Electronic Principles
The core of an electromagnet is said to be in saturation when:

the core is permitted to move freely within the coil
frequent changes in the direction of current through the coil causes heating effects in the core material
None of these
an increase in current through the coil causes no further increase in the mmf
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core

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Electronic Principles
The total capacitance of a series capacitor circuit is:

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

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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 two directions at the same time
The current in an ac circuit flows in one direction at a steady level
The current in an ac circuit flows in one direction, but changes value periodically

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