5 1-39.   If you require a microphone that is lightweight, has high sensitivity, is rugged, requires no external voltage, can withstand temperature, vibration, and moisture extremes, and has a uniform frequency response of 40 to 15,000 hertz, which of the following types of microphones should you select? 1.  Carbon 2.  Crystal 3.  Dynamic 4.  Electrostatic 1-40.   What component in a magnetic microphone causes the lines of flux to alternate? 1.  The coil 2.  The magnet 3.  The diaphragm 4.  The armature 1-41.   What are the two major sections of an AM transmitter? 1.  Audio frequency unit and radio frequency unit 2.  Audio frequency unit and master oscillator 3.  Audio frequency unit and final power amplifier 4.  Audio frequency unit and intermediate power amplifier 1-42.   The intermediate power amplifier serves what function in a transmitter? 1.  It generates the carrier 2.  It modulates the carrier 3.  It increases the frequency of the signal 4.  It increases the power level of the signal 1-43.   The final audio stage in an AM transmitter is the 1.  mixer 2.  modulator 3.  multipler 4.  multiplexer 1-44.   The vertical axis on a frequency- spectrum graph represents which of the following waveform characteristics? 1.  Phase 2.  Duration 3.  Frequency 4.  Amplitude 1-45.   When a 500-hertz signal modulates a 1-megahertz carrier, the 1-megahertz carrier and what two other frequencies are transmitted? 1.         500 and   999,500 hertz 2.         500 and 1,000,500 hertz 3.  999,500 and 1,500,000 hertz 4.  999,500 and 1,000,500 hertz 1-46.   If 750 hertz modulates a 100-kilohertz carrier, what would the upper-sideband frequency be? 1.    99,250 hertz 2.  100,000 hertz 3.  100,500 hertz 4.  100,750 hertz 1-47.   In an AM wave, where is the audio intelligence located? 1.  In the carrier frequency 2.  In the spacing between the sideband frequencies 3.  In the spacing between the carrier and sideband frequencies 4.  In the sideband frequencies