Electronic Principles An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? Thermal energy Free electrons Doping Valence electrons None of these Thermal energy Free electrons Doping Valence electrons None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles In a step-down transformer, which is larger? Primary voltage Secondary voltage Impossible to say Neither None of these Primary voltage Secondary voltage Impossible to say Neither None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The direction of electron current flow is: None of these from neutral to positive from right to left from positive to negative from negative to positive None of these from neutral to positive from right to left from positive to negative from negative to positive 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? 0.3 A 0.6 A None of these 0.2 A 0.4 A 0.3 A 0.6 A None of these 0.2 A 0.4 A ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage? 12 V 30 V 18 V 24 V None of these 12 V 30 V 18 V 24 V None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The north pole of a magnet is the one: that would be repelled by the south pole of another magnet None of these that would be attracted to the earth's south magnetic pole that would be attracted to the earth's north magnetic pole that has its molecules arranged in a random pattern that would be repelled by the south pole of another magnet None of these that would be attracted to the earth's south magnetic pole that would be attracted to the earth's north magnetic pole that has its molecules arranged in a random pattern ANSWER DOWNLOAD EXAMIANS APP
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