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7. A screen grid enhances tube operation by (a) increasing the gain, helping the circuit to oscillate more easily. (b) decreasing the plate voltage required to produce oscillation. (c) minimizing the risk that a tube amplifier will break into oscillation. (d) pulling excess electrons from the plate. 8. A tube with three grids is called a (a) triode. (b) tetrode. (c) pentode. (d) hexode. 9. A tube with four grids is called a (a) triode. (b) tetrode. (c) pentode. (d) hexode. 10. An advantage of a grounded-grid RF power amplifier over a grounded-cathode RF power amplifier is the fact that the grounded-grid circuit (a) has excellent sensitivity. (b) exhibits high input impedance. (c) produces little or no noise in the input. (d) is more stable. 11. A heptode tube has (a) one plate. (b) two plates. (c) three plates. (d) four plates. 12. The electron gun in a CRT is another name for its (a) cathode. (b) anode. (c) control grid. (d) screen grid. 13. The electron beam in an electrostatic CRT is bent by (a) magnetic fields produced by current-carrying coils. (b) electric fields produced by charged electrodes. (c) a variable voltage on the screen grid. (d) visible light striking the electrodes.
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14. A grounded-grid RF power amplifier (a) requires more driving power, for a given RF power output, than a grounded-cathode RF power amplifier. (b) requires less driving power, for a given RF power output, than a grounded-cathode RF power amplifier. (c) oscillates at a more stable frequency than a grounded-cathode RF power amplifier. (d) oscillates at a less stable frequency than a grounded-cathode RF power amplifier. 15. In a Klystron, the electron-beam density varies as a result of (a) amplitude modulation. (b) pulse modulation. (c) velocity modulation. (d) frequency modulation. 16. A vidicon camera tube is noted for its (a) poor signal-to-noise ratio. (b) large size and heavy weight. (c) slow response to image movement in dim light. (d) excellent selectivity and electrical ruggedness. 17. The plate in a tetrode tube is normally connected to (a) a positive dc power-supply voltage. (b) a negative dc power-supply voltage. (c) electrical ground. (d) RF ground. 18. The screen grid in a tetrode tube is normally connected to (a) a positive dc power-supply voltage. (b) a negative dc power-supply voltage. (c) electrical ground. (d) RF ground. 19. Which of the following is most suitable for measuring the intensity of dim light (a) A triode gas-filled tube (b) A photomultiplier tube (c) An electrostatic CRT (d) An electromagnetic CRT 20. In a dissector tube, the aperture size is directly related to the (a) operating voltage. (b) signal-to-noise ratio. (c) response speed. (d) image resolution.
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CHAPTER
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Transducers, Sensors, Location, and Navigation
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IN THIS CHAPTER, YOU LL LEARN ABOUT ELECTRONIC DEVICES THAT CONVERT ENERGY FROM ONE
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form to another, devices that can detect phenomena and measure their intensity, systems that can help you find out where you are (or where some other object is), and devices that facilitate navigation for vessels such as ships, aircraft, and robots.
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In electronics, wave transducers convert ac or dc into acoustic or electromagnetic (EM) waves. They can also convert these waves into ac or dc signals.
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Dynamic Transducer for Sound A dynamic transducer is a coil-and-magnet device that translates mechanical vibration into varying electrical current, and can also do the reverse. The most common examples are the dynamic microphone and the dynamic speaker. Figure 30-1 shows a functional diagram of a dynamic transducer. A diaphragm is attached to a coil that is mounted so it can move back and forth rapidly along its axis. A permanent magnet is placed inside the coil. Sound waves cause the diaphragm to move; this moves the coil, which causes fluctuations in the magnetic field within the coil. The result is ac output from the coil, having the same waveform as the sound waves that strike the diaphragm. If an audio signal is applied to the coil, it generates a magnetic field that produces forces on the coil. This causes the coil to move, pushing the diaphragm back and forth, creating acoustic waves in the surrounding medium. Electrostatic Transducer for Sound An electrostatic transducer takes advantage of the forces produced by electric fields. Two metal plates, one flexible and the other rigid, are placed parallel to each other and close together (Fig. 30-2). In an electrostatic pickup, incoming sound waves vibrate the flexible plate. This produces small, rapid changes in the spacing, and therefore the capacitance, between the two plates. A dc voltage is
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