ECET 299 Active Devices Practice 1(Latest Version) Questions with Answers

Grading Summary 1. Question : (TCO 2) The majority carriers in an n­type semiconductor are Student Answer: negative ions. (Charge is carried by electrons (n­type) or holes (p­type) in semiconductors.) positive ions. (Charge is carried by electrons (n­type) or holes (p­type) in semiconductors.) electrons. (Electrons are the charge carries for p­type semiconductors.) holes. (This is correct. Electrons carry charge in n­type semiconductors.) Instructor Explanation: An n­type semiconductor is formed by introducing impurities with five valence electrons into a silicon base. Because silicon has four covalent bonds, this creates a surplus of electrons. See Boylestad and Nashelsky, Chapter 1.5. Points Received: Comments: 1 of 1 2. Question : (TCO 2) A forward­biased diode Student Answer: conducts current. (This is correct; the diode is “on” so current flow is enabled.) blocks current. (This is the condition for a reverse­bias diode.) rectifies current. (Only partially correct, because when an AC signal is applied, the diode is alternately conducting and blocking current flow.) amplifies. (The diode provides no amplification.) Instructor Explanation: The condition of a forward bias describes turning a diode on to allow current flow. In the reverse bias condition, no current flows. See Boylestad and Nashelsky, Chapter 1.5. Points Received: Comments: 0 of 1