 MV or 2 million volts.
, What are two alternate ways to express 4 kilovolts? - correct answer 4 kV or 4,000 volts.
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.
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.
What would happen if you suspended magnetite by a string and allowed it to swing freely? - correct
answer Magnetite will always align itself in a north and south direction when you suspend it by a string
and allow it to swing freely.
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