Electronic Principles
Which one of the following kinds of materials has the lowest permeability?

A diamagnetic material
None of these
All of these
A feiTomagnetic material
A paramagnetic material

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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
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
None of these

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Electronic Principles
A high-pass filter:

passes higher-frequency signals and reduces lower-frequency signals
has no effect on ac signals
None of these
increases the level of all frequencies by a significant amount
passes lower-frequency signals and reduces higher-frequency signals

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Electronic Principles
Which one of the following statements is true for current flowing in a parallel circuit?

The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
The total current in a parallel circuit is always less than the smallest amount of current
The same current always flows through every part of a parallel circuit
The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
None of these

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