Electronic Principles
What are the main parts of an atom?

None of these
Protons only
Electrons, protons, and ions
Electrons, ions, and neutrons
Electrons, protons, and neutrons

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

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

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

The voltage always has the same amplitude and phase for every part of the circuit
The total voltage is equal to the sum of the voltages across the resistance and inductance
The total voltages is less than the sum of the voltages across the resistance and inductance
None of these
The total voltage lags the total current by less than 90

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Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

Resistances provide the only opposition to current flow
None of these
Inductive reactance provides the only opposition to current flow
The ac voltage lags the current by 90 degree
Combinations of resistance and inductive reactance provide any opposition to current flow

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