Chapter 15: Capacitive AC Circuits
MULTIPLE CHOICE
1. In a capacitive AC circuit, when the voltage starts to increase, current is at ____ because the capacitor
is discharged.
a.
minimum
c.
zero
b.
maximum
d.
one
2. In a capacitive AC circuit, the relationship between current and voltage is described as ____ degrees
out of phase.
a.
30
c.
90
b.
60
d.
180
3. Capacitive reactance is measured in ____.
a.
ohms
c.
hertz
b.
farads
d.
watts
4. Increasing the frequency ____ the capacitive reactance, resulting in ____ current flow.
a.
decreases, lesser
c.
increases, lesser
b.
decreases, greater
d.
increases, greater
5. When capacitors are connected in series, the capacitive reactance is equal to the ____.
a.
product of the reciprocals of the individual capacitive reactance values
b.
product of the individual capacitive reactance values
c.
sum of the reciprocals of the individual capacitive reactance values
d.
sum of the individual capacitive reactance values
6. When capacitors are connected in parallel, the reciprocal of the capacitive reactance is equal to the
____.
a.
product of the reciprocals of the individual capacitive reactance values
b.
product of the individual capacitive reactance values
c.
sum of the reciprocals of the individual capacitive reactance values
d.
sum of the individual capacitive reactance values
7. A ____ allows low frequencies to pass with little opposition while attenuating the high frequencies.
a.
low-pass filter
c.
decoupling network
b.
high-pass filter
d.
coupling network
8. A ____ permits frequencies above the cut-off point to pass while attenuating frequencies below the
cut-off point.
a.
low-pass filter
c.
decoupling network
b.
high-pass filter
d.
coupling network
9. A ____ allows the DC signal to pass while attenuating or eliminating the AC signal.
a.
low-pass filter
c.
decoupling network
b.
high-pass filter
d.
coupling network
10. A ____ allows the AC signal to pass while blocking the DC voltage.
a.
high-pass filter
c.
decoupling network
b.
low-pass filter
d.
coupling network
COMPLETION
1. The opposition that the capacitor offers to the applied AC voltage is called ____________________.
2. In an AC circuit, a capacitor is an effective way of controlling ____________________.
3. Capacitors can be used alone or combined with resistors to form ____________________ networks.
SHORT ANSWER
1. Describe the relationship between the current and voltage in a capacitive AC circuit.
2. Describe how a low-pass filter works.