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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 / v.
 C dv / dt.
 Cv.

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Electric Circuits
For a band pass filter, cut off frequency of the low pass filter should be ___ of the high pass filter?

All of these
 greater than
 equals to
 less than

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Electric Circuits
Voltage magnification will occur in which of the following case?

None of these
 Both
 Parallel resonance
 Series resonance

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Electric Circuits
For ideal tank circuit what is the value of dynamic impedance?

 Both
 ∞
 0
None of these

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Electric Circuits
A current is said to be alternating when it changes in

 magnitude.
 none of these.
 direction.
 both ‘a’ and ‘b’.

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Electric Circuits
i) In star connection line current is equal to phase current. ii) In delta connection line voltage is equal to phase voltage. For a given phase connected to the particular line which of the statement is true ?

 None of these.
 Only (1).
 Only (2).
 Both (1) and (2).

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