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Encoding USS Code 39 in Software Test: Part Four 615

Test: Part Four 615
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Test 4-2 Illustration for Part 4 Test Questions 24 and 25.
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(c) inverse parallel. (d) push-push. (e) push-pull. 25. The circuit in Fig. Test4-2 would be a bad choice for use as a medium-power audio amplifier because (a) bipolar transistors do not work well in audio applications. (b) transformers should not be used in audio amplifiers. (c) this type of circuit invariably produces a lot of distortion. (d) this type of circuit cannot produce appreciable output power. (e) Hold it! The circuit in Fig. Test4-2 would be a good choice for use as a medium-power audio amplifier. 26. In an electrostatic CRT, the electron beam can be diverted up and down by (a) synchronization pulses applied to the deflecting coils. (b) ELF radiation from the accelerating anodes. (c) charged plates that attract or repel moving electrons. (d) modulation of the signal on the control grid. (e) variable input to the electron gun.
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27. A device that translates 500-Hz sound waves into ac by means of the interaction between a permanent magnet and a coil of wire is an example of (a) an electromechanical loudspeaker. (b) a passive pressure sensor. (c) a dynamic transducer. (d) an inductive proximity sensor. (e) a piezoelectric transducer. 28. Which of the following considerations is most important in a hi-fi audio power amplifier (a) Optimizing the efficiency (b) Minimizing the operating voltage (c) Maximizing the linearity (d) Maximizing the driving power (e) Biasing beyond the cutoff point 29. A loopstick antenna, oriented so its ends point toward the eastern and western horizons, exhibits (a) nulls in the response to signals coming from the east and west. (b) peaks in the response to signals coming from the east and west. (c) nulls in the response to signals coming from the north and south. (d) an omnidirectional response in three-dimensional space. (e) a peak in the response to signals coming from any horizontal direction, and a null in the response to signals coming from the zenith (directly overhead). functions by sensing 30. Fill in the blank to make the following sentence true: An variations in the relative phase of acoustic waves reflected from objects in the environment. (a) IR transducer (b) acoustic transponder (c) electrostatic loudspeaker (d) ultrasonic motion detector (e) acoustic pressure sensor 31. Which of the following is an advantage of a large LCD over a large CRT display (a) Lower cost (b) Lighter weight (c) Greater ELF radiation (d) The use of electron beams and deflecting coils (e) All of the above 32. An op amp can produce or facilitate (a) a low signal-to-noise ratio in an oscillator. (b) improved efficiency in an antenna system.
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Test: Part Four 617
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(c) high signal gain over a wide range of frequencies. (d) a match between a feed line and an antenna. (e) none of the above. 33. Which of the following is an application of a gas-filled tube (a) A high-frequency RF power amplifier (b) A microwave oscillator (c) An audio oscillator or amplifier (d) Decorative lighting (e) Impedance matching in an antenna system 34. For a communications satellite with an elliptical orbit around the earth, the point at which the altitude is lowest is the (a) geominimum. (b) proxima. (c) perigee. (d) approach. (e) optimum. 35. Suppose an antenna has a radiation resistance of 35 and its feed line has a characteristic impedance of 50 . What is the efficiency of the antenna (a) 15 percent (b) 41 percent (c) 59 percent (d) 70 percent (e) Impossible to calculate from this information 36. Which of the following is a characteristic of a stepper motor (a) It rotates in defined increments, not continuously. (b) Its turning power increases as its speed increases. (c) It cannot rotate faster than approximately 1 rpm. (d) It is not suitable for use in mechanical devices, but only in sensors. (e) It operates without an external source of power. 37. With respect to ICs, terms such as MSI, LSI, and VLSI define the (a) maximum number of transistors on the chip. (b) maximum frequency at which the chip can operate. (c) maximum power output the chip can produce. (d) maximum gain the chip can produce. (e) maximum number of switching operations the chip can perform per second.
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