Electronic Principles
A high-pass filter:

passes higher-frequency signals and reduces lower-frequency signals
increases the level of all frequencies by a significant amount
None of these
passes lower-frequency signals and reduces higher-frequency signals
has no effect on ac signals

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Electronic Principles
Which one of the following phrases most accurately describes a purely capacitive circuit?

None of these
Resistances provide the only opposition to current flow
The ac voltage leads the current by 90 degree
Capacitive reactance provides the only opposition to current flow
Combinations of resistance and capacitive reactance provide any opposition to current flow

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

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