ECEN3913 Quiz 2: Properties of Semiconductors and Electromechanical Devices - Prof. Jerzy , Quizzes of Electrical and Electronics Engineering

Download ECEN3913 Quiz 2: Properties of Semiconductors and Electromechanical Devices - Prof. Jerzy and more Quizzes Electrical and Electronics Engineering in PDF only on Docsity! Quiz #2 ECEN3913 January 17, 2007 Name………………………………………………. 1) A crystal is a metal ( mark all true answers) ( ) if the temperature is high enough so the gap energy is much less than kT ( ) if the number of all electrons in the crystal is much greater than that for an insulator ( ) if the conduction band and the valence band overlap 2) A semiconductor is commonly called an insulator ( mark all true answers) ( ) if the gap energy is similar to kT ( ) if the gap energy is much greater than kT ( ) if the gap energy is negative ( ) if the gap energy is much less than kT 3) Plot relative positions of valence and conduction bands for metal, semiconductor and isolator. 4) Describe construction, operation and applications of pyroelectric detectors. 5) Describe construction, operation, properties, plot │Z│ vs frequency curve for the piezoelectric resonator. Describe their applications. What is the highest achievable frequency stability df/f of quartz oscillators?