Electronic Principles Current and voltage are said to be in phase when: they have the same amplitude and frequency their waveforms cross through zero and reach positive and negative peaks at the same time their waveforms are both ac or both dc All of these None of these they have the same amplitude and frequency their waveforms cross through zero and reach positive and negative peaks at the same time their waveforms are both ac or both dc All of these None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current? 208 mA 200 mA 7.8 mA None of these 300 mA 208 mA 200 mA 7.8 mA None of these 300 mA ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The total inductive reactance of a parallel inductor circuit is: equal to the source voltage divided by total current equal to the sum of the individual inductance values equal to the sum of the individual inductive-reactance values None of these less than the inductance value of the smallest inductor equal to the source voltage divided by total current equal to the sum of the individual inductance values equal to the sum of the individual inductive-reactance values None of these less than the inductance value of the smallest inductor ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA? 18.8 V None of these 10.17 V 20 V 0.17 V 18.8 V None of these 10.17 V 20 V 0.17 V ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Doubling the operating frequency of a capacitive circuit: multiplies the capacitive reactance by 6.28 doubles the amount of a capacitive reactance None of these cuts the capacitive reactance in half has no effect on the capacitive reactance multiplies the capacitive reactance by 6.28 doubles the amount of a capacitive reactance None of these cuts the capacitive reactance in half has no effect on the capacitive reactance ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Doubling the operating frequency of a purely inductive circuit: doubles the amount of current through the inductors None of these cuts the current through the inductors one-half increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit has no effect on the current through the inductors doubles the amount of current through the inductors None of these cuts the current through the inductors one-half increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit has no effect on the current through the inductors ANSWER DOWNLOAD EXAMIANS APP
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