Electronic Principles What is the smallest number of polarities required for current flow? Three - negative, positive and neutral terminals Four - two negative and two positive One - a negative terminal Two - a negative terminal and a positive terminal None of these Three - negative, positive and neutral terminals Four - two negative and two positive One - a negative terminal Two - a negative terminal and a positive terminal None of these 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 frequent changes in the direction of current through the coil causes heating effects in the core material None of these an increase in current through the coil causes no further increase in the mmf the core is permitted to move freely within the coil changing the polarity of the current in the coil changes the polarity of the magnetic field around the core frequent changes in the direction of current through the coil causes heating effects in the core material None of these an increase in current through the coil causes no further increase in the mmf the core is permitted to move freely within the coil ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles When applying a square waveform to a capacitor, the circuit tends to: peak the current and round off the voltage waveforms peak the voltage and round off the current waveforms peak both the voltage and current waveforms round off both the voltage and current waveforms None of these peak the current and round off the voltage waveforms peak the voltage and round off the current waveforms peak both the voltage and current waveforms round off both the voltage and current waveforms None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current? 10.3 µA 14.8 µA None of these 7.75 µA 7.8 µA 10.3 µA 14.8 µA None of these 7.75 µA 7.8 µA ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following equations most directly determines the power dissipation of a resistance when you know the power dissipation of a resistance when you know the voltage drop and current? P = I2R P = E2/R None of these P = IE I = P/E P = I2R P = E2/R None of these P = IE I = P/E ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The total capacitance of a series capacitor circuit is: equal to the source voltage divided by total current less than the value of the smallest capacitor equal to the sun of the individual capacitive-reactance values equal to the sum of the individual capacitance values None of these equal to the source voltage divided by total current less than the value of the smallest capacitor equal to the sun of the individual capacitive-reactance values equal to the sum of the individual capacitance values None of these ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS