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? 200 mA 7.8 mA 300 mA None of these 208 mA 200 mA 7.8 mA 300 mA None of these 208 mA ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage? 208 V 651 V 700 V 707 V None of these 208 V 651 V 700 V 707 V None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following statements regarding ac circuits is correct? Current leads the voltage through a resistor None of these Current and voltages are in phase through a resistor All of these Current lags the voltage through a resistor Current leads the voltage through a resistor None of these Current and voltages are in phase through a resistor All of these Current lags the voltage through a resistor ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles What is the power dissipation of a resistance that has 24 V dropped across it and 0.25 A flowing through it? 3 W 6 W 64 W None of these 122 W 3 W 6 W 64 W None of these 122 W ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff? 6 Ohm None of these 5 Ohm 50 Ohm or more 100 Ohm 6 Ohm None of these 5 Ohm 50 Ohm or more 100 Ohm ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Current and voltage are said to be in phase when: their waveforms cross through zero and reach positive and negative peaks at the same time they have the same amplitude and frequency their waveforms are both ac or both dc None of these All of these their waveforms cross through zero and reach positive and negative peaks at the same time they have the same amplitude and frequency their waveforms are both ac or both dc None of these All of these ANSWER DOWNLOAD EXAMIANS APP
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