Electronic Principles Doubling the number of turns of wire in an inductor: multiplies the value of inductance by four reduces the value of inductance by one-fourth None of these reduces the value of inductance by one-half multiplies the value of inductance by two multiplies the value of inductance by four reduces the value of inductance by one-fourth None of these reduces the value of inductance by one-half multiplies the value of inductance by two 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 rate of change of the number of lines of magnetic force The concentration 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 rate of change of the number of lines of magnetic force The concentration of lines of magnetic force 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? 3.2 mA 3.75 mA 0.05 mA 13 mA None of these 3.2 mA 3.75 mA 0.05 mA 13 mA None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating? None of these I = P/E R = E2/P P = PR P = E2/R None of these I = P/E R = E2/P P = PR P = E2/R ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The period of a waveform is: the time required to complete one full cycle equal to 0.707 times the peak amplitude the number of cycles completed in one second None of these the time required for the voltage to rise from 10% to 90% of the peak amplitude the time required to complete one full cycle equal to 0.707 times the peak amplitude the number of cycles completed in one second None of these the time required for the voltage to rise from 10% to 90% of the peak amplitude ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio? 4 None of these 0.5 180 0.25 4 None of these 0.5 180 0.25 ANSWER DOWNLOAD EXAMIANS APP
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