Electronics - Capacitors

Exercise :: Capacitors - General Questions

51. 

What is the circuit's impedance?

A. 1192
B. 843
C. 723
D. 511

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

52. 

In an ac circuit, a capacitor and an output 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 C

Explanation:

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53. 

What is the impedance of this circuit?

A. 5928
B. 2000
C. 1902
D. 1798

Answer: Option A

Explanation:

Impedance Cannot be Directly Measured, We Need to find Xc first.

So,

Xc = 1/2πfC.

Xc = 1/( 2 x 3.14 x 5000 x 0.01 x 10-6 ).

Xc = 3184.7.

Z = Sqrt( Xc2 + R2 ).

Z = Sqrt( 3184.72 + 50002 ).

Z = 5928 Ω.


54. 

What is the reactive power?

A. 6.8 mW
B. 9.8 mW
C. 12.8 mW
D. 15.8 mW

Answer: Option B

Explanation:

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55. 

A practical capacitor

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

Answer: Option B

Explanation:

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