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?

None of these
34.4 mA
68.4 mA
24.2 mA
28.4 mA

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Electronic Principles
Which one of the following statements best applies to a parallel RLC circuit?

None of these
All of these
The current waveform for each component always has the same amplitude and phase as the applied current
The voltage waveform for each component always has the same amplitude and phase as the applied voltage
The sum of the current is always less than the applied current

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

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

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Electronic Principles
For a pure capacitor:

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

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