Electronic Principles
A farad is defined as the amount of capacitance necessary for:

dissipating 1 W of power
storing 1 V for 1 second
causing an ac phase shift greater than 90 degree
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
None of these

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Electronic Principles
Current is

The number of free electrons in an atom
None of these
An imbalance of electrical charges
The force that causes electrons to flow
The flow of charged particles through a material

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Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and frequency on the horizontal axis
the passage of time on the vertical axis and amplitude on the horizontal axis
amplitude on the vertical axis and the passage of time on the horizontal axis
frequency on the vertical axis and amplitude on the horizontal axis
None of these

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

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

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