Electronic Principles
The rise time of a pulse waveform is the time required for the voltage to rise:

None of these
from 10% of the peak value to 70.7% of the peak value
from zero to its rms value
from 10% of the peak value to 90% of the peak value
from zero to its peak value

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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
None of these
The concentration of lines of magnetic force
The rate of change of the number of lines of magnetic force
The force that maintains lines of force

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Electronic Principles
What is a free electron?

An electron that has no electrical charge
An electron that costs nothing
None of these
An electron that has been freed from its parent atom
An electron that has twice the amount of charge of a normal electron

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