Electronic Principles
Which one of the following phrases best describes residual magnetism?

The force of attraction between the poles of a permanent and temporary magnetic field
The circular magnetic field that surrounds a conductor carrying a current
The amount of magnetic flux that is not confined to the core material of an electromagnet
None of these
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off

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Electronic Principles
Molecule is

None of these
A atom that has an excessive number of electrons in its outer orbit
A atom that has a shortage of electrons in its outer orbit
The smallest particle of a substance that retains the properties of that substance
A atom that flows whenever there is an imbalance of electrical charges between two points

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Electronic Principles
The period of a waveform is:

None of these
the number of cycles completed in one second
the time required for the voltage to rise from 10% to 90% of the peak amplitude
the time required to complete one full cycle
equal to 0.707 times the peak amplitude

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Electronic Principles
What is a free electron?

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

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

The total resistance in a parallel circuit is equal to the average value of the individual resistances
The total resistance of a parallel circuit is equal to the total voltage
The total resistance of a parallel circuit is always less than the value of the smallest resistance
None of these
The total resistance is equal to the sum of the individual resistances in a parallel circuit.

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