Electronic Principles
An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

68.4 mA
34.4 mA
24.2 mA
28.4 mA
None of these

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Electronic Principles
A low-pass filter:

passes lower-frequency signals and reduces higher-frequency signals
has no effect on ac signals
reduces the level of all frequencies by a significant amount
passes higher-frequency signals and reduces lower-frequency signals
None of these

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Electronic Principles
What is a negative ion?

An atom that contains more protons than electrons
None of these
An atom that contains more electrons than protons
An atom that contains more protons than neutrons
An atom that contains more electrons than neutrons

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Electronic Principles
Which one of the following is a statement of KirchhofFs voltage law?

None of these
The total voltage in a parallel circuit is less than the value of the smallest voltage
The algebraic sum of voltages entering and leaving a point is equal to zero
The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
The algebraic sum of voltages in a loop is equal to zero

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