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Quiz 571 19. When both inputs of an R-S flip-flop are 1: A. The outputs stay as they are. B. Q 0 and Q 1. C. Q 1 and Q 0. D. The resulting outputs can be absurd. 20. A frequency synthesizer makes use of A. An OR gate. B. A divider. C. The octal numbering system. D. The hexadecimal numbering system.
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Test: Part Three
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Do not refer to the text when taking this test. 1. In a junction FET, the control electrode is usually the: A. Source. B. Emitter. C. Drain. D. Base. E. Gate. 2. A diode can be used as a frequency multiplier because of its: A. Junction capacitance. B. Nonlinearity. C. Avalanche voltage. D. Forward breakover. E. Charge-carrier concentration. 3. Which of the following is not a common form of data transmission A. Parallel modulation. B. Frequency modulation. C. Amplitude modulation. D. Phase modulation. E. Pulse modulation. 4. A very brief, high-voltage spike on an ac power line is called: A. A surge. B. C. D. F. 572 An arc. A transient. An avalanche. A clamp.
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Test: Part three 573 5. Which of the following is not characteristic of an oscillator A. Negative feedback. B. Good output-to-input coupling. C. Reasonably high transistor gain. D. Ac output. E. Usefulness as a signal generator. 6. Which layer of the ionosphere absorbs radio signals below about 7 MHz during the daylight hours A. The F layer. B. The E layer. C. The D layer. D. The C layer. E. The B layer. 7. The beta of a bipolar transistor is its: A. Current amplification factor. B. Voltage amplification factor. C. Power amplification factor. D. Maximum amplification frequency. E. Optimum amplification frequency. 8. Which type of component is impractical to fabricate on a silicon chip A. A capacitor. B. A transistor. C. A diode. D. An inductor. E. Any component can be fabricated on a silicon chip. 9. The extent to which an oscillator maintains a constant frequency is called its: A. Sensitivity. B. Drift ratio. C. Gain. D. Selectivity. E. Stability. 10. A Zener diode would most likely be used in: A. A mixer. B. A voltage-controlled oscillator. C. A detector. D. A power supply regulating circuit. E. An oscillator.
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574 Test: Part three 11. When the bias in an FET stops the flow of current, the condition is called: A. Forward breakover. B. Cutoff. C. Reverse bias. D. Pinchoff. E. Avalanche. 12. A vacuum tube would most likely be found in: A. The front end of a radio receiver. B. A high-power radio-frequency linear amplifier. C. A low-level audio amplifier. D. A digital computer. E. Antique radios only. 13. In an N-type semiconductor, the minority carriers are: A. Electrons. B. Protons. C. Holes. D. Neutrons. E. Silicon chips. 14. A disadvantage of a half-wave rectifier is that: A. The voltage is excessive. B. The current output is low. C. The output is hard to filter. D. It needs many diodes. E. The transformer must have a center tap. 15. A power gain of 30 dB is equivalent to an amplification factor of: A. 0.001. B. 1/30. C. 30. D. 1000. E. None of the above. 16. An amplifier has a dc collector power input of 300 W, and is 75.0 percent efficient. The signal output power is: A. 400 W. B. 300 W. C. 225 W. D. Variable, depending on the bias. E. Impossible to determine from this data.
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Test: Part three 575 17. When both N-channel and P-channel transistors are found in a metal-oxidesemiconductor-type integrated circuit, the technology is known as: A. Transistor-transistor logic. B. CMOS. C. Bipolar logic. D. NPNP. E. PNPN. 18. A common-base circuit is commonly employed as: A. A microwave oscillator. B. A low-pass filter. C. A noise generator. D. A phase-locked loop. E. A radio-frequency power amplifier. 19. Which of the following devices always uses an IC as one of its main active components A. A radio-frequency power amplifier. B. A digital computer. C. A low-level audio amplifier. D. A power transformer. E. An impedance matching network. 20. Which type of amplifier circuit provides the greatest efficiency A. Class A. B. C. D. E. Class AB. Class B. Class C. Any of the above can be as efficient as any other.
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21. ASCII is a form of: A. Video modulation. B. Diode. C. Teleprinter code. D. Voice modulation. E. AM detector. 22. The most stable type of oscillator circuit uses: A. A tapped coil. B. A split capacitor. C. Negative feedback. D. A common-base arrangement. E. A quartz crystal.
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576 Test: Part three 23. If the source-gate junction in an FET conducts: A. It is a sign of improper bias. B. The device will work in class C. C. The device will oscillate. D. The device will work in class A. E. The circuit will have good stability. 24. The octal number system uses modulo: A. 2. B. 8. C. 10. D. 12. E. 16. 25. Signal-plus-noise-to-noise ratio (S N/N) is often specified when stating a receiver s: A. Selectivity. B. Stability. C. Modulation coefficient. D. Sensitivity. E. Polarization. 26. In a reverse-biased semiconductor diode, the capacitance depends on: A. The width of the depletion region. B. The reverse current. C. The P:N ratio. D. The gate bias. E. The avalanche voltage. 27. The effective speed of a recording or playback head with respect to the data on a tape can be maximized by making the tracks: A. Parallel with the edges of the tape. B. Perpendicular to the edges of the tape. C. Slanted with respect to the edges of the tape. D. Elliptically polarized. E. Rectangularly polarized. 28. A simple power supply filter can be built with: A. A capacitor in series with the dc output. B. An inductor in parallel with the dc output. C. A rectifier in parallel with the dc output.
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Test: Part three 577 D. A resistor in series and an inductor in parallel with the dc output. E. A capacitor in parallel with the dc output. 29. Which of the following bipolar-transistor circuits can, in theory, provide the most amplification A. Common emitter. B. Common base. C. Common collector. D. Common gate. E. Common drain. 30. Magnetic fields within ICs can store data in a device called: A. B. C. D. E. Magnetic media. IC memory. Tape memory. Bubble memory. Random-access memory.
31. An example of a device that commonly oscillates is: A. A rectifier diode. B. A weak-signal diode. C. A Gunn diode. D. A Zener diode. E. An avalanche diode. 32. In a PNP bipolar transistor: A. The collector is positive relative to the emitter. B. The collector is at the same voltage as the emitter. C. The collector is negative relative to the emitter. D. The collector might be either positive or negative relative to the emitter. E. The collector must be at ground potential. 33. In a cathode-ray tube (CRT), the term electrostatic deflection means: A. The device is not working correctly. B. Static electricity is distorting the image. C. The beam is bent by an electric field. D. The beam is bent by coils carrying a variable current. E. Nothing! There is no such thing as electrostatic deflection in a CRT. 34. Which type of modulation consists of one voice sideband, with a suppressed carrier A. AM.
578 Test: Part three B. SSB. C. FM. D. RTTY. E. PCM. 35. A type of electron tube that can be used to generate microwave energy is: A. A triode. B. An oscillotron. C. A cathode-ray tube. D. A videotron. E. A magnetron. 36. In an AND gate, the output is high: A. If any input is high. B. C. D. E. Only when all inputs are low. If any input is low. Only when all inputs are high. Only when the inputs have opposite logic states.
37. A voltage-controlled oscillator makes use of: A. A varactor diode. B. A Zener diode. C. Negative feedback. D. A split capacitance. E. Adjustable gate or base bias. 38. Which of the following is not an advantage of a transistor over a vacuum tube A. Smaller size. B. Lighter weight. C. Less heat generation. D. Lower operating voltages. E. Higher power-handling capacity. 39. An amplifier has an output signal voltage that is 35 times the input signal voltage. This is a gain of: A. 15 dB. B. 31 dB. C. 35 dB. D. 350 dB. E. 700 dB. 40. In an exclusive OR gate, the output is high:
Test: Part three 579 A. If any input is high. B. Only when all inputs are low. C. If any input is low. D. Only when all inputs are high. E. Only when the inputs have opposite logic states. 41. A ratio detector is a circuit for demodulating: A. AM. B. PM. C. FM. D. SSB. E. AFSK. 42. In a radio-frequency power amplifier using a vacuum tube, stability can be enhanced by using a circuit in which the following electrode is at RF ground potential: A. The cathode. B. The plate. C. The filament. D. The control grid. E. The screen grid. 43. A method of modulation in which the strength of pulses varies is called: A. Pulse amplitude modulation. B. Pulse position modulation. C. Pulse frequency modulation. D. Pulse ratio modulation. E. Pulse width modulation. 44. Boolean algebra is: A. Just like ordinary algebra. B. A useful tool in digital logic circuit design. C. Used to calculate the value of an unknown. D. Used with negative logic only. E. Used with positive logic only. 45. A voltage-doubler power supply is best for use in: A. Circuits that need low current at high voltage. B. Low-voltage devices. C. High-current appliances. D. All kinds of electronic equipment.
580 Test: Part three E. Broadcast transmitter power amplifiers. 46. An optoisolator consists of: A. Two Zener diodes back to back. B. An LED and a photodiode. C. Two NPN transistors in series. D. An NPN transistor followed by a PNP transistor. E. A PNP transistor followed by an NPN transistor. 47. When a semiconductor is reverse-biased with a large enough voltage, it will conduct. This is because of: A. Bias effect.
48. Synchronizing pulses in a video signal: A. Keep the brightness constant. B. Keep the contrast constant. C. Keep the image from tearing or rolling. D. Ensure that the colors are right. E. Keep the image in good focus.
49. In an enhancement-mode MOSFET: A. The channel conducts fully with zero gate bias. B. The channel conducts partially with zero gate bias. C. The channel conducts ac but not dc. D. The channel conducts dc but not ac. E. The channel does not conduct with zero gate bias. 50. In a step-up power transformer: A. The primary voltage is more than the secondary voltage. B. The secondary voltage is more than the primary voltage. C. The primary and secondary voltages are the same. D. The secondary must be center-tapped. E. The primary must be center-tapped. A good score is at least 37 correct. Answers are in the back of the book. It s best to have a friend check your score the first time, so you won t memorize the answers if you want to take the test again.
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