Capacitors and Capacitance – Exercise – 1

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

(a)   170 Ω
(b)   17 Ω
(c)   0.000169 Ω
(d)   1.7 Ω

Answer
Answer : (a)
Explanation
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27. A 220 Ω resistor is in series with a 2.2 μF capacitor. The time constant is ________.

(a)   48 μs
(b)   480 μs
(c)   2.42 μs
(d)   24 μs

Answer
Answer : (b)
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28. A 4.7 MΩ 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?

(a)   28 ms
(b)   282 ms
(c)   3.5 s
(d)   70.5 ms

Answer
Answer : (b)
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29. Two series capacitors (one 2 μF, the other of unknown value) are charged from a 24 V source. The 2 μF capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor is ________.

(a)   1 μF
(b)   2 μF
(c)   4 μF
(d)   8 μF

Answer
Answer : (c)
Explanation
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30. A 0.00022 F capacitor equals how many microfarads?

(a)   22 μF
(b)   220 μF
(c)   2,200 μF
(d)   22,200 μF

Answer
Answer : (b)
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