Electronic Principles
A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?

400 Ohm
550 Ohm
None of these
310 Ohm
410 Ohm

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Electronic Principles
The total inductance of a series inductor circuit is:

equal to the sum of the individual inductive-reactance values
equal to the source voltage divided by total current
equal to the sum of the individual inductance values
None of these
less than the value of the smallest inductor

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Electronic Principles
Which one of the following statements is true for the impedance of a series RC circuit?

The impedance is equal to the sum of the resistance and capacitive reactance
None of these
The impedance is greater than either the resistance or capacitive reactance but less than their sum
The impedance is greater than the sum of the resistance and capacitive reactance
The impedance is less than the sum of the resistance and capacitive reactance

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Electronic Principles
The total capacitive reactance of a parallel capacitor circuit is:

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

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