ACDC Ch. 11 & 12
Cermaic capacitors have capacitance that range from 1 pF to ((.01))
.01
Precision inductors have a tolerance of +- __________%
1
Typically, the letter M in a IEC code represents a tolerance of ___________ %
20
With an inductor, if coils are wound on a closed core, inductance is increased by about __________ times over the inductance of a straight core.
2000
Paper capacitors are commonly used in circuits where max voltage ranges from 600 V to ___________ V
800
Dielectric constant is also referred to as specific inductive capacity or ___________
Capacitivity
The most commonly used capacitors are ___________ capacitors
Ceramic
___________ capacitors are the most commonly used capacitors
Ceramic
A ___________ is the quantity of electric charge that passes any cross-section of a conductor in one second when the current is maintained at 1A
Coulomb
most paper capacitors are maade in a ___________ design
Cylindrical
___________ breakdown iis the breakdown of insulation between the plate of a capacitor
Dielectric
___________ is the ability of a dielectric material to withstand voltage applied across it during a breakdown.
Dielectric strength
___________ current is current that exists in addition to normal current
Displacement
An ___________ is a nonmetallic electric conductor in which curren is carried by the movement of ions
Electrolyte
T or F A trimmer capacitor is connected in series with a larger tuning capacitor
F
T or F An advantage of a varicap capacitor is minimal noise generation during operation
F
T or F Capacitor losses typically occur through the insulation
F
T or F Capacitors can be connected together in series so that their capacitance add together
F
T or F Dipped tantalum capacitors have low capacitance and high voltage ratings
F
T or F Electrolytic capacitors have a max voltage rating of 250VDC
F
T or F Electrolytic capacitors have the lowest leakage current of all types of capacitors
F
T or F Oil filled capacitors smaller than oil impregnated
F
T or F When combining capacitors connected in parallel, dielectric thickness increases
F
An ___________ is equal to the capacitance of the accumulated charge of one coulomb for each volt applied
Farad
For circuits with capacitors connected in series/parallel, values of the ___________- connected capacitors are determined first.
Farthest from source
The two types of capacitor losses are dielectric leakage current and ___________ loss
Hysteresis
Capacitance of parallel plates is dependent on the type of ___________ material used.
Insulating
An ___________ is an electrically charged atom.
Ion
___________ capacitors are sometimes referred to as glass capacitors
Mica
__________ inductors are inductors that most resemble resistors and have color codes to indicate their value.
Molded
a __________ inductor is usually covered in plastic with a conductor at each end for connecting or soldering into a circuit
Molded
An __________ coil has more than one layer of turns and is wound on an air-core form
Multi layer
An __________ is a coil that has more than one layer of turns and is wound on an air-core form.
Multilayer
__________ inductance is the effect of on coil inducing a voltage into another coil.
Mutual
__________ __________ is the effect of one coil inducing voltage into another coil
Mutual inductance
A ___________capacitor is a small adjustable capacitor that is connected in series in the tuning circuit of a radio
Padder
A ___________is a small adjustable capicitor that is connected in series in the tuning circuit of a radio
Padder capacitor
A ___________ capacitor has thin sheets of metallic foil, which act as plates, separated by waxed paper, which acts as the dielectric
Paper
An __________ inductive circuit has both resistance and inductance
Practical
Molded inductors are sometimes referred to as __________ inductors
Radial
an __________ choke is an inductor designed for high impedance over large frequency ranges
Radio frequency
Dielectric leakage current results from the dielectric having high ___________
Resistance
Capacitance of a circuit is affected by all of the following except ___________.
Shape of the plate
an inductor __________ prevents the magnetic field of the coil from escaping and affecting other circuits.
Shield
A __________ inductor is an inductor contained in a shield composed of low resistance magnetic material brought to ground potential.
Shielded
A capacitor that offers high capacitance in a small volume is a ___________
Supercapacitor
T or F A capacitor reaches full charge after five time constants
T
T or F A fully charged supercapacitor can have its terminals short circuited without any harmful effects on the capacitor
T
T or F A resistive-capacitive time constant is the amount of time required for a capacitor to charge to 63.2% of the max voltage across a resistive capactive circuit
T
T or F Capacitance is directly proportional to the size of the capacitor plates.
T
T or F Electromotive force is defined as Electrical pressure applied to a circuit.
T
T or F High value inductors are used for higher frequency applications such as in raido and television circuits.
T
T or F Oil-filled capacitors can contain porcelain or glass
T
T or F Oil-impregnated paper used with certian types of dielectrics prevents arcing between the plates of an oil cpacitor.
T
T or F There is no current limit when charging a supercapacitor
T
T or F When analyzing a circuit with capacitors connected in both series and parallel, the values of the parallel-connected capacitors are determined first and then added to the equivalent values of the series-connected capacitors
T
T or F an electrolyte can be in the form of a liquid or paste
T
T or F if a dry electrolytic capacitor were to become totally dry, the capacitor would not function.
T
A resistive capacitive ___________ is the amount of time required for the capacitor to charge to 63.2% of the max voltage across the circuit
Time constant
A ___________ is a variable solid-state diode that operates under reverse bias
Varicap capacitor
An ___________ is an electrical device designed to store electrical energy by means of an electrostatic field.
capacitor
The __________ __________ __________ is the % of magnetic lines of force created by one coil that cut the windings of the second coil
coefficient of coupling
a ___________ is the quantity of electric charge that passes any cross-section of a conductor in one second when the current is maintained at 1 A.
coulomb
Capacitor losses typically occur through the ___________
dielectric
___________ current is the small amount of current that flows through insulation
leakage
An ___________ can be used to test the reliability of a capacitor
ohmmeter
with a charged capacitor, the electron orbits become stretched toward the ___________ charged plate
positively
___________ is a hard metallic material that is resistant to acid and is used to manufacture capacitors
tantalum
A ___________ is a capacitor used wit ha larger variable capacitor to fine-tune the overall capacitance of the circuit
trimmer capacitor
A ___________ capacitor is constructed so that the capacitance values within the capacitor can be changed
variable
___________ is the maximum voltage that can be safely applied to a capacitor
working voltage
High induced voltage is an energy release caused by the __________ in an inductive circuit
Coil
__________ is the property of a conductor to oppose any change in current.
Counter electromotive force
__________ force always opposes current change in a conductor
Counter-electromotive
T or F A greater number of coil layers on a core will produce a lower inductance.
F
T or F A large diameter core has less inductance than a small diameter core.
F
T or F A resistive circuit contains only inductance
F
T or F A variometer consists of two movable coils
F
T or F Capacitors can be connected in a series or parallel circuit but not in a series/parallel combination circuit
F
T or F Ceramic capacitors are often referred to as self-healing capacitors
F
T or F Compared to other types of capacitors, aluminum electrolytic capacitors have low leakage current.
F
T or F Dielectric is a conductor of DC current.
F
T or F For coils with iron cores the premeability is constant.
F
T or F Inductance of 1H or less is unsuitable for most circuit applications involving frequencies higher than the audio range of 15 Hz to 20 kHz.
F
T or F Inductive reactance is the opposition of an inductor to direct current
F
T or F Inductor coils are typically uninsulated
F
T or F Inductors are only connected in series
F
T or F Inductors are usually rated in terms of inductance measured in ohms.
F
T or F Inductors used in electrical and electronic equipment typically have tolerances of +-5%
F
T or F Mica can withstand voltages up to 9.5 kV
F
T or F Most capacitors have capacitance units in picofarads only
F
T or F Multilayer coils are referred to as solenoids
F
T or F Mutual inductance is measured in gauss
F
T or F Radio frequency chokes are designed for low impedance over small frequency ranges
F
T or F The core material used in an inductor typically has no affect on inductance
F
T or F The four groups of coil styles are single-layer coil, multilayer coil, cake coil and chip coil.
F
T or F The maxwell is a unit of measure equal to the amount of voltage induced per the rate of current change
F
T or F The same number of turns on a longer-length core has the same inductance and are purely inductive.
F
T or F The thickness of the dielectric of a capacitor does not affect total capacitance.
F
T or F There are three types of capacitors
F
T or F Usually, variable capacitors use thin metal film technology as the dielectric
F
T or F capacitvity is another name for dielectric breakdown
F
T or F dielectric constant and dielectric strength are the same thing.
F
T or F in a capacitve circuit with DC voltage applied, current flows when capacitve voltage equals the source voltage.
F
T or F the outside plate of an oil capacitor is usually marked with a series of colored bands
F
Molded inductors may have air, powdered iron, or __________ cores.
Ferrite
the __________ is the unit of inductance equal to the voltage induced per rate of current change.
Henry
An __________ inductive circuit has an inductor connected to a battery through a switch
Ideal
Abrupt removal of power from a circuit often causes coils to fail because of __________ kick.
Inductive
A __________ is an inductor that has coils wound in such a manner that the inductance created by one coil turn is canceled by adjacent coil turn.
Inductive coil
__________ is the energy release in a coil anytime the inductive current is abruptly stopped or reversed.
Inductive kick
An __________ is a passive device that stores energy in the form of a magnetic field.
Inductor
A __________ coil is a short coil with only a few conductor turns along its length.
Pancake
The ability of a material to carry magnetic lines of force is referred to as __________
Permeability
Inductive __________ is the opposition of an inductor to AC
Reactance
__________ is the property of a conductor to induce voltage within itself due to changes in current
Self inductance
T or F Permeablility may be expressed as the ratio of the number of magnetic lines of force that pass through a given type of material as compared to the number of magnetic lines of force that pas through air of the same area
T
T or F A coiled conductor has more inductance than a straight conductor.
T
T or F A pancake coil is also known as a flat sprial coil.
T
T or F A polarized capacitor has separate negative and positive connection leads
T
T or F A supercapacitor is often used as a battery replacement because it has characteristics similar to those of a battery
T
T or F An inductor may be shielded in an electrical circuit to prevent the interaction of magnetic fields.
T
T or F Because the farad is too large a unit of measure for average capacitor applications, picofarads and microfarads are often used.
T
T or F Counter-electromotive fore is also referred to as back-electromotive force
T
T or F Displacement current is current that exists in additon to normal current.
T
T or F In a resistive circuit with DC voltage applied, current flow ceases even through the dielectric.
T
T or F In actual electrical applications, it is nearly impossible to attain a coeffecient of 1
T
T or F Leakage current is typically considered undesirable because it flows through the dielectric.
T
T or F Mica capacitors are sometimes referred to as glass capacitors
T
T or F Mutual inductance is measured in henrys
T
T or F Noninductive coil inductors can be used in an application that requires a circuit to be resistive in nature.
T
T or F Paper capacitors are waxed in a paraffin coating for electrical insulation.
T
T or F Realistically, some resistance and capacitance are always present in an ideal inductive circuit
T
T or F Single-layer coils are also referred to as solenoids.
T
T or F The stronger the magnetic field generated by an inductors coil the greater the inductance value
T
T or F Tubular paper capacitors have six colored bands used for identification purposes.
T
T or F Unlike other coils, the magnetic field of a toroid coil is confined to its core.
T
T or F Wheeler's formula is the formula used to determine inductance for each inductor coil style.
T
T or F capacitance is the ability of a component or circuit to store energy in the form of an electrical charge.
T
T or F ideal inductive circuits are circuits that have no resistance or capacitance and are purely inductive.
T
T or F insualation can be classified as solid or fluid
T
T or F leaded capacitors are a form of aluminum electrolytic capacitors.
T
T or F on a radio frequency choke, a series of four dots may be used instead of bands to indicate the inductance and tolerance for small units.
T
T or F the thicker the dielectric, the greater the voltage it can withstand
T
A __________ inductor has an inductance varied by its core
Variable
An __________ is an inductor that consists of two coils, one fixed and on movable.
Variometer
Unlike other types of inductor coils, the magnetic field of an __________ coil is confined to the core.
toroid
Inductance is affected by all of the following except core __________
Age
For applications in electrical and electronic equipment, the length of an inductor's coil is generally not greather than __________ times its diameter or width
10
A max current rating is typically give for inductors of __________ H and greater.
15
An __________ circuit is a circuit that has an ideal inductor connected to a battery through a switch
ideal inductive
When inductors are connected in parallel, total circuit current __________
increases
A solenoid is an electric output device that converts electrical energy into __________ mechanical force
linear
The __________ is the time required for current in an inductive resistive circuit to reach 63.2% of its max value after power is applied to the circuit or to decrease by 63.2% when the power is removed from the circuit
time constant
