Electronic Principles
Which one of the following principles best describes the basic operation of an electromagnet?

Like magnetic poles attract, while unlike poles repel
Like magnetic poles repel, while unlike poles attract
None of these
Current is induced in a conductor that is moving through a magnetic field
Current flowing through a conductor generates a magnetic field

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

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Electronic Principles
When a series RLC circuit is operating at its resonant frequency:

None of these
the difference between inductive and capacitive reactance is equal to the resistance
inductive reactance is equal to the capacitive reactance
capacitive reactance is greater than the inductive reactance
inductive reactance is greater than the capacitive reactance

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