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1
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
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Answer: Option B
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2
What is the capacitance when Q = 60 µC and V = 12 V?
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Answer: Option B
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3
Voltage leads current by 90° in a capacitor.
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Answer: Option B
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4
Five time constants are required for a capacitor to charge fully or discharge fully.
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Answer: Option A
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5
A capacitor of 2,000 pF is greater than
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Answer: Option C
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6
A capacitor of 0.02 µF is larger than
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Answer: Option C
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7
The true power in a capacitor is zero.
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Answer: Option A
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8
A capacitor blocks A.C. but passes D.C.
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Answer: Option B
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9
Two 0.68 µF capacitors are connected in series across a 10 kHz sine wave signal source. The total capacitive reactance is
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Answer: Option A
Solution:
Capacitive Reactance should be:
$${{\text{X}}_{\text{C}}} = \frac{1}{2}\pi {\text{fC}}$$
Where:
f = frequency
C = Capacitance
For capacitors in series:
$$\eqalign{ & \frac{1}{{\text{C}}} = \frac{1}{{{{\text{C}}_1}}} + \frac{1}{{{{\text{C}}_2}}} \cr & {\text{So,}}\,{\text{C}} = 3.4 \times {10^{ - 7}}{\text{F}} \cr & {\text{So:}} \cr & {{\text{X}}_{\text{C}}} = \frac{1}{{2\pi \cdot 3.4 \times {{10}^{ - 7}} \cdot 10000}} = 46.8\Omega \cr} $$
10
A 0.47 µF capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is
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Answer: Option A
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