Electronic Principles The rise time of a pulse waveform is the time required for the voltage to rise: from 10% of the peak value to 90% of the peak value from 10% of the peak value to 70.7% of the peak value from zero to its peak value from zero to its rms value None of these from 10% of the peak value to 90% of the peak value from 10% of the peak value to 70.7% of the peak value from zero to its peak value from zero to its rms value None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current? None of these 300 mA 208 mA 7.8 mA 200 mA None of these 300 mA 208 mA 7.8 mA 200 mA 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? 0.6 A None of these 0.4 A 0.2 A 0.3 A 0.6 A None of these 0.4 A 0.2 A 0.3 A ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following phrasers best describes flux density? The force that maintains lines of force The opposition to a build-up of magnetic fields None of these The concentration of lines of magnetic force The rate of change of the number of lines of magnetic force The force that maintains lines of force The opposition to a build-up of magnetic fields None of these The concentration of lines of magnetic force The rate of change of the number of lines of magnetic force ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The direction of electron current flow is: from positive to negative None of these from neutral to positive from right to left from negative to positive from positive to negative None of these from neutral to positive from right to left from negative to positive ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The graph of current gain versus collector current indicates that the current gain None of these is contant equals the collector current divided by the base current varies enormously varies slightly None of these is contant equals the collector current divided by the base current varies enormously varies slightly ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS