yes
what is the minimum dc working voltage rating for a capacitor that must drop 120 Vrms
170V
if a 4.7uf capacitor operates at 10khz Xc equals
3.39ohms
Inductive reactance decreases as frequency increases.
false
The total inductance of two parallel inductors equals the sum of their inductance values.
false
An inductor is placed in series with the load for power supply filtration.
true
a capacitor will fully charge in about five time constant
true
Determination of an inductor's value can be had by what method(s)?
All of these
Which type of inductor core material is likely to produce the least inductance?
air
The voltage and current are in phase in an inductive circuit.
false
efficient filtering is directly related to rc time constant
true
what time will capacitance reach full charge
5xRxC
Inductors ________.
c. pass direct current
Stray capacitance for a coil becomes a problem:
c. with high frequencies.
a capacitor that transfersan ac signal from one stage to another is called a _____capacitor
coupling
The time constant of an inductor is:
d. all of these.
The output at the cutoff frequency of a low pass RL filter is 0 V.
false
The voltage leads the current in an inductive circuit.
true
leakage through a capacitor in undesirable
true
The ripple voltage as measured at the output of a power supply has increased. Which of the following could be the problem?
va. partial shorting of the windings of the filtering coil b. resistance of the coil has decreased c. either A or B
If an inductor, resistor and switch are connected in series to a 12 V battery, what is the magnitude of the inductor's voltage at the instant that the switch is closed?
vb. 12 V
If the resistance decreases in an RL filter circuit, the cutoff frequency increases.
false
The energy stored in an inductor's electromagnetic field is produced by the resistance of the inductor's winding.
false
An RL lag network is similar to a:
low pass filter
An inductor passes direct current and opposes alternating current.
true
what is one time constant if 4.7uf capacitor in series wiht a 22kQ resistor
103ms
If the inductance increases in an RL filter circuit, the cutoff frequency increases.
True
A high-pass filter passes high frequencies and blocks low frequencies.
true
if a 0.05uf and a 0.1uf capacitor are connected in parrallelacross a 20 v source the total capacitance equals ______ and each capacitor drops
0.15uf and 20V
if a 0.022 uf 0.022uf and a 0.05uf capacitor are connected ins eries acrossa 25V source the voltage drops across the largest capacitor equals
4.55V
How many time constants will it take to completely collapse an inductor's magnetic field?
5
what is one time constant of a 47uf capacitor in series wiht a 120k Resistor
5.64s
It has been determined that the source of audible noise for a radio is du to the power supply voltage. How can an inductor be configured to eliminate this noise?
An inductor will not affect the noise. c. Connect the inductor in series with the radio power wire.
Do iron-core inductors or air-core inductors generally have the larger inductance?
IRON CORE
When a DC voltage is first applied to an inductor, the initial circuit current is zero.
True
In a RL circuit, the inductive reactance is:
a. all of these.
In a series RL circuit, as the phase angle between the applied voltage and the total current increases, this is the same as:
a. power factor decreasing.
When inductors are connected in parallel, their total inductance acts like:
a. resistance connected in parallel.
In an RL filter circuit, the cutoff frequency is defined as the frequency at which:
a. the output voltage drops to 70% of maximum.
Power in an RL circuit can be measured as:
a. true power (P true). b. apparent power (P a). c. reactive power (P r). d. all of these.
When an ac voltage is supplied to an RL circuit, the ac's current and amplitude will be:
a. varying in the same manner. b. all of these. c. lagging the voltage. d. similar in waveform.
If two inductors are connected in a series AC circuit, which inductor drops more voltage?
b. the larger inductance
An 0.05 μH inductance is larger than a ________.
c. 0.000000008 H inductance
The most commonplace use for inductors in electronics:
c. blocks AC voltages.
If an inductor has an ac current flowing through it, the magnetic field is ________.
c. constantly changing
An RL high pass filter takes its output across:
c. the series inductor.
When inductors are connected in series, their total inductance acts like:
d. resistance connected in series.
if the frequency applied to a capacitor increases the capacitive reactance
deacreases
A low-pass filter passes high frequencies and blocks other frequencies.
false
An ohmmeter can be used to accurately test the impedance of an RL circuit.
false
If the frequency increases in an RL circuit, the impedance decreases.
false
The impedance of a series RL circuit is found by directly adding the values of XL and R.
false
The impedance of an RL series circuit varies inversely with the frequency.
false
The quality factor for an inductor becomes more apparent at higher frequencies.
false
The source voltage always lags the total current in an RL circuit.
false
capacitance is the ability to store voltage
false
the voltage rating of a capacitor indicates the voltage it will charge up to
false
when two capacitors are connected in parallel across a dc source the smaller capacitor drops the large voltage
false
capacitance is a capacitors ability to store resistance
false`
An iron-core inductor is used in low frequency applications.
true
If an inductor is placed in an ac circuit, the ac voltage across the inductor leads the ac current through it.
true
Inductors in series or parallel combine just like resistors in series or parallel.
true
Power dissipated by the resistor in a parallel RL circuit can be increased with the addition of a capacitor in parallel.
true
The energy stored in an inductor's electromagnetic field is produced by the inductor's current.
true
The impedance of a series RL circuit is found by adding the values of XL and R using a phasor diagram.
true
The source voltage always leads the total current in an RL circuit.
true
if the distance between the plates of a capacitor increases the capacitance decreases
true
a capacitor blocks dc and passes ac
truewhen two capacitors are cpnnected in parrallel across a dc source the smaller cpacitor drops thenlarge voltage