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? 24.2 mA 68.4 mA None of these 28.4 mA 34.4 mA 24.2 mA 68.4 mA None of these 28.4 mA 34.4 mA ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current? None of these 0.2 A 0.4 A 0.6 A 0.3 A None of these 0.2 A 0.4 A 0.6 A 0.3 A ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? Thermal energy Valence electrons Doping Free electrons None of these Thermal energy Valence electrons Doping Free electrons 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? None of these 300 mA 7.8 mA 200 mA 208 mA None of these 300 mA 7.8 mA 200 mA 208 mA ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following properties of a magnetic circuit can be directly compared to current in an electrical circuit? None of these Magnetomotive force Number of lines of force Reluctance Flux density None of these Magnetomotive force Number of lines of force Reluctance Flux density ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following devices is most often used for measuring electrical potential difference? Ammeter None of these Wattmeter Voltmeter Ohmmeter Ammeter None of these Wattmeter Voltmeter Ohmmeter ANSWER DOWNLOAD EXAMIANS APP
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