Thursday, October 23, 2014

Teach Yourself Electricity and Electronics Examination Part 3 - Answers

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Answers key in Teach Yourself Electricity and Electronics Examination Part 3 MCQs

Below are the answers key for the Part 3 Examination Test that includes the the succeeding 12 Chapters of the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco.

1. E. Gate.

2. B. Nonlinearity.

3. A. Parallel modulation.

4. C. A transient.

5. A. Negative feedback.

6. C. The D layer.

7. A. Current amplification factor.

8.  D. An inductor.

9. E. Stability.

10. D. A power supply regulating circuit.

11. D. Pinchoff.

12. B. A high-power radio-frequency linear amplifier.

13. C. Holes.

14. C. The output is hard to filter.

15. D. 1000.

16. C. 225 W.

17. B. CMOS.

18. E. A radio-frequency power amplifier.

19. B. A digital computer.

20. D. Class C.

21. C. Teleprinter code.

22. E. A quartz crystal.

23. A. It is a sign of improper bias.

24. B. 8.

25. D. Sensitivity.

26. A. The width of the depletion region.

27. C. Slanted with respect to the edges of the tape.

28. E. A capacitor in parallel with the dc output.

29. A. Common emitter.

30. D. Bubble memory.

31. C. A Gunn diode.

32. C. The collector is negative relative to the emitter.

33. C. The beam is bent by an electric field.

34. B. SSB.

35. E. A magnetron.

36. D. Only when all inputs are high.

37. A. A varactor diode.

38. E. Higher power-handling capacity.

39. B. 31 dB.

40. E. Only when the inputs have opposite logic states.

41. C. FM.

42. D. The control grid.

43. A. Pulse amplitude modulation.

44. B. A useful tool in digital logic circuit design.

45. A. Circuits that need low current at high voltage.

46. B. An LED and a photodiode.

47. B. Avalanche effect.

48. C. Keep the image from tearing or rolling.

49. E. The channel does not conduct with zero gate bias.

50. B. The secondary voltage is more than the primary voltage.


Published by: Froyd Wess17:04

Teach Yourself Electricity and Electronics Examination Part 3

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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

Begin the 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. 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.

Published by: Froyd Wess16:58

Basic Digital Principles - Gibilisco MCQs in Electronics - Answers

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Answers key in Basic Digital Principles MCQs

Below are the answers key for the Multiple Choice Questions (MCQs) in Chapter 30: Basic Digital Principles from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco.

1. C. 10111.

2. A. 49.

3. D. 16.

4. D. 63.

5. C. + 4 V.

6. D. + 12 V.

7. A. There is not enough information to tell.

8.  B. Low.

9. B. Low.

10. D. This logic statement makes no sense.

11. C. 16.

12. A. Serial.

13. D. Always 1.

14. A. Always 0.

15. C. The J-K always has predictable outputs.

16. C. The pulse level is going from low to high.

17. D. Set and reset.

18. A. The outputs stay as they are.

19. D. The resulting outputs can be absurd.

20. B. A divider.


Published by: Froyd Wess16:40

Basic Digital Principles - Gibilisco MCQs in Electronics

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Multiple choice questions in Basic Digital Principles

This is the Multiple Choice Questions (MCQs) in Chapter 30: Basic Digital Principles from 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.

Begin the Test

1. The value of the decimal number 23 in binary form is:

  • A. 1011.
  • B. 110111.
  • C. 10111.
  • D. 11100.

2. The binary number 110001 represents the digital number:

  • A. 49.
  • B. 25.
  • C. 21.
  • D. 13.

3. The fifth digit from the right in a binary number carries a decimal value of:

  • A. 64.
  • B. 32.
  • C. 24.
  • D. 16.

4. The largest possible decimal number that can be represented by six binary digits (bits) is:

  • A. 256.
  • B. 128.
  • C. 64.
  • D. 63.

5. Which of the following voltages could normally represent a 1 in positive logic?

  • A. 0 V.
  • B. + 1 V.
  • C. + 4 V.
  • D. + 12 V.

6. Which of the following voltages might normally represent a 1 in negative logic?

  • A. 0 V.
  • B. + 4 V.
  • C. + 6 V.
  • D. + 12 V.

7. If X is low, what is the state of X AND Y?

  • A. There is not enough information to tell.
  • B. Low.
  • C. High.
  • D. This logic statement makes no sense.

8. If X is high, what is the state of X NOR Y?

  • A. There is not enough information to tell.
  • B. Low.
  • C. High.
  • D. This logic statement makes no sense.

9. If X and Y are both high, what is the state of X NAND Y?

  • A. There is not enough information to tell.
  • B. Low.
  • C. High.
  • D. This logic statement makes no sense.

10. If X is high and Y is low, what is the state of X NOT Y?

  • A. There is not enough information to tell.
  • B. Low.
  • C. High.
  • D. This logic statement makes no sense.

11. A logic circuit has four inputs W, X, Y, and Z. How many possible input combinations are there?

  • A. 4.
  • B. 8.
  • C. 16.
  • D. 32.

12. Data sent along a single line, one bit after another, is called:

  • A. Serial.
  • B. Synchronous.
  • C. Parallel.
  • D. Asynchronous.

13. If X = 1 and Y = 1, then X + YZ is:

  • A. Always 0.
  • B. 0 if Z = 0, and 1 if Z = 1.
  • C. 1 if Z = 0, and 0 if Z = 1.
  • D. Always 1.

14. If X = 0 and Y = 1, then X(Y + Z) is:

  • A. Always 0.
  • B. 0 if Z = 0, and 1 if Z = 1.
  • C. 1 if Z = 0, and 0 if Z = 1.
  • D. Always 1.

15. An advantage of a J-K over an R-S flip-flop is that:

  • A. The J-K flip-flop is faster.
  • B. The J-K can attain more states.
  • C. The J-K always has predictable outputs.
  • D. No! An R-S flip-flop is superior to a J-K.

16. In positive-edge triggering, the change of state occurs when:

  • A. The pulse level is high.
  • B. The pulse level is going from high to low.
  • C. The pulse level is going from low to high.
  • D. The pulse level is low.

17. The inputs of an R-S flip-flop are known as:

  • A. Low and high.
  • B. Asynchronous.
  • C. Synchronous.
  • D. Set and reset.

18. When both inputs of an R-S flip-flop are 0:

  • 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.

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.

Published by: Froyd Wess16:37

Electron Tubes - Gibilisco MCQs in Electronics - Answers

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Answers key in Electron Tubes MCQs

Below are the answers key for the Multiple Choice Questions (MCQs) in Chapter 29: Electron Tubes from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco.

1. Triodes need more voltage.

2. Gate of an FET.

3. The gate voltage.

4. A gas-filled regulator.

5. The filament serves as the cathode.

6. There is no filament.

7. Decreasing the grid-to-plate capacitance.

8.  Pentode.

9. Is bulky and heavy.

10. Good stability.

11. Five grids.

12. Cathode.

13. An electric field.

14. Time per unit division.

15. Vertical deflection plates or coils.

16. Sensitivity.

17. The achievable power output decreases.

18. The longitudinal magnetic flux.

19. High achievable output power.

20. Have variable speed.


Published by: Froyd Wess16:32

Electron Tubes - Gibilisco MCQs in Electronics

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Multiple choice questions in Electron Tubes

This is the Multiple Choice Questions (MCQs) in Chapter 29: Electron Tubes from 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.

Begin the Test

1. One difference between a triode and an N-channel FET is that:

  • A. Triodes work with lower voltages.
  • B. Triodes are more compact.
  • C. Triodes need more voltage.
  • D. Triodes don’t need filaments.

2. The control grid of a tube corresponds to the:

  • A. Source of an FET.
  • B. Collector of a bipolar transistor.
  • C. Anode of a diode.
  • D. Gate of an FET.

3. The intensity of the electron flow in a vacuum tube depends on all of the following except:

  • A. The gate voltage.
  • B. The power supply voltage.
  • C. The grid voltage.
  • D. The voltage between the cathode and the plate.

4. Which type of tube maintains constant voltage drop with changes in current?

  • A. A triode.
  • B. A gas-filled regulator.
  • C. A tetrode.
  • D. A pentagrid converter.

5. In a tube with a directly heated cathode:

  • A. The filament is separate from the cathode.
  • B. The grid is connected to the filament.
  • C. The filament serves as the cathode.
  • D. There is no filament.

6. In a tube with a cold cathode:

  • A. The filament is separate from the cathode.
  • B. The grid is connected to the filament.
  • C. The filament serves as the cathode.
  • D. There is no filament.

7. A screen grid enhances tube operation by:

  • A. Decreasing the gain.
  • B. Decreasing the plate voltage.
  • C. Decreasing the grid-to-plate capacitance.
  • 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 type radio receiver:

  • A. Is bulky and heavy.
  • B. Requires low voltage.
  • C. Is more sensitive than a transistorized radio.
  • D. All of the above.

10. An advantage of a grounded-grid power amplifier is:

  • A. Excellent sensitivity.
  • B. High impedance.
  • C. Low noise.
  • D. Good stability.

11. A heptode tube has:

  • A. Two grids.
  • B. Three grids.
  • C. Five grids.
  • D. Seven grids.

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. A magnetic field.
  • B. An electric field.
  • C. A fluctuating current.
  • D. A constant current.

14. The horizontal displacement on an oscilloscope CRT screen is usually measured in:

  • A. Frequency per unit division.
  • B. Current per unit division.
  • C. Time per unit division.
  • D. Voltage per unit division.

15. In a time-domain oscilloscope, the waveform to be analyzed is usually applied to the:

  • A. Control grid plates or coils.
  • B. Anode plates or coils.
  • C. Vertical deflection plates or coils.
  • D. Horizontal deflection plates or coils.

16. A vidicon camera tube is noted for its:

  • A. Sensitivity.
  • B. Large size.
  • C. Heavy weight.
  • D. Rapid response.

17. In a magnetron, as the frequency is increased:

  • A. The achievable power output increases.
  • B. The achievable power output decreases.
  • C. The output power stays the same.
  • D. The output power increases and decreases alternately.

18. The paths of the electrons in a magnetron are spirals, rather than straight lines, because of:

  • A. The extreme voltage used.
  • B. The longitudinal magnetic flux.
  • C. The bunching-up of the electrons.
  • D. The shapes of the cavities.

19. A klystron is noted for its:

  • A. Spiralling electrons.
  • B. Low noise output.
  • C. High achievable output power.
  • D. Magnetic-field intensity.

20. In a multicavity klystron, the electrons:

  • A. Have variable speed.
  • B. Travel in circles.
  • C. Are reflected by the cavities.
  • D. Are drawn out via the cathode.

Published by: Froyd Wess16:29

Integrated Circuits and Data Storage Media - MCQs in Electronics - Answers

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Answers key in Integrated Circuits and Data Storage Media MCQs

Below are the answers key for the Multiple Choice Questions (MCQs) in Chapter 28: Integrated Circuits and Data Storage Media from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco.

1. Higher switching speeds are attainable.

2. Greater power capability.

3. A radio broadcast transmitter’s final amplifier.

4. Inductors.

5. Control the gain.

6. A multiplexer/demultiplexer.

7. A comparator.

8.  Transistor-transistor logic.

9. Ability to handle high power levels.

10. The size of the semiconductor atoms.

11. It’s easy to get data out, but hard to put it in.

12. It’s easy to get data out and put it in.

13. EPROM.

14. About 1,000 bytes.

15. The tracks are parallel to the edges.

16. The video tracks are diagonal.

17. Disks allow faster data storage and retrieval.

18. 1 mil.

19. Via magnetic fields.

20. Nothing touches the disk.


Published by: Froyd Wess16:22