Electronic Principles Which one of the following principles best describes the basic operation of an electromagnet? Current flowing through a conductor generates a magnetic field Like magnetic poles attract, while unlike poles repel Current is induced in a conductor that is moving through a magnetic field Like magnetic poles repel, while unlike poles attract None of these Current flowing through a conductor generates a magnetic field Like magnetic poles attract, while unlike poles repel Current is induced in a conductor that is moving through a magnetic field Like magnetic poles repel, while unlike poles attract None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Doubling the operating frequency of a capacitive circuit: doubles the amount of a capacitive reactance has no effect on the capacitive reactance multiplies the capacitive reactance by 6.28 None of these cuts the capacitive reactance in half doubles the amount of a capacitive reactance has no effect on the capacitive reactance multiplies the capacitive reactance by 6.28 None of these cuts the capacitive reactance in half 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 0.2 A None of these 0.6 A 0.4 A 0.3 A 0.2 A None of these 0.6 A 0.4 A ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles If a load resistance is 1 kW, a stiff voltage source has a resistance of less than 10 Ohm None of these At least 10 Ohm More than 100 k Ohm Less than 100 k Ohm less than 10 Ohm None of these At least 10 Ohm More than 100 k Ohm Less than 100 k Ohm ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles What is the total resistance of a series circuit that contains four resistors having values of 220W, 470W, 1W, and 1.2W? 844.5 Ohm 1234 Ohm 3890 Ohm 692.2 Ohm None of these 844.5 Ohm 1234 Ohm 3890 Ohm 692.2 Ohm None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? Doping Thermal energy None of these Free electrons Valence electrons Doping Thermal energy None of these Free electrons Valence electrons ANSWER DOWNLOAD EXAMIANS APP
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