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

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

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Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage remains at one polarity but changes value periodically
The voltage causes current to flow in two directions at the same time
None of these
The voltage remains at one polarity and at a steady level
The voltage reverses polarity periodically

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

The total current in a series circuit is equal to the total voltage multiplied by the total resistance
None of these
The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it
The same current flows through every part of a series circuit
The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit

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Electronic Principles
In a pure inductor:

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

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