INSTALLER TECHNICIAN CONVENTIONAL
QUESTIONS & ANSWERS
Which orbital shell has a maximum electron capacity of 18 electrons? - Answer -Third
Why are semiconductor materials not good conductors nor good insulators? - Answer -
Valance shells are only half filled
What best describes a conductor? - Answer -Elements that have a small number of
electrons in the valence shell.
Which of the following best describes the relationship between an ampere and a
coulomb? - Answer -The number of amperes is equivalent to the number of coulombs
passing a given point during one second.
How is electric current produced? - Answer -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 high speeds from breaking
away from the nucleus due to centrifugal force? - Answer -The attraction between the
positive nucleus and the negative electron.
Elements without the production or movement of free electrons are considered? -
Answer -Insulators
What best describes the type of electron flow called random drift? - Answer -Electrons
moving randomly because of competing continuous negative/positive charges.
What is the effective speed of electric current? - Answer -186,000 miles per second.
An atom is__________when an equal number of its electrons are spinning in opposite
directions, causing the cancellation of all the magnetic fields. - Answer -non-magnetic
When exploring the Earth's magnetism, scientists realized that the geographic and the
magnetic poles in each hemisphere were
________________________________________________. - Answer -not quite in the
same location.
____________ soon became known as a leading stone or lodestone and was used as
the first compass for navigation. - Answer -Magnetite
Small groups of magnetic atoms which tend to form tiny permanent magnets. - Answer
-Magnetic Domains
,The magnetic fields between two closely spaced ____________ wires conducting
current interact with each other in the same way that fields of _______________
magnets interact. - Answer -parallel, permanent
The _____________ of the mmf determines the strength of the field and the number of
lines of flux in the field. - Answer -megnitude
Electromagnet - Answer -a temporary magnet that is made by applying a potential
difference to a wire that is wrapped around a core of magnetic material.
Does the magnetic field around a wire that is conducting current become stronger or
weaker as the distance from the wire increases? - Answer -weaker because the flux
lines are further apart
How do the magnetic fields between two closely spaced parallel wires that are
conducting current interact with each other if the current flow in both wires is in the
same direction? - Answer -They will add together because the flux lines will go in the
same direction, forming loops around the wires. The flux lines will attract one another,
causing the wires to draw together.
Why is the overall magnetic field created by forming loops of wire stronger - Answer -
flux lines are concentrated in the center or core of the loops.
Loudspeaker - Answer -The first magnetic field on this device is a strong, nonmoving
magnetic field generated by a permanent magnet. The second magnetic field results
from the application of current generated by a sound wave to a small coil of wire, known
as the voice coil.
Analog Meter - Answer -This device uses electromagnetic effects to measure the
amount of current in a wire or circuit.
Reed Relay - Answer -Under normal conditions the contacts on these devices are in an
open position, not touching each other. But in the presence of a magnetic field the
contacts close, thus functioning as a switch.
The amount and direction of rotation of the needle pointer in a D'Arsonval meter
movement are _______________ to the amount and direction of the applied current. -
Answer -proportional
What is another way to create an electromagnet besides stroking a piece of magnetic
metal, such as a piece of iron with another magnet? - Answer -Wrap a coil of insulated
wire around an iron bar and pass an electric current through the wire.
What is true about magnetism? - Answer -Magnetism was discovered when the Greeks
noticed that certain stones attract iron.
, What happens in a magnetic material where some of the magnetic domains are pointing
in the same direction? - Answer -The magnetic field is weaker.
What determines the strength of an electromagnetic field? - Answer -The magnitude of
the mmf
T/F When created by a straight piece of wire, the overall magnetic field is weaker than
that created by forming loops of wire. - Answer -True
T/F Flux lines always curve around through the body of the magnet to form complete
loops. - Answer -True
Left-Hand Rule - 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.
T/F Magnetism interacts with electricity because the electron's electrostatic field points
outward. - Answer -False
T/F The overall magnetic field is illustrated by lines of force called flux lines that extend
out into space from the magnet's midpoint between poles in a spiral pattern. - Answer -
False
What are the three parts of a circuit - Answer -Power supply, conductor, load
What is the part of the circuit that provides a difference of potential? - Answer -Power
Source
Direct Current - Answer -continuous electron flow in the same direction.
Alternating Current - Answer -electron flow that periodically changes in direction.
a schematic diagram - Answer -shows the electrical connections of the components or
devices in a circuit.
a parts layout - Answer -shows the physical location of the components or devices in a
circuit.
a block diagram - Answer -shows the circuits as rectangles (and other shapes) and
shows how they relate to one another.
Which of the following protects a circuit from excessive current flow? - Answer -Fuse
What do you call a simple line design representing a component or device in a
schematic diagram? - Answer -A Symbol
QUESTIONS & ANSWERS
Which orbital shell has a maximum electron capacity of 18 electrons? - Answer -Third
Why are semiconductor materials not good conductors nor good insulators? - Answer -
Valance shells are only half filled
What best describes a conductor? - Answer -Elements that have a small number of
electrons in the valence shell.
Which of the following best describes the relationship between an ampere and a
coulomb? - Answer -The number of amperes is equivalent to the number of coulombs
passing a given point during one second.
How is electric current produced? - Answer -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 high speeds from breaking
away from the nucleus due to centrifugal force? - Answer -The attraction between the
positive nucleus and the negative electron.
Elements without the production or movement of free electrons are considered? -
Answer -Insulators
What best describes the type of electron flow called random drift? - Answer -Electrons
moving randomly because of competing continuous negative/positive charges.
What is the effective speed of electric current? - Answer -186,000 miles per second.
An atom is__________when an equal number of its electrons are spinning in opposite
directions, causing the cancellation of all the magnetic fields. - Answer -non-magnetic
When exploring the Earth's magnetism, scientists realized that the geographic and the
magnetic poles in each hemisphere were
________________________________________________. - Answer -not quite in the
same location.
____________ soon became known as a leading stone or lodestone and was used as
the first compass for navigation. - Answer -Magnetite
Small groups of magnetic atoms which tend to form tiny permanent magnets. - Answer
-Magnetic Domains
,The magnetic fields between two closely spaced ____________ wires conducting
current interact with each other in the same way that fields of _______________
magnets interact. - Answer -parallel, permanent
The _____________ of the mmf determines the strength of the field and the number of
lines of flux in the field. - Answer -megnitude
Electromagnet - Answer -a temporary magnet that is made by applying a potential
difference to a wire that is wrapped around a core of magnetic material.
Does the magnetic field around a wire that is conducting current become stronger or
weaker as the distance from the wire increases? - Answer -weaker because the flux
lines are further apart
How do the magnetic fields between two closely spaced parallel wires that are
conducting current interact with each other if the current flow in both wires is in the
same direction? - Answer -They will add together because the flux lines will go in the
same direction, forming loops around the wires. The flux lines will attract one another,
causing the wires to draw together.
Why is the overall magnetic field created by forming loops of wire stronger - Answer -
flux lines are concentrated in the center or core of the loops.
Loudspeaker - Answer -The first magnetic field on this device is a strong, nonmoving
magnetic field generated by a permanent magnet. The second magnetic field results
from the application of current generated by a sound wave to a small coil of wire, known
as the voice coil.
Analog Meter - Answer -This device uses electromagnetic effects to measure the
amount of current in a wire or circuit.
Reed Relay - Answer -Under normal conditions the contacts on these devices are in an
open position, not touching each other. But in the presence of a magnetic field the
contacts close, thus functioning as a switch.
The amount and direction of rotation of the needle pointer in a D'Arsonval meter
movement are _______________ to the amount and direction of the applied current. -
Answer -proportional
What is another way to create an electromagnet besides stroking a piece of magnetic
metal, such as a piece of iron with another magnet? - Answer -Wrap a coil of insulated
wire around an iron bar and pass an electric current through the wire.
What is true about magnetism? - Answer -Magnetism was discovered when the Greeks
noticed that certain stones attract iron.
, What happens in a magnetic material where some of the magnetic domains are pointing
in the same direction? - Answer -The magnetic field is weaker.
What determines the strength of an electromagnetic field? - Answer -The magnitude of
the mmf
T/F When created by a straight piece of wire, the overall magnetic field is weaker than
that created by forming loops of wire. - Answer -True
T/F Flux lines always curve around through the body of the magnet to form complete
loops. - Answer -True
Left-Hand Rule - 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.
T/F Magnetism interacts with electricity because the electron's electrostatic field points
outward. - Answer -False
T/F The overall magnetic field is illustrated by lines of force called flux lines that extend
out into space from the magnet's midpoint between poles in a spiral pattern. - Answer -
False
What are the three parts of a circuit - Answer -Power supply, conductor, load
What is the part of the circuit that provides a difference of potential? - Answer -Power
Source
Direct Current - Answer -continuous electron flow in the same direction.
Alternating Current - Answer -electron flow that periodically changes in direction.
a schematic diagram - Answer -shows the electrical connections of the components or
devices in a circuit.
a parts layout - Answer -shows the physical location of the components or devices in a
circuit.
a block diagram - Answer -shows the circuits as rectangles (and other shapes) and
shows how they relate to one another.
Which of the following protects a circuit from excessive current flow? - Answer -Fuse
What do you call a simple line design representing a component or device in a
schematic diagram? - Answer -A Symbol
