Electronic Principles Which one of the following principles best describes the basic operation of an electromagnet? Like magnetic poles repel, while unlike poles attract 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 attract, while unlike poles repel Like magnetic poles repel, while unlike poles attract 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 attract, while unlike poles repel ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Current and voltage are said to be in phase when: they have the same amplitude and frequency their waveforms are both ac or both dc All of these their waveforms cross through zero and reach positive and negative peaks at the same time None of these they have the same amplitude and frequency their waveforms are both ac or both dc All of these their waveforms cross through zero and reach positive and negative peaks at the same time None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have? 400 Ohm 550 Ohm 410 Ohm 310 Ohm None of these 400 Ohm 550 Ohm 410 Ohm 310 Ohm None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following phrases most accurately describes a purely inductive circuit? Combinations of resistance and inductive reactance provide any opposition to current flow Inductive reactance provides the only opposition to current flow None of these The ac voltage lags the current by 90 degree Resistances provide the only opposition to current flow Combinations of resistance and inductive reactance provide any opposition to current flow Inductive reactance provides the only opposition to current flow None of these The ac voltage lags the current by 90 degree Resistances provide the only opposition to current flow ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following statements is true for resistance in a parallel circuit? The total resistance of a parallel circuit is equal to the total voltage The total resistance is equal to the sum of the individual resistances in a parallel circuit. None of these The total resistance in a parallel circuit is equal to the average value of the individual resistances The total resistance of a parallel circuit is always less than the value of the smallest resistance The total resistance of a parallel circuit is equal to the total voltage The total resistance is equal to the sum of the individual resistances in a parallel circuit. None of these The total resistance in a parallel circuit is equal to the average value of the individual resistances The total resistance of a parallel circuit is always less than the value of the smallest resistance ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following is a direct statement of Ohm's law? The algebraic sum of currents entering and leaving a point is equal to zero The algebraic sum of voltages in a loop is equal to zero The total resistance of a parallel circuit is less than the value of the smallest resistance The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it None of these The algebraic sum of currents entering and leaving a point is equal to zero The algebraic sum of voltages in a loop is equal to zero The total resistance of a parallel circuit is less than the value of the smallest resistance The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it None of these ANSWER DOWNLOAD EXAMIANS APP
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