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Capacitors Online Exam Quiz

Important questions about Capacitors. Capacitors MCQ questions with answers. Capacitors exam questions and answers for students and interviews.

1. A 0.00022 F capacitor equals how many microfarads?

Options

A : 22 µF

B : 220 µF

C : 2,200 µF

D : 22,200 µF

2. Of the following capacitors, which one has the highest dielectric constant?

Options

A : air

B : mica

C : glass

D : paper

3. A 4.7 M? resistor is in series with a 0.015 µF capacitor. The combination is across a 12 V source. How long does it take the capacitor to fully charge?

Options

A : 35 ms

B : 352 ms

C : 3.5 s

D : 70.5 ms

4. A 12 kHz voltage is applied to a 0.33 µF capacitor, and 200 mA of rms current is measured. What is the value of the voltage?

Options

A : 8 V

B : 80 V

C : 80 mV

D : 800 mV

5. A 10 µF, 20 µF, 22 µF, and 100 µF capacitor are in parallel. The total capacitance is

Options

A : 2.43 µF

B : 4.86 µF

C : 100 µF

D : 152 µF

6. Which of the following capacitors is polarized?

Options

A : mica

B : ceramic

C : plastic-film

D : electrolytic

7. When the voltage across a capacitor is tripled, the stored charge

Options

A : triples

B : is cut to one-third

C : stays the same

D : doubles

8. 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

Options

A : V R > V C

B : V C > V R

C : V R = V C

D : V R and V C = 0

9. In Question 6, the capacitor will reach full charge in a time equal to approximately

Options

A : 6 RC

B : 5 RC

C : RC

D : none of the above

10. A 0.47 µF capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is

Options

A : 170 ?

B : 17 ?

C : 0.000169 ?

D : 1.7 ?

1. A capacitor of 0.02 µF is larger than

Options

A : 0.000020 F

B : 200,000 pF

C : 2,000 pF

D : all of the above

2. A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is

Options

A : 3 V

B : 6 V

C : 4 V

D : 0 V

3. A capacitor of 2,000 pF is greater than

Options

A : 0.02 µF

B : 0.002 µF

C : 0.0002 µF

D : 0.0000002 F

4. Voltage leads current by 90° in a capacitor.

Options

A : True

B : False

C :

D :

5. The dielectric constant is the ability of a material to establish an electric field.

Options

A : True

B : False

C :

D :

6. Total parallel capacitance is less than that of the smallest capacitor in parallel.

Options

A : True

B : False

C :

D :

7. The ohm is the unit of capacitance.

Options

A : True

B : False

C :

D :

8. Capacitance is directly proportional to plate area and plate separation.

Options

A : True

B : False

C :

D :

9. A capacitor blocks ac but passes dc.

Options

A : True

B : False

C :

D :

10. The true power in a capacitor is zero.

Options

A : True

B : False

C :

D :

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