Electronic Principles
Which one of the following statements most accurately reflects the nature of ac power?

The current in an ac circuit flows in two directions at the same time
The current in an ac circuit flows in one direction, but changes value periodically
None of these
The current in an ac circuit flows in one direction at a steady level
The current in an ac circuit changes direction periodically

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Electronic Principles
The total impedance of a parallel RLC circuit:

always decreases as the applied frequency increases
is maximum at the resonant frequency
None of these
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
always increases as the applied frequency increases

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Electronic Principles
The total capacitive reactance of a parallel capacitor circuit is:

None of these
equal to the source voltage divided by total current
equal to the sum of the individual capacitance values
less than the capacitance value of the smallest capacitor
equal to the sum of the individual capacitive-reactance values

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