Electronic Principles
A real voltage source has

A small internal resistance
A large internal resistance
Infinite internal resistance
None of these
Zero internal resistance

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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
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
The current in an ac circuit flows in one direction, but changes value periodically

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Electronic Principles
The total impedance of a parallel RLC circuit:

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

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