Electronic Principles
An ideal voltage source has

None of these
A load dependent voltage
A load-dependent current
Zero internal resistance
Infinite internal resistance

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

None of these
an increase in current through the coil causes no further increase in the mmf
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
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
Which one of the following phrases most accurately describes a purely capacitive circuit?

None of these
The ac voltage leads the current by 90 degree
Resistances provide the only opposition to current flow
Capacitive reactance provides the only opposition to current flow
Combinations of resistance and capacitive reactance provide any opposition to current flow

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