CDC 3E052C Volume 3. Electrical Systems

Question 1

2. (401) What should you use to move the victim or conductor away from a person connected to a live circuit if the power cannot be turned off?

A. Wet rope.
B. Bare hands.
C. Insulated object.
D. Galvanized conduit.

Answer 1

C. Insulated object.

Question 2

3. (402) If you cannot control a victim’s bleeding by direct pressure alone, you

A. apply a tourniquet.
B. put cold compresses over the wound.
C. use your belt to support the limb as you pinch the blood vessel.
D. apply pressure to the pressure points on the inside of the upper arm or inside the thigh.

Answer 2

D. apply pressure to the pressure points on the inside of the upper arm or inside the thigh.

Question 3

4. (402) What is the body’s natural attempt to keep oxygen-rich blood flowing to the most important organs, such as the brain, heart, and lungs?

A. Sweating.
B. Bleeding.
C. Shock.
D. Fever.

Answer 3

C. Shock.

Question 4

5. (402) What is the proper rate for rescue breathing?

A. One breath every 5 seconds.
B. One breath every 15 seconds.
C. Two breaths every 5 seconds.
D. Two breaths every 15 seconds.

Answer 4

A. One breath every 5 seconds.

Question 5

6. (403) Everything in the universe is made of what?

A. Matter.
B. Electrons.
C. Compounds.
D. Valence shells.

Answer 5

A. Matter.

Question 6

7. (403) What are two or more different elements that are chemically joined called?

A. Matter.
B. Proton.
C. Molecule.
D. Compound.

Answer 6

D. Compound.

Question 7

8. (403) What is the purest part of a substance that can be broken down and retain its properties as that element?

A. Element.
B. Nucleus.
C. Electron.
D. Compound.

Answer 7

A. Element.

Question 8

9. (403) What is the smallest form of an element?

a. Atom.
b. Proton.
c. Element.
d. Molecule.

Answer 8

a. Atom.

Question 9

10. (403) What is the outermost shell of an atom called?

a. Ringer shell.
b. Facade shell.
c. Valence shell.
d. Connection shell.

Answer 9

c. Valence shell.

Question 10

11. (403) How many electrons do conductors have in the valence shell?
    a. Between 1 to 3.
    b. 4.
    c. Between 5 and 8.
    d. 9 or more.

Answer 10

a. Between 1 to 3.

Question 11

12. (403) In contrast to good conductors, we consider substances that have how many free electrons to be insulators?

a. Between 1 and 3.
b. 4.
c. Between 5 to 8.
d. 9 or more.

Answer 11

c. Between 5 to 8.

Question 12

13. (403) Semiconductors are not good conductors or insulators and are made of substances that have how many free electrons?

a. Between 1 and 3.
b. 4.
c. Between 5 and 8.
d. 9 or more.

Answer 12

b. 4.

Question 13

14. (403) What causes heat, chemical change, shock, electrocution, and magnetism to occur?
    a. Electrical pressure.
    b. Increased workload.
    c. Movement of electrons.
    d. Decreased surface area.

Answer 13

c. Movement of electrons.

Question 14

15. (403) When it comes to resistance in a piece of wire, what does a smaller surface area cause?
    a. Increased power.
    b. Lower resistance.
    c. Decreased power.
    d. Higher resistance.

Answer 14

d. Higher resistance.

Question 15

16. (403) What type of voltage normally maintains the same magnitude, but may vary?
    a. Alternating current (AC).
    b. Direct current (DC).
    c. Apparent power.
    d. Reactive power.

Answer 15

b. Direct current (DC).

Question 16

17. (403) What electrical terms does Ohm’s Law describe a relationship of?
    a. Voltage, current, and power.
    b. Resistance, current, and power.
    c. Resistance, voltage, and power.
    d. Voltage, current, and resistance.

Answer 16

d. Voltage, current, and resistance.

Question 17

18. (403) What is the relationship of current based on Ohm’s Law?

a. Directly proportional to power and directly proportional to voltage.
b. Inversely proportional to power and directly proportional to resistance.
c. Directly proportional to voltage and inversely proportional to resistance.
d. Inversely proportional to voltage and inversely proportional to resistance.

Answer 17

c. Directly proportional to voltage and inversely proportional to resistance.

Question 18

19. (404) What, besides a battery, can provide a power source for a direct current (DC) circuit?
    a. Rectifier.
    b. Oscillator.
    c. Generator.
    d. Transformer.

Answer 18

a. Rectifier.

Question 19

20. (404) What device allows you to control a direct current (DC) circuit manually?
    a. Relay.
    b. Switch.
    c. Rectifier.
    d. Transformer.

Answer 19

b. Switch.

Question 20

21. (404) What is the biggest difference between using a circuit breaker and a fuse?
    a. You won’t need to replace a circuit breaker when it trips.
    b. The fuse is large and only mounts externally to the circuit.
    c. The circuit breaker is smaller and will fit onto a circuit board.
    d. You will need to replace the circuit breaker every time it trips.

Answer 20

a. You won’t need to replace a circuit breaker when it trips.

Question 21

22. (405) What is the characteristic for total current in a direct current (DC) series circuit?
    a. Equal throughout the circuit.
    b. Lower than the lowest current reading.
    c. Product of the individual current readings.
    d. Sum of all of the individual current readings.

Answer 21

a. Equal throughout the circuit.

Question 22

23. (405) What is the characteristic of the total resistance in a parallel circuit?
    a. Same throughout the circuit.
    b. Sum of the individual resistors in the circuit.
    c. Less than the resistance of the smallest resistor.
    d. Product of the individual resistors in the circuit.

Answer 22

c. Less than the resistance of the smallest resistor.

Question 23

24. (405) What type of direct current (DC) circuit has more than one path for current to flow but have at least one resistor that receives the total circuit current passing through it?

a. Series circuit.
b. Simple circuit.
c. Parallel circuit.
d. Series-parallel circuit.

Answer 23

d. Series-parallel circuit.

Question 24

25. (405) What is the characteristic for total power in a series parallel circuit?
    a. Product of the power at the individual resistors.
    b. Less than the lowest power value at a resistor.
    c. Sum of the power at each individual resistor.
    d. The same throughout the circuit.

Answer 24

c. Sum of the power at each individual resistor.

Question 25

26. (405) What type of circuit typically has a parallel circuit with one or more legs having series portions? a. Series circuit. b. Parallel circuit. c. Combination circuit. d. Series parallel circuit.

Answer 25

c. Combination circuit.

Question 26

27. (406) In an alternating current (AC) circuit, how many electrical degrees does it take to form a complete cycle? a. 90. b. 18. c. 270. d. 360.

Answer 26

d. 360.

Question 27

28. (406) What does the vertical line (up and down) on a sine wave graph represents? a. Magnitude. b. Direction. c. Distance. d. Time.

Answer 27

a. Magnitude.

Question 28

29. (406) When you hear about the frequency of electricity, what is the timeframe the number of complete cycles that occur in? a. 1 second. b. 10 seconds. c. 30 seconds. d. 1 minute.

Answer 28

a. 1 second.

Question 29

30. (406) How many peaks does each cycle have in an alternating current (AC) voltage signal? a. 1. b. 2. c. 3. d. 4.

Answer 29

b. 2.

Question 30

31. (406) What do we refer to the percentage of peak voltage it took to produce the same amount of work as a direct current (DC) circuit as? a. Effective value. b. Standard value. c. Average value. d. Peak value.

Answer 30

a. Effective value.

Question 31

32. (407) Since the resistance acts a little different in an alternating current (AC) circuit, what do we refer to the resistance in an AC circuit as, which is represented by the X? a. Reactance. b. Inductance. c. Opposition. d. Capacitance.

Answer 31

a. Reactance.

Question 32

33. (407) What is an example of a use for a variable resistor? a. Winding for an electrical motor. b. Rectifier for a battery charger. c. Dimmer switch for a light. d. Coil for a power supply.

Answer 32

c. Dimmer switch for a light.

Question 33

34. (407) What is the effect if an inductor uses an iron core compared to one that has an air core? a. Less inductance. b. More inductance. c. Less capacitance. d. More capacitance.

Answer 33

b. More inductance

Question 34

35. (407) What are transformers made up of? a. Two plates and dielectric. b. One coil of wire and a core. c. Two or more coils of wire and a core. d. A piece of P-type and a piece of N-type material.

Answer 34

c. Two or more coils of wire and a core.

Question 35

36. (407) If the secondary coil of a transformer has less coil turns, what does the transformer do to meet circuit needs? a. Steps the voltage level up. b. Steps the voltage level down. c. Maintains the voltage level the same. d. Isolates the circuit from other components.

Answer 35

b. Steps the voltage level down.

Question 36

38. (407) What type of transformer only uses a secondary coil? a. Potential transformer. b. Isolation transformer. c. Current transformers. d. Power transformer.

Answer 36

c. Current transformers.

Question 37

39. (407) Since most of the capacitors you will see have a rating much lower than one farad, what do we refer to these as, represented by μf? a. Microfarad. b. Megafarad. c. Minifarad. d. Milifarad.

Answer 37

a. Microfarad.

Question 38

40. (407) What do we call the power created by inductance or capacitance? a. Apparent power. b. Reactive power. c. Evident power. d. True power.

Answer 38

b. Reactive power.

Question 39

41. (407) What do we call the power you think you are providing from your power source if you look at your voltage and current? a. Apparent power. b. Reactive power. c. Evident power. d. True power.

Answer 39

a. Apparent power.

Question 40

42. (407) How many volt amp (VA) is one kilovolt-amps (kVA) equal to? a. 100 VA. b. 1,000 VA. c. 10,000 VA. d. 100,000 VA.

Answer 40

b. 1,000 VA.

Question 41

43. (407) What formula do we use to determine the power factor? a. Power factor = true power / reactive power b. Power factor = true power / apparent power c. Power factor = evident power / apparent power d. Power factor = reactive power / evident power

Answer 41

b. Power factor = true power / apparent power

Question 42

44. (408) What occurs when we add impurities to the crystalline structure? a. Doping. b. Stuffing. c. Infusing. d. Dressing.

Answer 42

a. Doping.

Question 43

45. (409) What characteristic does the construction make the diode have? a. Low resistance in one direction and a high resistance in the other. b. Low resistance in both directions. c. High resistance in both directions. d. No resistance in both directions.

Answer 43

a. Low resistance in one direction and a high resistance in the other.

Question 44

46. (409) How much resistance does a diode offer to the current flow when the power source connects in the forward bias direction? a. None. b. Low. c. Moderate. d. High.

Answer 44

b. Low.

Question 45

47. (409) What is the bias of a diode when we connect the positive terminal of the battery to the N- type material and the negative terminal of the battery to the P-type material? a. Forward. b. Cathode. c. Reverse. d. Anode.

Answer 45

c. Reverse.

Question 46

48. (409) What happen when the majority carriers move outward allowing the barrier voltage to increase? a. Decrease in the depletion region. b. Increase in the depletion region. c. Decrease in the forbidden band. d. Increase in the forbidden band.

Answer 46

b. Increase in the depletion region.

Question 47

49. (409) What do we call the transformer on a full wave rectifier that has three terminals instead of two? a. Tri-leg. b. Center tap. c. Multi output. d. Middle wired.

Answer 47

b. Center tap.

Question 48

50. (409) What is a distinguishing feature of a bridge rectifier? a. 1 diode. b. 2 diodes. c. 4 diodes. d. 6 doides.

Answer 48

c. 4 diodes.

Question 49

51. (409) What is a distinguishing feature of a three-phase bridge rectifier? a. 1 diode. b. 2 diodes. c. 4 diodes. d. 6 diodes.

Answer 49

d. 6 diodes.

Question 50

52. (410) Since a static charge can be a hazard, when is it more severe? a. Arid, hot weather. b. Dry, cold weather. c. Wet, cool weather. d. Humid, warm weather.

Answer 50

b. Dry, cold weather.

Question 51

53. (410) At what voltage can static charges ignite gasoline fumes? a. 1,500 volts. b. 3,000 volts. c. 5,000 volts. d. 10,000 volts.

Answer 51

a. 1,500 volts.

Question 52

54. (410) What size ground must equipment in hazardous areas have for static charges? a. 16 American wire gauge (AWG). b. 10 AWG. c. 1/0 AWG. d. 2/0 AWG.

Answer 52

c. 1/0 AWG.

Question 53

55. (411) What consist of buried wires joined together to form a network of squares? a. Ground rods. b. Ground plates. c. Grid electrodes. d. Aluminum water pipe.

Answer 53

c. Grid electrodes.

Question 54

56. (411) Before making a connection to a ground, what should you check for? a. Tightness of the connector. b. Presence of electric current. c. Depth the ground rods is driven. d. Type of material the soil is made of.

Answer 54

b. Presence of electric current.

Question 55

57. (412) What type of system does current Air Force directives pertaining to grounding systems specify 10,000 ohms maximum for? a. Static grounds. b. Weapon system grounds. c. Navigational system grounds. d. Communications system grounds.

Answer 55

a. Static grounds.

Question 56

58. (412) What type of grounding pertains to the interconnecting and connection to earth of all noncurrent-carrying metal parts of an electrical wiring system? a. Static. b. Equipment. c. Fuel systems. d. Communication.

Answer 56

b. Equipment.

Question 57

59. (412) The resistance of most electrical system grounds below 600 VAC should be a. 10 ohms or less. b. 25 ohms or less. c. 125 ohms or less. d. 500 ohms or less.

Answer 57

b. 25 ohms or less.

Question 58

60. (413) When grounding petroleum, oil, and lubricant (POL) tanks, use at least two grounding rods for tanks with a circumference of 200 feet or less. At what distance of the tank circumference would you add another ground rod? a. 25 feet. b. 50 feet. c. 100 feet. d. 250 feet.

Answer 58

c. 100 feet.

Question 59

61. (414) How often do liquid-fuel maintenance personnel inspect ground cables in tank car and tank truck unloading areas, fill stands, fuel-dispensing areas, piers, and wharves? a. Daily. b. Weekly. c. Monthly. d. Annually.

Answer 59

c. Monthly.

Question 60

62. (415) What can you use to measure both ground resistance and ground circuit continuity, but it’s practical only for measuring static grounds with an ohms value above several thousand ohms? a. Ammeter. b. Megohmmeter. c. Earth resistance tester. d. Multimeter’s ohmmeter.

Answer 60

d. Multimeter’s ohmmeter.

Question 61

63. (415) Which test instrument do we use for testing a ground? a. Ammeter. b. Multimeter. c. Megohmmeter. d. Earth resistance tester.

Answer 61

d. Earth resistance tester.

Question 62

64. (415) What method do we usually use when we need the resistance of single driven grounds? a. Auxiliary ground. b. Direct reference. c. Fall of potential. d. Straight line.

Answer 62

b. Direct reference.

Question 63

65. (416) The specific gravity of battery electrolyte changes a. .004 for every 10 degrees in temperature change. b. .008 for every 25 degrees in temperature change. c. .027 for every 5 degrees in temperature change. d. .125 for every 2 degrees in temperature change.

Answer 63

a. .004 for every 10 degrees in temperature change.

Question 64

66. (416) Visually check the electrolyte level in each cell of a battery. If the level is low, fill the cell to the proper level using a. tap water. b. sulfuric acid. c. distilled water. d. potassium acid.

Answer 64

c. distilled water.

Question 65

67. (417) Where does a magnet have the greatest amount of magnetism? a. In the center. b. At the north pole. c. At the south pole. d. At each end of the magnet.

Answer 65

d. At each end of the magnet.

Question 66

68. (417) What type of magnet does an alloy of aluminum, nickel, and cobalt make up? a. Temporary. b. Permanent. c. Residual. d. Electric.

Answer 66

b. Permanent.

Question 67

69. (417) At what point in the generation of alternating current (AC) does the greatest number of magnetic lines of force cut the conductor causing the voltage to peak? a. 45 degrees. b. 90 degrees. c. 180 degrees. d. 270 degrees.

Answer 67

b. 90 degrees.

Question 68

70. (418) What component has stationary field windings that provide the magnetic field to produce electricity? a. Exciter. b. Interpoles. c. Alternator. d. Field windings.

Answer 68

a. Exciter.

Question 69

71. (418) What alternator component offers a slight magnetic force that aligns the main magnetic field so it remains most effective? a. Rotor. b. Interpoles. c. Voltage regulator. d. Damping windings.

Answer 69

b. Interpoles.

Question 70

72. (418) What alternator component helps the generator maintain a stable voltage under varying load conditions? a. Rotor. b. Interpoles. c. Voltage regulator. d. Damping windings.

Answer 70

d. Damping windings.

Question 71

73. (418) What type of voltage regulator uses a soft iron core at the exciter to create the initial voltage in the alternator? a. Permanente magnetic. b. Residual magnetic. c. Manual flashing. d. Self-exciting.

Answer 71

d. Self-exciting.

Question 72

74. (419) What do most exciters use that retain residual magnetism? a. Galvanized cores. b. Soft iron cores. c. Mica cores. d. Air cores.

Answer 72

b. Soft iron cores.

Question 73

75. (419) What does a voltage regulator sense if it increases the current to the exciter field windings causing the magnetic field to get stronger? a. An increase in frequency. b. A drop in voltage level. c. An increase in load. d. A drop in current.

Answer 73

b. A drop in voltage level.

Question 74

76. (420) What type of alternator consists of a rotating magnetic field and a single set of stator coils? a. Wye. b. Delta. c. Three phase. d. Single phase.

Answer 74

d. Single phase.

Question 75

77. (420) Which alternator configuration has three legs that all connect in the middle? a. Wye. b. Beta. c. Delta. d. Gamma.

Answer 75

a. Wye.

Question 76

78. (420) How do we refer to the measurement of voltage between a phase and a neutral? a. Line voltage. b. Phase voltage. c. Output voltage. d. Winding voltage.

Answer 76

b. Phase voltage.

Question 77

79. (420) What alternator configuration has no neutral that is common to all three phases? a. Wye. b. Beta. c. Delta. d. Gamma.

Answer 77

c. Delta.

Question 78

80. (420) What type of alternator will you find connected to equipment of the industrial nature? a. Wye. b. Beta. c. Delta. d. Gamma.

Answer 78

c. Delta.

Question 79

81. (421) What does it indicate if a diode has a high-resistance in one direction and a low-resistance in the other direction? a. Open diode. b. Good diode. c. Shorted diode. d. Reversed diode.

Answer 79

b. Good diode.

Question 80

82. (421) What does it indicate if a diode has a low reading in both directions? a. Open diode. b. Good diode. c. Shorted diode. d. Reversed diode.

Answer 80

c. Shorted diode.

Question 81

83. (421) What does it indicate if a diode has an infinity reading in both directions? a. Open diode. b. Good diode. c. Shorted diode. d. Reversed diode.

Answer 81

a. Open diode.

Question 82

84. (421) What instrument is used to check the insulation resistance of an alternator? a. Multimeter. b. Megohmmeter. c. Clamp-on ammeter. d. Earth resistance tester.

Answer 82

b. Megohmmeter.

Question 83

85. (421) What do most manufacturers recommend as the preferred method to dry wet alternator windings? a. Air dry. b. Space heaters. c. Operate the alternator at low load. d. Circulating low direct current (DC) voltage from an external source.

Answer 83

b. Space heaters.

Question 84

86. (422) What are two classification of solder we use? | a. Metallic and non-metallic. b. Pliable and non-pliable. c. Rigid and flexible. d. Hard and soft.

Answer 84

d. Hard and soft.

Question 85

87. (422) What is the key to reliable soldering? a. Clarity. b. Low heat. c. High heat. d. Cleanliness.

Answer 85

d. Cleanliness.

Question 86

88. (422) After cleaning and dressing the soldering tip, heat it and tin it with what? a. Flux. b. Solder. c. Leather. d. Steel wool.

Answer 86

b. Solder.

Question 87

89. (423) What component is used with a voltmeter for a three-phase alternator to save money? a. Multi-tap transformers. b. Multiple pointers. c. Cheaper meters. d. Selector switch.

Answer 87

d. Selector switch.

Question 88

90. (423) What type of transformer is used for an alternating current (AC) ammeter to step down the amount of current from the alternator in a ratio of 80 to 1? a. Isolation transformer. b. Current transformers. c. Potential transformer. d. Center tap transformer.

Answer 88

b. Current transformers.

Question 89

91. (423) What meter indicates the true power load in an alternating current (AC) circuit? a. Ammeter. b. Voltmeter. c. Wattmeter. d. Power factor meter.

Answer 89

c. Wattmeter.

Question 90

92. (423) What meter shows the percentage of the generator’s apparent power used as true power by the resistive load? a. Ammeters. b. Voltmeters. c. Wattmeters. d. Power factor meter.

Answer 90

d. Power factor meter.

Question 91

93. (423) What will a capacitive load cause? | a. Current and voltage in phase. b. Current to lead voltage. c. Current to lag voltage. d. Will have no effect.

Answer 91

b. Current to lead voltage.

Question 92

94. (424) What should you inspect the vibration dampeners sometime used to mount a voltage regulator for? a. Cracking and deterioration. b. Security and discoloration. c. Lubrication and dry rot. d. Staining and wear.

Answer 92

a. Cracking and deterioration.

Question 93

95. (424) If we are soldering the diode’s wiring, what must you use so the heat doesn’t damage the diode? a. Heat sink. b. Cold solder. c. Cooling fan. d. Low temperature.

Answer 93

a. Heat sink.

Question 94

96. (424) What component typically secures the knob on a control panel? a. Glue. b. Setscrew. c. Lock washer. d. Securing clip.

Answer 94

b. Setscrew.

Question 95

97. (425) What is a relay’s only moving part? a. Coil. b. Plunger. c. Contacts. d. Armature.

Answer 95

d. Armature.

Question 96

98. (425) What type of relay is completely self-contained and has no moving parts? a. Capacitive. b. Solid state. c. Inductive. d. Isolation.

Answer 96

b. Solid state.

Question 97

99. (426) What does the closing assembly of a circuit breaker usually consist of? a. Arc chutes and a tripping coil. b. Advancing motor and distribution points. c. Closing coil or motor and a control switch. d. Closing transformer and adjustable resistors.

Answer 97

c. Closing coil or motor and a control switch.

Question 98

100. (426) What is a relay equipped with to align the coil and contact pins to the base? a. Keyway. b. Template. c. Pin diagram. d. Larger coil pins.

Answer 98

a. Keyway.

Question 99

101. (406) What do we refer to the percentage of peak voltage it took to produce the same amount of work as a direct current (DC) circuit as? a. Standard value. b. Average value. c. Peak value. d. Effective value.

Answer 99

d. Effective value.

Question 100

102. (403) What is the smallest form of an element? | a. Molecule. b. Element. c. Atom. d. Proton.

Answer 100

c. Atom.

Question 101

103. (415) What can you use to measure both ground resistance and ground circuit continuity, but it’s practical only for measuring static grounds with an ohms value above several thousand ohms? a. Megohmmeter. b. Ammeter. c. Earth resistance tester. d. Multimeter’s ohmmeter.

Answer 101

d. Multimeter’s ohmmeter.

Question 102

104. (403) In contrast to good conductors, we consider substance that have how many free electrons to be insulators? a. 4 b. Between 1 and 3. c. Between 5 to 8. d. 9 or more.

Answer 102

c. Between 5 to 8.

Question 103

105. (405) What is the characteristic for total power in a series parallel circuit? a. Product of the power at the individual resistors. b. Less than the lowest power value at a resistor. c. The same throughout the circuit. d. Sum of the power at each individual resistor.

Answer 103

d. Sum of the power at each individual resistor.

Question 104

106. (421) What does it indicate if a diode has an infinity reading in both directions? a. Shorted diode. b. Open diode. c. Good diode. d. Reverse diode.

Answer 104

b. Open diode.

Question 105

107. (417) At what point in the generation of alternating current (AC) does the greatest number of magnetic lines of force cut the conductor causing the voltage to peak? a. 270 degrees. b. 90 degrees. c. 180 degrees. d. 45 degrees.

Answer 105

b. 90 degrees.

Question 106

108. (407) What type of transformer only uses a secondary coil? a. Current transformers. b. Power transformer. c. Potential transformer. d. Isolation transformer.

Answer 106

a. Current transformers.

Question 107

109. (420) What type of alternator consists of a rotating magnetic field and a single set of stator coils? a. Three phase. b. Wye. c. Single phase. d. Delta.

Answer 107

c. Single phase.

Question 108

110. (405) What is the characteristic of the total resistance in a parallel circuit? a. Same throughout the circuit. b. Less than the resistance of the smallest resistor. c. Product of the individual resistors in the circuit. d. Sum of the individual resistors in the circuit.

Answer 108

b. Less than the resistance of the smallest resistor.

Question 109

111. (421) What does it indicate if a diode has a low reading in both directions? a. Good diode. b. Shorted diode. c. Reversed diode. d. Open diode.

Answer 109

b. Shorted diode.

Question 110

112. (402) What is the proper rate for rescue breathing? a. Two breaths every 5 seconds. b. One breath every 15 seconds. c. One breath every 5 seconds. d. Two breaths every 15 seconds.

Answer 110

c. One breath every 5 seconds.

Question 111

113. (409) What is a distinguishing feature of a three-phase bridge rectifier? a. 6 diodes. b. 1 diode. c. 4 diodes. d. 2 diodes.

Answer 111

a. 6 diodes.

Question 112

114. (401) What is the minimum amount of current that can kill you? a. One tenth of an amp (0.1 A or 100 mA). b. One amp (1 A or 100 mA). c. One hundredth of an amp (0.01 A or 10 mA). d. One thousandths of an amp (0.001 A or 1 mA).

Answer 112

a. One tenth of an amp (0.1 A or 100 mA).

Question 113

115. (417) What type of magnet does an alloy of aluminum, nickel, and cobalt make up? a. Residual. b. Electric. c. Permanent. d. Temporary.

Answer 113

c. Permanent.

Question 114

116. (423) What type of transformer is used for an alternating current (AC) ammeter to step down the amount of current from the alternator in a ratio of 80 to 1? a. Isolation transformer. b. Potential transformer. c. Center tap transformer. d. Current transformers.

Answer 114

d. Current transformers.

Question 115

117. (421) What does it indicate if a diode has a high-resistance in one direction and a low-resistance in the other direction? a. Open diode. b. Shorted diode. c. Good diode. d. Reversed diode.

Answer 115

c. Good diode.

Question 116

118. (409) What characteristic does the construction make the diode have? a. Low resistance in both directions. b. No resistance in both directions. c. Low resistance in one direction and a high resistance in the other. d. High resistance in both directions.

Answer 116

c. Low resistance in one direction and a high resistance in the other.

Question 117

119. (414) How often do liquid-fuel maintenance personnel inspect ground cables in tank car and tank truck unloading areas, fill stands, fuel-dispensing areas, piers, and wharves? a. Daily. b. Annually. c. Monthly. d. Weekly.

Answer 117

c. Monthly.

Question 118

120. (406) When you hear about the frequency of electricity, what is the timeframe the number of complete cycles that occur in? a. 10 seconds. b. 30 seconds. c. 1 second. d. 1 minute.

Answer 118

c. 1 second.

Question 119

121. (415) What method do we usually use when we need the resistance of single driven grounds? a. Direct reference. b. Fall of potential. c. Auxiliary ground. d. Straight line.

Answer 119

a. Direct reference.

Question 120

122. (409) What is the bias of a diode when we connect the positive terminal of the battery to the N- type material and the negative terminal of the battery to the P-type material? a. Reverse. b. Cathode. c. Anode. d. Forward.

Answer 120

a. Reverse.

Question 121

123. (422) What are two classification of solder we use? | a. Metallic and non-metallic. b. Hard and soft. c. Rigid and flexible. d. Pliable and non-pliable.

Answer 121

b. Hard and soft.

Question 122

124. (425) What type of relay is completely self-contained and has no moving parts? a. Isolation. b. Capacitive. c. Solid state. d. Inductive.

Answer 122

c. Solid state.

Question 123

125. (418) What alternator component offers a slight magnetic force that aligns the main magnetic field so it remains most effective? a. Damping windings. b. Voltage regulator. c. Rotor. d. Interpoles.

Answer 123

d. Interpoles.

Question 124

126. (409) What happens when the majority carriers move outward allowing the barrier voltage to increase? a. Decrease in the forbidden band. b. Decrease in the depletion region. c. Increase in the forbidden band. d. Increase in the depletion region.

Answer 124

d. Increase in the depletion region.

Question 125

127. (403) When it comes to resistance in a piece of wire, what does a smaller surface area cause? a. Decreased power. b. Lower resistance. c. Increased power. d. Higher resistance.

Answer 125

d. Higher resistance.

Question 126

128. (407) If the secondary coil of a transformer has more coil turns, what does the transformer do to meet circuit needs? a. Isolates the circuit from other components. b. Maintains the voltage level the same. c. Steps the voltage level up. d. Steps the voltage level down.

Answer 126

c. Steps the voltage level up.

Question 127

129. (403) What is the outermost shell of an atom called? | a. Façade shell. b. Valence shell. c. Connection shell. d. Ringer shell.

Answer 127

b. Valence shell.

Question 128

130. (405) What type of circuit typically has a parallel circuit with one or more legs having series portions? a. Parallel circuit. b. Combination circuit. c. Series circuit. d. Series parallel circuit.

Answer 128

b. Combination circuit.

Question 129

131. (420) What alternator configuration has no neutral that is common to all three phases? a. Delta. b. Gamma. c. Wye. d. Beta.

Answer 129

a. Delta.

Question 130

132. (424) What component typically secures the knob on a control panel? a. Setscrew. b. Lock washer. c. Securing clip. d. Glue.

Answer 130

a. Setscrew.

Question 131

133. (403) What causes heat, chemical change, shock, electrocution, and magnetism to occur? a. Movement of electrons. b. Decreased surface area. c. Increased workload. d. Electrical pressure.

Answer 131

a. Movement of electrons.

Question 132

134. (403) What type of voltage normally maintains the same magnitude, but may vary? a. Apparent power. b. Alternating current (AC). c. Direct current (DC). d. Reactive power.

Answer 132

c. Direct current (DC).

Question 133

135. (412) What type of grounding pertains to the interconnecting and connection to earth of all noncurrent-carrying metal parts of an electrical wiring system? a. Equipment. b. Communication. c. Static. d. Fuel system.

Answer 133

a. Equipment.

Question 134

136. (406) What does the vertical line (up and down) on a sine wave graph represent? a. Magnitude. b. Distance. c. Direction. d. Time.

Answer 134

a. Magnitude.

Question 135

137. (416) The specific gravity of battery electrolyte changes? a. .008 for every 25 degrees in temperature change. b. .004 for every 10 degrees in temperature change. c. .125 for every 2 degrees in temperature change. d. .027 for every 5 degrees in temperature change.

Answer 135

b. .004 for every 10 degrees in temperature change.

Question 136

138. (407) What do we call the power you think you are providing from your power source if you look at your voltage and current? a. Reactive power. b. Apparent power. c. True power. d. Evident power.

Answer 136

b. Apparent power.

Question 137

139. (424) If we are soldering the diode’s wiring, what must you use so the heat doesn’t damage the diode? a. Cold solder. b. Cooling fan. c. Low temperature. d. Heat sink.

Answer 137

d. Heat sink.

Question 138

140. (420) What type of alternator will you find connected to equipment of the industrial nature? a. Beta. b. Gamma. c. Wye. d. Delta.

Answer 138

d. Delta.

Question 139

141. (421) What instrument is used to check the insulation resistance of an alternator? a. Earth resistance tester. b. Megohmmeter. c. Multimeter. d. Clamp-on ammeter.

Answer 139

b. Megohmmeter.

Question 140

142. (406) How many peaks does each cycle have in an alternating current (AC) voltage signal? a. 2. b. 3. c. 1. d. 4.

Answer 140

a. 2.

Question 141

143. (404) What device allows you to control a direct current (DC) circuit manually? a. Switch. b. Rectifier. c. Relay. d. Transformer.

Answer 141

a. Switch.

Question 142

144. (401) What should you use to move the victim or conductor away from a person connected to a live circuit if the power cannot be turned off? a. Insulated object. b. Wet rope. c. Galvanized conductor. d. Bare hands.

Answer 142

a. Insulated object.

Question 143

145. (423) What will a capacitive load cause? | a. Current and voltage in phase. b. Current to lag voltage. c. Will have no effect. d. Current to lead voltage.

Answer 143

d. Current to lead voltage.

Question 144

146. (403) What is the relationship of current based on Ohm’s Law? a. Directly proportional to voltage and inversely proportional to resistance. b. Inversely proportional to voltage and inversely proportional to resistance. c. Inversely proportional to power and directly proportional to resistance. d. Directly proportional to power and directly proportional to voltage.

Answer 144

a. Directly proportional to voltage and inversely proportional to resistance.

Question 145

147. (407) What is an example of a use for a variable resistor? a. Rectifier for a battery charger. b. Dimmer switch for a light. c. Winding for an electrical motor. d. Coil for a power supply.

Answer 145

b. Dimmer switch for a light.

Question 146

148. (415) Which test instrument do we use for testing a ground? a. Megohmmeter. b. Ammeter. c. Earth resistance tester. d. Multimeter.

Answer 146

c. Earth resistance tester.

Question 147

149. (405) What type of direct current (DC) circuit has more than one path for current to flow but have at least one resistor that receives the total circuit current passing through it? a. Series circuit. b. Parallel circuit. c. Simple circuit. d. Series-parallel circuit.

Answer 147

d. Series-parallel circuit.

Question 148

150. (403) How many electrons do conductors have in the valence shell? a. 4. b. Between 5 and 8. c. Between 1 to 3. d. 9 or more.

Answer 148

c. Between 1 to 3.

Question 149

151. (420) Which alternator configuration has three legs that all connect in the middle? a. Gamma. b. Wye. c. Delta. d. Beta.

Answer 149

b. Wye.

Question 150

1. (401) What is the minimum amount of current that can kill you? A. One thousandths of an amp (0.001 A or 1 mA). B. One hundredth of an amp (0.01 A or 10 mA). C. One tenth of an amp (0.1 A or 100 mA). D. One amp (1 A or 1000 mA).

Answer 150

C. One tenth of an amp (0.1 A or 100 mA).