Electronic Principles
If a load resistance is 1 kW, a stiff current source has a resistance of

None of these
At least 10 Ohm
Less than 10 Ohm
More than 100 k Ohm
Less than 100 k Ohm

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Electronic Principles
The north pole of a magnet is the one:

that would be repelled by the south pole of another magnet
that has its molecules arranged in a random pattern
that would be attracted to the earth's north magnetic pole
that would be attracted to the earth's south magnetic pole
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 an opposition to current flow in ac circuits
Inductive reactance is a force that tends to overcome the effects of counter emf
None of these
Inductive reactance is another term for counter emf
Inductive reactance is an opposition to current flow in dc circuits

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

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

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