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Electronics
‣
Capacitors
Comments
Question
What is the phase shift between the voltage across the resistor and the voltage from the source?
Options
A. V
R
leads V
S
by 17°
B. V
R
leads V
S
by 73°
C. V
R
lags V
S
by 73°
D. V
R
lags V
S
by 17°
Correct Answer
V
R
leads V
S
by 73°
Capacitors problems
Search Results
1. If a capacitor is placed across a 20 V source, what will be the amount of charge after 5 tc?
Options
A. 5.0 V
B. 12.8 V
C. 13.5 V
D. 20 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 20 V
2. A practical capacitor
Options
A. is a short to dc
B. looks like a capacitor in parallel with a resistor
C. is an open to ac
D. stores energy in a magnetic field
Show Answer
Scratch Pad
Discuss
Correct Answer: looks like a capacitor in parallel with a resistor
3. What is the value of a capacitor labeled 102?
Options
A. 10,000 pF
B. 1000 pF
C. 1000 µF
D. 10,000 µF
Show Answer
Scratch Pad
Discuss
Correct Answer: 1000 pF
4. As a capacitor is being charged, current flowing into the capacitor will:
Options
A. increase
B. decrease
C. remain the same
D. cannot tell
Show Answer
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Discuss
Correct Answer: decrease
5. An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant?
Options
A. 1 volt
B. 3 volts
C. 5 volts
D. 7 volts
Show Answer
Scratch Pad
Discuss
Correct Answer: 7 volts
6. Which of the following is the reference vector for parallel RC circuits?
Options
A. R
B. I
C. C
D. V
Show Answer
Scratch Pad
Discuss
Correct Answer: V
7. Select the equation below that represents the relationship between charge, capacitance, and voltage for a capacitor.
Options
A. Q = CV
B. C = QV
C.
D. V = IR
Show Answer
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Discuss
Correct Answer: Q = CV
8. What circuit has the following frequency response?
Options
A. bandpass filter
B. high-pass filter
C. low-pass filter
D. integrator
Show Answer
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Discuss
Correct Answer: low-pass filter
9. What is the capacitive reactance if I = 1 amp, V = 2 volts, C = 5 F, and frequency = 10 Hz?
Options
A. 0.2 Ω
B. 0.5 Ω
C. 0.02 Ω
D. 0.003 Ω
Show Answer
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Discuss
Correct Answer: 0.003 Ω
10. What is the range between
f
1
and
f
2
of an
RLC
circuit that resonates at 150 kHz and has a
Q
of 30?
Options
A. 100.0 kHz to 155.0 kHz
B. 147.5 kHz to 152.5 kHz
C. 4500 kHz to 295.5 kHz
D. 149,970 Hz to 150,030 Hz
Show Answer
Scratch Pad
Discuss
Correct Answer: 147.5 kHz to 152.5 kHz
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