Electronic Principles What is the smallest number of polarities required for current flow? Three - negative, positive and neutral terminals None of these Two - a negative terminal and a positive terminal One - a negative terminal Four - two negative and two positive Three - negative, positive and neutral terminals None of these Two - a negative terminal and a positive terminal One - a negative terminal Four - two negative and two positive ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding? 43922 2 43891 3 None of these 43922 2 43891 3 None of these 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? 0.1 A None of these 1000 A 0.41666666666667 100 A 0.1 A None of these 1000 A 0.41666666666667 100 A ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs? I = P/E P = E2/R P = IE None of these P = I2R I = P/E P = E2/R P = IE None of these P = I2R ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles An audio transformer has a turn ratio of 9, What is its impedance ratio? 9 81 6 None of these 85 9 81 6 None of these 85 ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? Free electrons None of these Valence electrons Thermal energy Doping Free electrons None of these Valence electrons Thermal energy Doping ANSWER DOWNLOAD EXAMIANS APP
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