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Electric Circuits

Electric Circuits
Which of the followings is the expression for energy stored in a capacitor?

 (1 / 2) Cv2.
 C dv / dt.
 Cv.
 C / v.

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Electric Circuits
In steady state condition capacitor acts as a

 short circuit
 open circuit
 current source
 voltage source

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Electric Circuits
A balanced three Phase Y-connected load has one phase voltage VB = 277∠45o V. The phase sequence is RYB. The line to line voltage VRY is

 480∠45o V.
 339∠- 45o V.
 480∠ - 45o V.
 339∠45o V.

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Electric Circuits
Capacitor does not allow the sudden change of

None of these
 voltage
 current
 power

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Electric Circuits
The inductive reactance of an electric circuit is 200 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 200 Ohms.
 50 Ohms.
 100 Ohms.
 400 Ohms.

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Electric Circuits
Super position theorem is not applicable for

None of these
 voltage calculations.
 current calculations.
 power calculations.

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