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? None of these 400 Ohm 310 Ohm 410 Ohm 550 Ohm None of these 400 Ohm 310 Ohm 410 Ohm 550 Ohm ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz? 628 Ohm None of these 444 Ohm Less than 1 Ohm 100 Ohm 628 Ohm None of these 444 Ohm Less than 1 Ohm 100 Ohm ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current? 3.75 mA 3.2 mA 13 mA 0.05 mA None of these 3.75 mA 3.2 mA 13 mA 0.05 mA None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The merging of a free electron and a hole is called Lifetime Covalent bonding Recombination Thermal energy None of these Lifetime Covalent bonding Recombination Thermal energy None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following statements most accurately applies to the frequency of a waveform? The longer the period of a waveform, the lower its frequency None of these The actual frequency of a sine waveform is 1.41 times the working frequency The higher the amplitude of a waveform, the higher its frequency Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz The longer the period of a waveform, the lower its frequency None of these The actual frequency of a sine waveform is 1.41 times the working frequency The higher the amplitude of a waveform, the higher its frequency Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following statements is true for the voltages in a series RL circuit? The total voltages is equal to the sum of the voltages across the resistance and inductance None of these The total voltage lags the total current by less than 90 The total voltage is less than the sum of the voltages across the resistance and inductance The voltage always has the same amplitude and phase for every part of the circuit The total voltages is equal to the sum of the voltages across the resistance and inductance None of these The total voltage lags the total current by less than 90 The total voltage is less than the sum of the voltages across the resistance and inductance The voltage always has the same amplitude and phase for every part of the circuit ANSWER DOWNLOAD EXAMIANS APP
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