Electronic Principles
The graph of current gain versus collector current indicates that the current gain

varies slightly
equals the collector current divided by the base current
varies enormously
None of these
is contant

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

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