Electronic Principles A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage? 18 V 24 V None of these 12 V 30 V 18 V 24 V None of these 12 V 30 V ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns? 100 A 0.41666666666667 None of these 0.1 A 1000 A 100 A 0.41666666666667 None of these 0.1 A 1000 A ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles What form of energy is used to maintain an imbalance of charges between the terminals of a battery? Mechanical energy None of these Electronical energy Solar energy Chemical energy Mechanical energy None of these Electronical energy Solar energy Chemical energy ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? Free electrons Doping Thermal energy Valence electrons None of these Free electrons Doping Thermal energy Valence electrons None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles For a pure capacitor: ac current leads the voltage by 90 degree ac current and voltage are exactly in phase None of these ac current lags the voltage by 90 degree ac current is converted to dc voltage ac current leads the voltage by 90 degree ac current and voltage are exactly in phase None of these ac current lags the voltage by 90 degree ac current is converted to dc voltage ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The rotating coil of wire in an electric motor is called the: brush commutator armature loop None of these brush commutator armature loop None of these ANSWER DOWNLOAD EXAMIANS APP
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