21.
If a current of 40 mA flows through a series circuit consisting of a 0.4 F capacitor and a resistor in series with a 4 kHz, 40 Vac source, what is the total circuit impedance?
A. 10 omega.gif
B. 100 omega.gif
C. 1 k omega.gif
D. 1 M omega.gif
Answer & Explanation
Answer: Option C
Explanation:
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22.
What is the capacitance of the circuit shown in the given circuit?
A. 0.066 mu.gifF
B. 0.9 mu.gifF
C. 65.97 pF
D. 900 pF
Answer & Explanation
Answer: Option A
Explanation:
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23.
In an ac circuit, an output capacitor and a resistor are connected in series with an ac signal. What filter action will be the result?
A. bandpass B. low-pass
C. high-pass D. band-stop
Answer & Explanation
Answer: Option B
Explanation:
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24.
What is the total opposition to current in a series RC circuit called?
A. impedance B. inductance
C. reactance D. resistance
Answer & Explanation
Answer: Option A
Explanation:
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25.
Which of the following statements is true?
A. The voltage to which a capacitor is charged can change instantaneously.
B. The current in a capacitive circuit takes time to change.
C. A fully charged capacitor appears as a short to dc current.
D. An uncharged capacitor appears as a short to an instantaneous change in current.
Answer & Explanation
Answer: Option D
Explanation:
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