Electronic Principles
In an intrinsic semiconductor, the number of free electrons

Equals the number of holes
None of these
Is greater than the number of holes
Impossible to say
Is less than the number of holes

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

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

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Electronic Principles
In a pure inductor:

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

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