4 1-29.   Which of the following advantages is a benefit of cw communications? 1.   Wide bandwidth 2.   Fast transmission 3.   Long-range operation 4.   Each of the above 1-30.   To prevent a transmitter from being loaded unnecessarily, where should you connect the antenna? 1.   At the oscillator input 2.   At the oscillator output 3.   At the power-amplifier input 4.   At the power-amplifier output 1-31.   Amplifier tubes are added to the output of a transmitter for which of the following reasons? 1.   To increase power 2.   To increase frequency 3.   To increase stability 4.   To increase selectivity 1-32.   Which of the following combinations of frequency multiplier stages will produce a total multiplication factor of 72? 1.   36, 36 2.   4, 3, 3, 2 3.   4, 4, 3, 2 4.   18, 18, 18, 18 1-33.   To change sound energy into electrical energy, which of the following devices should you use? 1.   A speaker 2.   A microphone 3.   An amplifier 4.   An oscillator 1-34.   Which of the following is the schematic symbol for a microphone? 1. 3. 2. 4. 1-35.   What component in a carbon microphone converts a dc voltage into a varying current? 1.   Button 2.   Diaphragm 3.   Transformer 4.   Carbon granules 1-36.   The action of the double-button carbon microphone is similar to which of the following electronic circuits? 1.   A limiter 2.   An oscillator 3.   A voltage doulber 4.   A push-pull amlifier 1-37.   A carbon microphone has which of the following advantages over other types of microphones? 1.   Ruggedness 2.   Sensitivity 3.   Low output voltage 4.   Frequency response 1-38.   The voltage produced by mechanical stress placed on certain crystals is a result of which of the following effects? 1.   Hall 2.   Acoustic 3.   Electrostatic 4.   Piezoelectric