AC Circuits Test Questions with Revised Answers
Classification of capacitor relating to circuit function - Answer-feed-through, filter, padder, trimmer, tuning, stand-off
filter capacitors - Answer-high value capacitors used to flatten out pulsations in dc voltages
polarized capacitor, curv...
AC Circuits Test Questions
with Revised Answers
Classification of capacitor relating to circuit function - Answer-feed-through, filter,
padder, trimmer, tuning, stand-off
filter capacitors - Answer-high value capacitors used to flatten out pulsations in dc
voltages
polarized capacitor, curved plate symbol means - Answer-negative terminal of the
capacitor
Time Constant - Answer-time obtained by multiplying resistance by capacitance
When capacitor is charging, a time constant represents the time required for the
capacitor to charge to - Answer-63.2 percent of the available voltage
the phase relationship in a capacitive AC circuit is - Answer-current leads voltage by 90
degrees
a capacitor's opposition to alternating current - Answer-reactance
term used to rate a capacitor on its ability to produce reactance with as little resistance
as possible - Answer-quality
doubling the plate area of a capacitor will cause the capacitance to - Answer-double
doubling the frequency of a capacitor circuit will cause - Answer-the current to double
the ability to store energy in the form of electric charge - Answer-capacitance
base unit of capacitance - Answer-farad
4 factors that determine capacitance - Answer-area of plates, distance between plates,
type of dielectric material, temperature
type of capacitor provides more capacitance for their size and weight - Answer-
electrolytic
method used to produce electrolytic capacitors results in the plates being - Answer-
polorized
combined opposition offered by resistance and reactance - Answer-impedance
Doubling the distance between the plates of a capacitor will cause the capacitance to -
Answer-halve
Doubling the distance between the plates while also doubling the plate area will cause
the capacitance to - Answer-remain the same
Doubling the voltage of a capacitor circuit will cause - Answer-current to double
shields often used to protect inductors from the influence of magnetic fields are made
from - Answer-magnetic materials
most large inductors used at power frequencies use - Answer-laminated iron cores
inductors used at higher frequencies are often called - Answer-RF chokes
Rating of an inductor - Answer-quality, dc resistance, inductance, current, voltage,
tolerance
the high voltage generated when an inductive circuit is opened is known as - Answer-
inductive kick
opposition of an inductor to AC is called - Answer-reactance
current and voltage phase relationship in an ideal inductor - Answer-voltage leads
current by 90 degrees
the combined opposition offered by resistance and reactance - Answer-impedance
the time required for the current through the resistor-inductor to rise to 63.2 percent of
its final value is called a - Answer-time constant
when the magnetic flux from one conductor induces a voltage in another electricity
isolated conductor, it is called - Answer-mutual inductance
which law states that a cemf always has a polarity that opposes the force that created it
- Answer-lenz's law
what affects the output voltage of an ac generator - Answer-1. the number of turns in
the armature coils
2. the speed at which the coils rotate
3. the flux density of the magnetic field
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