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

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

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

frequent changes in the direction of current through the coil causes heating effects in the core material
the core is permitted to move freely within the coil
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
an increase in current through the coil causes no further increase in the mmf
None of these

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Electronic Principles
Which one of the following statements most accurately describes the nature of inductive reactance?

Inductive reactance is another term for counter emf
Inductive reactance is a force that tends to overcome the effects of counter emf
Inductive reactance is an opposition to current flow in dc circuits
Inductive reactance is an opposition to current flow in ac circuits
None of these

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

None of these
doubles the amount of current through the inductors
has no effect on the current through the inductors
increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
cuts the current through the inductors one-half

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Electronic Principles
The total capacitance of a series capacitor circuit is:

less than the value of the smallest capacitor
equal to the sum of the individual capacitance values
equal to the source voltage divided by total current
None of these
equal to the sun of the individual capacitive-reactance values

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