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? 300 mA 208 mA None of these 7.8 mA 200 mA 300 mA 208 mA None of these 7.8 mA 200 mA ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The number of free electrons and holes in intrinsic semiconductor increases when the temperature None of these Increases 0oC Decreases Stays the same None of these Increases 0oC Decreases Stays the same ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The core of an electromagnet is said to be in saturation when: None of these an increase in current through the coil causes no further increase in the mmf 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 frequent changes in the direction of current through the coil causes heating effects in the core material None of these an increase in current through the coil causes no further increase in the mmf 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 frequent changes in the direction of current through the coil causes heating effects in the core material ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A basic capacitor is composed of: two coils separated by a conductor two dielectrics separated by a conductor None of these two conductors separated by a dielectric two coils separated by a dielectric two coils separated by a conductor two dielectrics separated by a conductor None of these two conductors separated by a dielectric two coils separated by a dielectric ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles What is the barrier potential of a silicon diode at room temperature? None of these 2 m V per degree Celsius 0.7V 0.3V 1 V None of these 2 m V per degree Celsius 0.7V 0.3V 1 V ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Silicon atoms combine into an orderly pattern called a None of these Valence orbit Covalent bond Semiconductor Crystal None of these Valence orbit Covalent bond Semiconductor Crystal ANSWER DOWNLOAD EXAMIANS APP
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