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Electrical Engineering
Capacitors
Quiz 4
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Q.1
A 0.F capacitor equals how many micro-farads?
22 µF
220 µF
2,200 µF
22,200 µF
Q.2
Two series capacitors (one 2 µF, the other of unknown value) are charged from aV source. The 2 µF capacitor is charged toV and the other to 8 V. The value of the unknown capacitor is
1 µF
2 µF
4 µF
8 µF
Q.3
The ohm is the unit of capacitance.
True
False
Q.4
Four 0.µF capacitors are in parallel. The total capacitance is
0.15 µF
0.30 µF
0.6 µF
0.8 µF
Q.5
AµF,µF,µF, andµF capacitor are in parallel. The total capacitance is
2.43 µF
4.86 µF
100 µF
152 µF
Q.6
A 4.7 MΩ resistor is in series with a 0.µF capacitor. The combination is across aV source. How long does it take the capacitor to fully charge?
35 ms
352 ms
3.5 ms
70.5 ms
Q.7
AΩ resistor is in series with a 2.2 µF capacitor. The time constant is
48 µs
480 µs
2.42 µs
24 µs
Q.8
Of the following capacitors, which one has the highest dielectric constant?
Air
Mica
Glass
Paper
Q.9
Total parallel capacitance is less than that of the smallest capacitor in parallel.
True
False
Q.10
An uncharged capacitor and a 1 kΩ resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor is
6 V
3 V
2 V
0 V
Q.11
Capacitance is directly proportional to plate area and plate separation.
True
False
Q.12
XC is inversely proportional to frequency and capacitance.
True
False
Q.13
Energy is stored by a capacitor in a magnetic field.
True
False
Q.14
A 0.µF capacitor equals how many picofarads?
100 pF
1,000 pF
10,000 pF
100,000 pF
Q.15
The dielectric constant is the ability of a material to establish an electric field.
True
False
Q.16
A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased
VR > VC
VC > VR
VR = VC
VR and VC = 0
Q.17
When the voltage across a capacitor is tripled, the stored charge
Triples
Is cut to one-third
Stays the same
Doubles
Q.18
A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current
Increases
Remains constant
Decreases
Ceases
Q.19
Which of the following capacitors is polarized?
Mica
Ceramic
Plastic-film
Electrolytic
Q.20
A 2 µF, a 4 µF, and aµF capacitor are connected in series. The total capacitance is less than
2 µF
4 µF
10 µF
1.5 µF
0 h : 0 m : 1 s
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