Electronic Principles Which one of the following phrases best describes residual magnetism? The amount of magnetic flux that is not confined to the core material of an electromagnet The circular magnetic field that surrounds a conductor carrying a current None of these Magnetism that remains in the core of an electromagnet after the current through the coil is turned off The force of attraction between the poles of a permanent and temporary magnetic field The amount of magnetic flux that is not confined to the core material of an electromagnet The circular magnetic field that surrounds a conductor carrying a current None of these Magnetism that remains in the core of an electromagnet after the current through the coil is turned off The force of attraction between the poles of a permanent and temporary magnetic field 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 3 43891 2 None of these 43922 3 43891 2 None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91? 1000 W 20 W None of these 100 W 200 W 1000 W 20 W None of these 100 W 200 W 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 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 an increase in current through the coil causes no further increase in the mmf changing the polarity of the current in the coil changes the polarity of the magnetic field around the core 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 an increase in current through the coil causes no further increase in the mmf ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The total impedance of a parallel RLC circuit: is equal to the sum of the values of resistance, inductive reactance and capacitive reactance None of these always decreases as the applied frequency increases always increases as the applied frequency increases is maximum at the resonant frequency is equal to the sum of the values of resistance, inductive reactance and capacitive reactance None of these always decreases as the applied frequency increases always increases as the applied frequency increases is maximum at the resonant frequency 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 in a parallel circuit is equal to the average value of the individual resistances None of these The total resistance is equal to the sum of the individual resistances in a parallel circuit. 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 in a parallel circuit is equal to the average value of the individual resistances None of these The total resistance is equal to the sum of the individual resistances in a parallel circuit. The total resistance of a parallel circuit is always less than the value of the smallest resistance ANSWER DOWNLOAD EXAMIANS APP
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