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Teach Yourself Electricity and Electronics Examination Part 3

Multiple choice questions in Teach Yourself Electricity and Electronics Examination Part 3

This is the Part 3 Examination Test (Basic Electronics) that includes the succeeding 12 Chapters of the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Topics Included in the Test from Chapter 19 to Chapter 30

Part 3: Basic Electronics
Chapter 24: MCQs in Amplifiers

Start Practice Exam Test Questions

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. An arc.
  • C. A transient.
  • D. An avalanche.
  • E. A clamp.

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.

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.

17. When both N-channel and P-channel transistors are found in a metal-oxide-semiconductor-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. Class AB.
  • C. Class B.
  • D. Class C.

E. Any of the above can be as efficient as any other.

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.

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.
  • 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. Magnetic media.
  • B. IC memory.
  • C. Tape memory.
  • D. Bubble memory.
  • E. 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.
  • 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. 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.

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:

  • 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.
  • 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.
  • B. Avalanche effect.
  • C. Forward breakover.
  • D. An excess of charge carriers.
  • E. Conduction 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.

Complete List of Multiple Choice Questions from this Book

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