Electronic Principles What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz? Less than 1 Ohm 444 Ohm 100 Ohm None of these 628 Ohm Less than 1 Ohm 444 Ohm 100 Ohm None of these 628 Ohm 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? 18 V 12 V 30 V None of these 24 V 18 V 12 V 30 V None of these 24 V ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The number of free electrons and holes in intrinsic semiconductor increases when the temperature 0oC Increases None of these Decreases Stays the same 0oC Increases None of these Decreases Stays the same 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? Reluctance None of these Flux density Magnetomotive force Number of lines of force Reluctance None of these Flux density Magnetomotive force Number of lines of force ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles What is the smallest number of polarities required for current flow? One - a negative terminal Three - negative, positive and neutral terminals Two - a negative terminal and a positive terminal Four - two negative and two positive None of these One - a negative terminal Three - negative, positive and neutral terminals Two - a negative terminal and a positive terminal Four - two negative and two positive None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following principles best describes the basic operation of an electromagnet? Current is induced in a conductor that is moving through a magnetic field Like magnetic poles repel, while unlike poles attract Current flowing through a conductor generates a magnetic field Like magnetic poles attract, while unlike poles repel None of these Current is induced in a conductor that is moving through a magnetic field Like magnetic poles repel, while unlike poles attract Current flowing through a conductor generates a magnetic field Like magnetic poles attract, while unlike poles repel None of these ANSWER DOWNLOAD EXAMIANS APP
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