Electronic Principles
Current can flow through a normally open push button switch as long as:

its contact remain open
you are not pressing the button
its contact remain open
you are pressing the button
None of these

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Electronic Principles
Which one of the following phrasers best describes flux density?

The opposition to a build-up of magnetic fields
The rate of change of the number of lines of magnetic force
None of these
The force that maintains lines of force
The concentration of lines of magnetic force

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Electronic Principles
In a pure inductor:

ac current leads the voltage by 90 degree
None of these
ac current lags the voltage by 90 degree
ac current and voltage are exactly in phase
ac current is converted to dc voltage

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