ANSWERS TO QUESTIONS Q1. THROUGH Q46.

1-75 A-26. An energy converter that changes sound energy into electrical energy. A-27. The changing resistance of carbon granules as pressure is applied to them. A-28. Background hiss resulting from random changes in the resistance between individual carbon granules. A-29. The piezoelectric effect. A-30. A dynamic microphone has a moving coil and the magnetic microphone has a moving armature. A-31. Rf and af units. A-32. 100 kilohertz, 5 kilohertz, 95 kilohertz, and 105 kilohertz. A-33. All of the sum frequencies above the carrier. A-34. The intelligence is contained in the spacing between the carrier and sideband frequencies. A-35. The highest modulating frequency. A-36. The depth or degree of modulation. A-37. One-half the amplitude of the carrier. A-38. A-39. Modulation produced in the plate circuit of the last radio stage of the system. A-40. Class C. A-41. Power amplifier. A-42. Between 0 and nearly two times its unmodulated value. A-43. Plate modulator. A-44. In cases when the use of a minimum of af modulator power is desired. A-45. Low-level. A-46. Gain is varied by changing the voltage on the emitter.