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Chapter 9
Multiple Choice
Multiple Choice
This activity contains 13 questions.
A capacitor has 25 V across its plates and a stored charge of 1500
C. What is the capacitance value?
60 pF
60
F
16.67 mF
37.5 mF
Which of the following determines the capacitance of a capacitor?
Plate area, dielectric strength, and plate separation
Voltage rating, dielectric constant, and temperature coefficient
Temperature coefficient, plate area, and plate separation
Plate area, dielectric constant, and plate separation
What is the capacitance of the circuit shown in
Figure 1
?
0.066
F
0.9
F
65.97 pF
900 pF
Which of the following statements is true?
The voltage a capacitor is charged to can change instantaneously.
The current in a capacitive circuit takes time to change.
A fully charged capacitor appears as a short to dc current.
An uncharged capacitor appears as a short to an instantaneous change in current.
How long would it take the capacitor in
Figure 2
to completely charge if the switch was in position 1?
22 ms
69 ms
345 ms
440 ms
How long would it take the capacitor in
Figure 2
to completely discharge if the switch was in position 2?
22 ms
69 ms
345 ms
420 ms
In a purely capacitive circuit,
current leads voltage by 90°
voltage leads current by 90°
current lags voltage by 90°
current and voltage have a phase relationship of 0°
The quantity that represents an ideal capacitor dissipating 0 W of power is
instantaneous power
true power
reactive power
resistive power
What is the reactive power in
Figure 3
?
0 VAR
691
VAR
44.23 mVAR
1.45 kVAR
Which material has the highest dielectric strength?
Air
Paper
Mica
Oil
In a capacitive circuit, current flow is limited to
charging periods
discharging periods
neither charging periods nor discharging periods
both charging periods and discharging periods
What is the value of a capacitor labeled 102?
10,000 pF
1000 pF
1000
F
10,000
F
Capacitive reactance values connected in series offer
an increase in total
X
C
a decrease in total
X
C
no change in total
X
C
total opposition to voltage in the circuit
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