Electronic Principles An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? Free electrons Doping Valence electrons None of these Thermal energy Free electrons Doping Valence electrons None of these Thermal energy 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 None of these peak the voltage and round off the current waveforms peak both the voltage and current waveforms round off both the voltage and current waveforms peak the current and round off the voltage waveforms None of these peak the voltage and round off the current waveforms peak both the voltage and current waveforms round off both the voltage and current waveforms ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A high-pass filter: has no effect on ac signals increases the level of all frequencies by a significant amount passes lower-frequency signals and reduces higher-frequency signals None of these passes higher-frequency signals and reduces lower-frequency signals has no effect on ac signals increases the level of all frequencies by a significant amount passes lower-frequency signals and reduces higher-frequency signals None of these passes higher-frequency signals and reduces lower-frequency signals ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The merging of a free electron and a hole is called None of these Thermal energy Covalent bonding Recombination Lifetime None of these Thermal energy Covalent bonding Recombination Lifetime ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following statements best describes magnetic hysteresis? Hysteresis is most apparent when the core material is saturated Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet None of these Hysteresis is most apparent when the core material is saturated Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The core of an electromagnet is said to be in saturation when: an increase in current through the coil causes no further increase in the mmf None of these 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 the core is permitted to move freely within the coil an increase in current through the coil causes no further increase in the mmf None of these 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 the core is permitted to move freely within the coil ANSWER DOWNLOAD EXAMIANS APP
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