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Chapter 16

Multiple Choice

Multiple Choice

This activity contains 13 questions.

	Electrons in the outermost orbit or shell of an atom are called   free electrons negative ions valence electrons conduction band electrons

	At any given time in an intrinsic piece of semiconductor material at room temperature   electrons drift randomly recombination occurs holes are created All of the above

	The conduction band is closest to the valence band in   semiconductors conductors insulators The distance is the same for all of the above.

	The area at the junction of p-type and n-type materials that has lost its majority carriers is called the   barrier potential depletion region n region p region

	A pn junction allows current flow when   the p-type material is more positive than the n-type material the n-type material is more positive than the p-type material both the n-type and p-type materials have the same potential there is no potential on the n-type or p-type materials

	The voltage where current may start to flow in a reverse-biased pn junction is called the   breakdown voltage barrier potential forward voltage biasing voltage

	When a diode is forward biased, the voltage across it   is directly proportional to the current is inversely proportional to the current is directly proportional to the source voltage remains approximately the same

	The arrow in the schematic symbol of a diode points to   the n-type material, which is called the anode the n-type material, which is called the cathode the p-type material, which is called the anode the p-type material, which is called the cathode

	The characteristic curve for the complex model of a silicon diode shows that   the barrier potential is 0 V the barrier potential stays fixed at 0.7 V the barrier potential increases slightly with an increase in current the barrier potential decreases slightly with an increase in current

	Testing a good diode with an ohmmeter should indicate   high resistance when forward or reverse biased low resistance when forward or reverse biased high resistance when reverse biased and low resistance when forward biased high resistance when forward biased and low resistance when reverse biased

	If the frequency of the applied ac signal to a half-wave rectifier is 60 Hz, the frequency of the pulsating dc output will be   30 pps 60 pps 90 pps 120 pps

	Which of the following circuits would require the least amount of filtering?   A half-wave rectifier A full-wave rectifier A bridge rectifier A full-wave rectifier and a bridge rectifier

	A diode for which you can change the reverse bias, and thus vary the capacitance is called a   varactor diode tunnel diode zener diode switching diode

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