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