Electronics - Capacitors

Exercise :: Capacitors - General Questions

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: 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: 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: 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: 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: Option D

Explanation:

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