# Teach Yourself Electricity and Electronics Examination Part 3

The third part test that includes the next 12 Chapters of the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco.

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:

• B. A high-power radio-frequency linear amplifier.
• C. A low-level audio amplifier.
• D. A digital computer.

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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