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Which of the following statement is inco...

Which of the following statement is incorrect about AC circuit?

A

For resonance the the presence of both L and C elements in the circuit is must in LCR series circuit

B

The power factor in LCR series circuit is a measure of how close the circuit is to expanding the maximum power

C

The quality factor is the measure of the sharpness of resonance in series RLC circuit

D

In a step up transformer voltage changes from low to high and the current is increased by the same proportion

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