# Teach Yourself Electricity and Electronics Final Examination

The Teach Yourself Electricity and Electronics Final Examination that could test your knowledge and learning after reading the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco.

This is the Teach Yourself Electricity and Electronics Final Examination that could test your knowledge and learning after reading 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. This is also serve as your Pre-board exam in Engineering Electronics.

### Start Practice Exam Test Questions

1. As the frequency of ac increases in a coil, the reactance:

• A. Gets larger negatively.
• B. Gets smaller negatively.
• C. Stays the same.
• D. Gets larger positively.
• E. Gets smaller positively.

2. A beat-frequency oscillator is useful for:

• A. Generating FM.
• B. Detecting FM.
• C. Generating CW.
• D. Detecting CW.
• E. Any of the above.

3. A Colpitts circuit is a form of:

• A. Amplifier.
• B. Detector.
• C. Modulator.
• D. Oscillator.
• E. Rectifier.

4. The high component density of integrated circuits acts to:

• A. Maximize the power output.
• B. Increase the current drain.
• C. Increase the voltage requirements.
• D. Increase the operating speed.
• E. Reduce the frequency range.

5. A utility meter generally measures:

• A. Watts.
• B. Amperes.
• C. Kilowatt hours.
• D. Kilowatts.
• E. Volt hours.

6. High voltages are better than low voltages for long-distance electric power transmission because:

• A. The lines can better withstand lightning strokes.
• B. The magnetic fields are weaker.
• C. The electric fields are weaker.
• D. The I2R losses are lower.
• E. No. Low voltages are better.

7. A member of a fleet of robots, all under the control of a single central

computer and able to communicate only with that computer and not with

each other, is called:

• A. An android.
• B. An autonomous robot.
• C. A dependent robot.
• D. An independent robot.
• E. An insect robot.

8. An advantage of a laser printer over a dot-matrix printer for computer

applications is:

• A. Lower cost.
• B. Superior image quality.
• C. Greater bandwidth.
• D. Lower resolution.
• E. Better voltage regulation.

9. The output electrode of a bipolar transistor is usually the:

• A. Grid.
• B. Gate.
• C. Base.
• D. Source.
• E. Collector.

10. The schematic symbol for an op amp is:

• A. A triangle.
• B. A circle.
• C. A circle with a line through it.
• D. A rectangle.
• E. A D-shaped figure.

11. For a given value of capacitance, as the frequency goes down, the reactance:

• A. Approaches zero from the negative side.
• B. Gets more and more negative.
• C. Approaches zero from the positive side.
• D. Gets more and more positive.
• E. Stays the same.

12. In a 360-Hz wave, a degree of phase represents:

• A. 1.00 second.
• B. 1/360 second.
• C. 360 milliseconds.
• D. 7.72 microseconds.
• E. A quantity you can’t calculate from this data.

13. A device that converts visible light into dc is:

• A. A phototransistor.
• B. A photovoltaic cell.
• C. An optovoltaic cell.
• D. An optocell.
• E. An optoisolator.

14. Which of the following is not an example of wireless?

• A. The connection between a computer and its monitor.
• B. A cellular telephone system.
• C. The Global Positioning System.
• D. A beeper.
• E. A LEO satellite system.

15. A circuit has a battery of 3.0 V and a bulb with a resistance of 12.0 ohms. The current through the bulb is:

• A. 36 A.
• B. 4.0 A.
• C. 250 mA.
• D. 40 mA.
• E. 36 mA.

16. A small 9-V battery might be used to provide power to:

• A. An electronic calculator.
• B. A personal computer.
• D. An electric iron.
• E. Any of the above.

17. In an AM voice signal, the audio information is:

• A. Exactly at the carrier frequency.
• B. Contained in sidebands.
• C. At harmonics of the carrier frequency.
• D. Rectified before being impressed onto the carrier.
• E. Detected before being impressed onto the carrier.

18. The oscillating frequency of a quartz crystal can be varied slightly by:

• A. Changing the bias on the transistor.
• B. Changing the voltage across the varactor.
• C. Reversing the power supply polarity.
• D. Placing a small variable capacitor across the crystal.
• E. No. The frequency of a crystal cannot be changed at all.

19. When several resistances are connected in series:

• A. The current is the same through each one.
• B. The voltage is the same across each one.
• C. Both A and B are true.
• D. Neither A nor B is true.
• E. They must all have the same value.

20. In a power supply, resistors are sometimes connected in series with the diodes in order to:

• A. Increase the current output.
• B. Protect the diodes against surge currents.
• C. Help the diodes discharge.
• D. Bleed charge from the filter capacitors.
• E. Regulate the output voltage.

21. In a purely resistive impedance, there is:

• A. A net capacitance.
• B. A net inductance.
• C. Zero resistance.
• D. Zero reactance.
• E. Zero conductance.

22. Two 400-Î¼H inductors are connected in series. There is no mutual inductance. The total inductance is:

• A. 100 Î¼H.
• B. 200 Î¼H.
• C. 400 Î¼H.
• D. 800 Î¼H.
• E. 1.6 mH.

23. The current-carrying part of a field-effect transistor, analogous to a garden hose in some ways, is called the:

• A. Source.
• B. Gate.
• C. Drain.
• D. Source-drain junction.
• E. Channel.

24. In a rectifier diode, current flows for approximately how much of the ac cycle?

• A. 360 degrees.
• B. 270 degrees.
• C. 180 degrees.
• D. 90 degrees.
• E. 45 degrees.

25. A millivolt is:

• A. 103 V.
• B. 10-3 V.
• C. 106 V.
• D. 10-6 V.
• E. 10-9 V.

26. The reciprocal of reactance is called:

• A. Impedance.
• B. Conductance.
• C. Resistance.
• E. Susceptance.

27. Another name for joules per second is:

• A. Volts.
• B. Amperes.
• C. Ohms.
• D. Gilberts.
• E. Watts.

28. In a pure inductance:

• A. Current lags voltage by 90 degrees.
• B. Current lags voltage by less than 90 degrees.
• C. Current and voltage are in phase.
• D. Current leads voltage by 90 degrees.
• E. Current leads voltage by 180 degrees.

29. A form of microwave electron tube is:

• A. A cavity resonator.
• B. A triode.
• C. A Klystron.
• D. A cathode-ray tube.
• E. None of the above.

30. Magnetic lines of flux are generally:

• A. Parallel with the flow of electric current.
• B. In the plane of the electric current.
• C. At right angles to the flow of current.
• D. At a 45 degree angle to the flow of current.
• E. Impossible to predict as to their direction.

31. A class-A amplifier conducts during how much of the input cycle?

• A. Less than 90 degrees.
• B. 90–180 degrees.
• C. 180–270 degrees.
• D. 270–360 degrees.
• E. 360 degrees.

32. An advantage of parallel data transfer over serial transfer is:

• A. Higher speed.
• B. Narrower bandwidth.
• C. Lower frequency.
• D. Higher power.
• E. Better signal-to-noise ratio.

33. One way to keep interelectrode capacitance to a minimum is to:

• A. Use only electrolytic capacitors.
• B. Avoid the use of sheet metal.
• C. Use batteries as the source of power.
• D. Keep wire leads short.
• E. Use air-core transformers.

34. One advantage of ac (compared with dc) as a source of utility power is that:

• A. It can be used at safer voltage levels.
• B. It can be easily stepped up or down in voltage.
• C. There is lower transmission line loss.
• D. The waveshape can be varied easily.
• E. Higher voltages can be used.

35. An element of matter:

• A. Is a good conductor.
• B. Has a unique number of protons.
• C. Is an insulator.
• D. Makes a good electronic component.
• E. Can be fabricated onto an IC chip.

36. A transformer quadruples the ac voltage. The primary-to-secondary impedance ratio is therefore:

• A. 1:16.
• B. 1:4.
• C. 1:1.
• D. 4:1.
• E. 16:1.

37. Frequency multiplication is possible with a semiconductor diode because the diode is:

• A. Amplifying.
• B. Detecting.
• C. Forward-biased.
• D. Reverse-biased.
• E. Nonlinear.

38. An ammeter measures:

• A. Current.
• B. Voltage.
• C. Resistance.
• D. Power.
• E. Energy.

39. A good type of resistor to use in a radio amplifier is:

• A. Carbon composition.
• B. Wirewound.
• C. Silver mica.
• D. Reactive.
• E. Tantalum.

40. An advantage of machine vision over human vision is the fact that:

• A. Machines can see at wavelengths to which human eyes are blind.
• B. Machine vision systems have equal sensitivity at all wavelengths.
• C. Machine vision can measure pressure.
• D. Machine vision engineers need not take image resolution into account.
• E. Machine vision engineers need not take sensitivity into account.

41. A logic circuit has an output 0 when the input is 1, and vice versa. This is:

• A. A NOR gate.
• B. An AND gate.
• C. A NOT gate.
• D. An XOR gate.
• E. An XNOR gate.

42. A type of FM detector that has its limiter built in is:

• A. A balanced modulator.
• B. A beat-frequency oscillator.
• C. An envelope detector.
• D. A product detector.
• E. A ratio detector.

43. Which of the following materials is/are commonly used as a semiconductor?

• A. Silver-mica.
• B. Ferrite.
• C. Gallium arsenide.
• D. Tantalum.
• E. All of the above.

44. In an NPN bipolar transistor circuit:

• A. The dc collector voltage is negative.
• B. The output is taken from the base.
• C. The dc collector voltage is positive.
• D. The output is taken from the drain.
• E. Negative feedback must be used.

45. A simple power supply filter can be made using:

• A. A capacitor in parallel with the rectifier output.
• B. A resistor in parallel with the rectifier output.
• C. An inductor in parallel with the rectifier output.
• D. A capacitor in series with the rectifier output.
• E. A resistor in series with the rectifier output.

46. If an ac admittance contains finite, nonzero resistance and finite, nonzero susceptance:

• A. The impedance is a pure resistance.
• B. The impedance is zero.
• C. The resistance is zero.
• D. The impedance is complex.
• E. No. An ac admittance cannot contain susceptance.

47. Three resistances are in parallel, with values of 100, 200, and 300 ohms. The current through the 200-ohm resistor is 500 mA. What is the voltage across the whole combination?

• A. There isn’t enough information to figure it out.
• B. 400 V.
• C. 400 mV.
• D. 100 V.
• E. 100 mV.

48. As the frequency of ac increases, the reactance of an inductor:

• A. Remains constant.
• B. Becomes small positively.
• C. Becomes small negatively.
• D. Becomes large negatively.
• E. Becomes large positively.

49. The rate of change in a quantity is called the:

• A. Effective value.
• B. Instantaneous value.
• C. Average value.
• D. Peak value.
• E. Derivative.

50. The axis of the geomagnetic field:

• A. Corresponds exactly with the rotational axis.
• B. Is slanted with respect to the rotational axis.
• C. Is perpendicular to the rotational axis.
• D. Runs parallel to lines of latitude.
• E. Is circular in shape.

51. One of the main shortcomings of MOSFETs is that they:

• A. Are easily damaged by static electricity.
• B. Require high voltages.
• C. Consume large amounts of current.
• D. Have very low gain.
• E. Do not have good sensitivity.

52. Resistivity of wire can be specified in:

• A. Volts per ohm.
• B. Ohms per volt.
• C. Ohms per meter.
• D. Amperes per ohm.
• E. Ohms per ampere.

53. A complementary-metal-oxide-semiconductor (CMOS) IC:

• A. Employs diodes and NPN transistors on a single chip.
• B. Employs N-channel and P-channel FETs on a single chip.
• C. Uses two chips connected together in a special way.
• D. Uses resistors and PNP transistors on a single chip.
• E. Consists of metal oxide sandwiched between two layers of P-type material.

54. A piano sounds different than a saxophone, even if the notes are at the same frequency, because of a difference in:

• A. Bias.
• B. Waveform.
• C. Voltage.
• D. Current.
• E. The way you imagine it.

55. Inductances in parallel, assuming there is no mutual inductance, add up like:

• A. Resistances in series.
• B. Resistances in parallel.
• C. Capacitances in parallel.
• D. Batteries in parallel.
• E. No other type of electrical component.

56. A reactance modulator produces:

• A. CW.
• B. AM.
• C. SSB.
• D. FM.
• E. PCM.

57. Antenna efficiency is:

• A. Usually more important in transmitting systems than in receiving systems.
• B. The difference between the input and output power.
• C. A direct function of the noise in a transmitting system.
• D. The proportion of input power that gets converted into heat.
• E. Highest when the transmitter final amplifier is maximally efficient.

58. In a parallel-resonant LC circuit, the impedance is:

• A. Low and reactive.
• B. High and reactive.
• C. Low and resistive.
• D. High and resistive.
• E. Any of the above.

59. In a resistance/inductance (RL) series circuit:

• A. Current lags voltage by 180 degrees.
• B. Current lags voltage by 90 degrees.
• C. Current lags voltage by less than 90 degrees.
• D. Current and voltage are in phase.
• E. Current leads voltage by 90 degrees.

60. In three-phase ac, the difference in phase between any two waves is:

• A. 30 degrees.
• B. 45 degrees.
• C. 60 degrees.
• D. 90 degrees.
• E. 120 degrees.

61. Electrostatic forces can be measured to directly indicate:

• A. Power.
• B. Frequency.
• C. Current.
• D. Resistance.
• E. Voltage.

62. A circuit has a complex impedance of 9 + j12. The absolute-value impedance is:

• A. 15 ohms.
• B. 9 ohms.
• C. 12 ohms.
• D. 21 ohms.
• E. Impossible to calculate from this data.

63. Three resistors, each of 30 ohms, are connected in parallel. The net resistance is:

• A. 90 ohms.
• B. 60 ohms.
• C. 33 ohms.
• D. 10 ohms.
• E. Impossible to determine from the data given.

64. The logical statement X + Y = Y + X depicts:

• A. The distributive property.
• B. The associative property.
• C. The commutative property.
• D. The de Morgan theorem.
• E. The behavior of a NOR gate.

65. A cell that can be recharged, and therefore used again and again, is called:

• A. A secondary cell.
• B. A multiple-use cell.
• C. A primary cell.
• D. A tertiary cell.
• E. A battery.

66. A resistor has a positive temperature coefficient of 1.00 percent per degree C.If its value is 100 ohms at 20 degrees C, what is its value at 25 degrees C?

• A. 100 ohms.
• B. 105 ohms.
• C. 95 ohms.
• D. 125 ohms.
• E. It can’t be calculated from this data.

67. A memory that can be easily accessed, but not written over, is called:

• A. RAM.
• B. PRAM.
• C. CMOS.
• D. ROM.
• E. CROM.

68. The capacitance between two parallel sheets of metal is:

• A. Directly proportional to the distance between them.
• B. Inversely proportional to the distance between them.
• C. Not dependent on the distance between them.
• D. Inversely proportional to their surface area.
• E. Negligible unless the sheets are both gigantic.

69. The forward base bias in a transistor is increased until the collector current levels off. This condition is:

• A. Cutoff.
• B. Saturation.
• C. Pinchoff.
• D. Forward breakover.
• E. Avalanche.

70. An advantage of a LEO communications satellite system over a geostationary communications satellite is the fact that:

• A. The bandwidth is greater.
• B. The image resolution is superior.
• C. The satellites never change their position in the sky.
• D. Large, high-gain antennas are not required.
• E. The satellites orbit at higher altitudes.

71. A coil has 20 mH of inductance. What is the inductive reactance?

• A. 20 ohms.
• B. 0.05 ohms.
• C. 50 ohms.
• D. 20k ohms.
• E. There isn’t enough information given here to figure it out.

72. What is an advantage of digital signal processing (DSP)?

• A. Improved signal-to-noise ratio.
• B. Enhanced fidelity.
• C. Improved intelligibility.
• D. Relative immunity to atmospheric noise.
• E. All of the foregoing.

73. A dc voltage-divider network is made using:

• A. Inductors.
• B. Resistors.
• C. Capacitors.
• D. Bipolar transistors.
• E. FETs.

74. The electron volt is a unit of:

• A. Voltage.
• B. Current.
• C. Power.
• D. Electric field strength.
• E. Energy.

75. A transformer has a primary-to-secondary turns ratio of 10:1. The input is 120V rms ac. The output is:

• A. 12 kV rms ac.
• B. 1.2 kV rms ac.
• C. 120 V rms ac.
• D. 12 V rms ac.
• E. 1.2 V rms ac.

76. Wave X leads wave Y by 270 degrees. This would be better expressed by saying that:

• A. Wave X lags wave Y by 90 degrees.
• B. Wave X lags wave Y by 180 degrees.
• C. Wave X lags wave Y by 270 degrees.
• D. Waves X and Y are out of phase.
• E. Waves X and Y are in phase.

77. Which type of amplifier circuit has the transistor or FET biased exactly at cutoff or pinchoff when there is no signal input?

• A. Class-A.
• B. Class-AB.
• C. Class-B.
• D. Class-C.
• E. Class-D.

78. The term resolution might apply to:

• A. A hi-fi amplifier system.
• B. A power supply.
• C. A machine vision system.
• D. An NPN bipolar transistor.
• E. An electrolytic capacitor.

79. An audio oscillator that uses two amplifiers in cascade, with positive feedback from the output of the second stage to the input of the first stage, is known as a:

• A. Colpitts circuit.
• B. Hartley circuit.
• C. Multivibrator.
• D. VCO.
• E. Clapp circuit.

80. The main factor that limits the frequency at which a P-N junction will rectify is the:

• A. PIV rating.
• B. Junction capacitance.
• C. Junction resistance.
• D. Junction inductance.
• E. Reverse bias current.

81. The henry is a:

• A. Very small unit.
• B. Unit of capacitive reactance.
• C. Measure of transistor gain.
• D. Unit of phase.
• E. Very large unit.

82. A diode that can be used as a variable capacitance is a:

• A. GaAsFET.
• B. Silicon rectifier.
• C. Point-contact diode.
• D. Varactor.
• E. Germanium detector.

83. Elements can join together to form:

• A. Ions.
• B. Isotopes.
• C. Nuclei.
• D. Compounds.
• E. Majority carriers.

84. The rms value for an ac wave is also sometimes called the:

• A. Absolute value.
• B. Direct-current value.
• C. Effective value.
• D. Equivalent value.
• E. Reactive value.

85. The gigabyte is a unit commonly used as a measure of:

• A. Data access time.
• B. Data frequency.
• C. Data transfer speed.
• D. Data storage capacity.
• E. Data communications accuracy.

86. In a parallel combination of light bulbs, if one bulb socket totally shorts out:

• A. The circuit had better have a fuse or a circuit breaker.
• B. The other bulbs will burn out.
• C. The other bulbs will dim slightly, but stay lit.
• D. The current drawn from the source will decrease.
• E. None of the above.

87. A common lab multimeter cannot measure:

• A. Current.
• B. Frequency.
• C. Voltage.
• D. Resistance.
• E. It can measure any of the above.

88. In a P-channel JFET:

• A. The drain is positive with respect to the source.
• B. The gate must be grounded.
• C. The majority carriers are holes.
• D. The source receives the input signal.
• E. All of the above are true.

89. If you place a bar of iron inside a cylindrical coil of wire, and then run dc through the wire, you have:

• A. A rheostat.
• B. A permanent magnet.
• C. A flux meter.
• D. An electric generator.
• E. An electromagnet.

90. Admittance is a quantity expressing:

• A. Opposition to dc.
• B. Opposition to audio signals.
• C. Ease with which a circuit passes ac.
• D. The ratio of capacitance to inductance.
• E. The ratio of reactance to resistance.

91. In a common-emitter bipolar-transistor circuit:

• A. The collector is at signal ground.
• B. The output is taken from the base.
• C. The emitter is at signal ground.
• D. The bases of two transistors are connected together.
• E. The output is taken from the emitter.

92. In a certain resistance-capacitance (RC) circuit, the current leads the voltage by 45 degrees. The resistance is 50 ohms. The capacitive reactance is:

• A. 25 ohms.
• B. -25 ohms.
• C. 50 ohms.
• D. -50 ohms.
• E. Impossible to determine from this information.

93. The VA power is equal to the true power only when:

• A. A circuit has no resistance.
• B. A circuit has no impedance.
• C. A circuit has no reactance.
• D. The complex impedance is high.
• E. The phase angle is 45 degrees.

94. Binaural machine hearing can be advantageous over monaural machine hearing because the binaural scheme:

• A. Allows a robot to measure the frequency of a sound.
• B. Allows a robot to determine the amplitude of a sound.
• C. Allows a robot to tell from which direction a sound is coming.
• D. Allows a robot to ascertain the waveform of a sound.
• E. Allows a robot to interpret spoken commands.

95. The standard unit of inductance is the:

• B. Henry.
• C. Gilbert.
• D. Gauss.
• E. Tesla.

96. The output of an amplifier circuit is 20 V and the input is 5.0 V. The input and output impedances are identical. The circuit thus has a gain of:

• A. 4 dB.
• B. 6 dB.
• C. 12 dB.
• D. -4 dB.
• E. -6 dB.

97. An example of a device that converts electrical energy into visible radiant energy is:

• A. A photocell.
• B. A phototransistor.
• C. A photovoltaic cell.
• D. A light-emitting diode.
• E. A speaker.

98. What is the function of bleeder resistors in a power supply?

• A. To regulate the current.
• B. To regulate the voltage.
• C. To protect the rectifier diodes against electromagnetic interference.
• D. To protect the rectifier diodes against current surges.
• E. To discharge the filter capacitors after the supply is shut off.

99. A resistor of 100 ohms carries 333 mA dc. The power dissipated by that resistor is:

• A. 300 mW.
• B. 3.33 W.
• C. 33.3 W.
• D. 3.33 W.
• E. 11.1 W.

100. The data in nonvolatile memory:

• A. Is stored on magnetic disks.
• B. Consists of analog waveforms.
• C. Is retained after the power is removed.
• D. Must pass through a modem before it can be understood by the CPU.
• E. Cannot be used by a microprocessor.

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