15 2-37.   Which class of amplifier has the highest fidelity and lowest efficiency? 1.  A 2.  B 3.  C 4.  AB 2-38.   Which class of amplifier has the highest efficiency? 1.  A 2.  B 3.  C 4.  AB 2-39.   What are the three transistor configurations? 1.  Common base, common grid, and common output 2.  Common anode, common collector, and common base 3.  Common emitter, common base, and common collector 4.  Common emitter, common base, and common base THIS SPACE LEFT BLANK INTENTIONALLY. _______________________________________ IN ANSWERING QUESTIONS 2-40 THROUGH 2-45, MATCH THE TRANSISTOR CONFIGURATIONS LISTED IN COLUMN B TO THE TRANSISTOR CIRCUITS SHOWN IN COLUMN A. (NOTE: ANSWERS IN COLUMN B MAY BE USED MORE THAN ONCE.)               A.  CIRCUITS B. CONFIGURATIONS 2-40. 1. 2. 3. Common Emitter Common Base Common Collector 2-41. 2-42. 2-43. 2-44. 2-45. _______________________________________