Electronic Principles Which one of the following statements most accurately reflects the nature of ac power? The current in an ac circuit flows in two directions at the same time The current in an ac circuit changes direction periodically None of these The current in an ac circuit flows in one direction, but changes value periodically The current in an ac circuit flows in one direction at a steady level The current in an ac circuit flows in two directions at the same time The current in an ac circuit changes direction periodically None of these The current in an ac circuit flows in one direction, but changes value periodically The current in an ac circuit flows in one direction at a steady level ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The core of an electromagnet is said to be in saturation when: changing the polarity of the current in the coil changes the polarity of the magnetic field around the core an increase in current through the coil causes no further increase in the mmf the core is permitted to move freely within the coil None of these frequent changes in the direction of current through the coil causes heating effects in the core material changing the polarity of the current in the coil changes the polarity of the magnetic field around the core an increase in current through the coil causes no further increase in the mmf the core is permitted to move freely within the coil None of these frequent changes in the direction of current through the coil causes heating effects in the core material ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Positive ions are atoms that have Lost a proton Lost an electron Gained a proton Gained an electron None of these Lost a proton Lost an electron Gained a proton Gained an electron None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following principles best describes the basic operation of a generator? Current flowing through a conductor generates a magnetic field Like magnetic poles repel; unlike poles attract Like magnetic poles attract; unlike poles repel Current is induced in a conductor that is moving through a magnetic field None of these Current flowing through a conductor generates a magnetic field Like magnetic poles repel; unlike poles attract Like magnetic poles attract; unlike poles repel Current is induced in a conductor that is moving through a magnetic field None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following statements regarding ac circuits is correct? Current lags the voltage through a resistor All of these Current leads the voltage through a resistor Current and voltages are in phase through a resistor None of these Current lags the voltage through a resistor All of these Current leads the voltage through a resistor Current and voltages are in phase through a resistor None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A real voltage source has None of these Infinite internal resistance A large internal resistance Zero internal resistance A small internal resistance None of these Infinite internal resistance A large internal resistance Zero internal resistance A small internal resistance ANSWER DOWNLOAD EXAMIANS APP
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