MASTER ELECTRICIAN PREP EXAM PART 1

1. Frequency is measured in which of the following:

2. For electroplating power, which of the following generators should be used?

3. Power factor is equal to which of the following:

4. The combined opposition to current by resistance and reactance is which of the following:

5. In a generator, voltage is produced by which of the following conditions:

6. A capacitor performs which of the following functions:

7. Where the current flow through a conductor is greatest will be the point where the voltage drop is the lowest.

8. Of all of the materials used for insulation, which of the following has the highest electrical breakdown strength and the longest life:

9. What does it cost per year (at 8 cents per kWh) for the power loss of a 12 AWG circuit conductor (100ft long) that has a total resistance of 0.40 ohms and current flow of 16A?

10. A three horse power motor is equivalent to which of the following in watts:

11. Illumination is measured in which of the following units:

12. Some copper conductors are tinned to help prevent chemical reaction:

13. Which of the following should be tested to check for voltage to ground?

14. During one complete rotation of 360 degrees, a three-phase 6-pole AC 34 kVA alternator on a Y- connected system will have how many cycles:

15. Which of the following terms is used to describe the inductive action, which causes current to flow on the outer surface of a conductor:

16. The wattage  rating of a resistor determines its ability to absorb heat.

17. A wiring system has two lengths of wires, where wire A has a resistance of 10 ohms and wire B is three times the length of wire A with two times the cross-sectional area, which means that resistance of wire B is equal to which of the following:

18. The circuit conductors between service equipment and the final branch circuit overcurrent device are considered to be which of the following:

19. The sum of series voltage drops equals the applied voltage.

20. If a transformer ratio is 20/1,  then which of the following is true:

21. When a switch on a 110 amp system is closed, the total resistance of the switch is equal to which of the following:

22. If a series circuit has unequal resistances throughout the circuit, then which of the following is true:

23. When reduced to the most nominal component, the smallest element of matter is which of the following:

24. The armature reaction in an alternator is magnetizing at lagging loads.

25. A wire secured at one end with the other end fastened to a pole under tension is known as which of the following:

26. Which of the following is characteristic of inductance?

27. Magnetic lines of force are also known as which of the following:

28. Electric motors operate on the principal of induction and repulsion.

29. In applications where high starting torque is required, DC series motors are generally used.

30. If a motor enclosure is designed to contain sparks or flashes that could ignite surrounding vapors or gases, then the enclosure is considered to be which of the following:

31. The output of a 3-phase transformer is measured in which of the following units:

32. In order to change the rotation of a DC series motor, which of the following must be done:

33. Bonding does which of the following:

34. A meter used to measure both AC and DC voltage and current is known as which of the following:

35. Which of the following materials is used on conduits inside and outside of a box:

36. In a coil, the higher the level of self-inductance:

37. A negative charge will do which of the following:

1. I.    Interact with negative charges
2. II.   Interact with positive charges
3. III. Cause a short in a positive system

38. If a circuit breaker is installed vertically and the handle is flipped up, then the circuit breaker will be which of the following:

39. A dielectric electrical element is which of the following:

40. The electrical property of conductors that allows them to oppose the free flow of current traveling over them is measured in which of the following:

41. Two equally valued resistors in series have a total resistance of which of the following:

42. An eddy current can cause which of the following:

43. In a transformer, the side with more turns is which of the following:

44. In order to adjust the voltage of a constant speed DC generator, the field voltage must be changed.

45. The most power lost in the form of heat would come from which of the following:

46. Two transmission wires create a corona when which of the following exists:

47. Inductance and capacitance are not considerations in a DC current for which of the following reasons:

48. Rearranging  the control components in an electrical diagram in order to simplify tracing of a circuit is an example of a schematic diagram.

49. If a transformer has a voltage step-down from 117 volts to 6 volts then the ratio of the transformer is equal to which of the following:

50. If the power factor of a circuit is increased, then which of the following occurs:

51. In a 3Ø circuit, how many electrical degrees separate each phase:

52. Ground fault protection for personnel on a 120 volt single-phase circuit is based on which of the following:

53. Electrical appliances shall be installed in parallel in order to make the operation of each appliance in- dependent of the others.

54. In order to calculate watt hours, which of the following formulas must be used:

55. The peak value of AC voltage determines the breakdown voltage of insulation.

56. The efficiency of electrical equipment is determined by which of the following:

57. Which of the following is not applicable to an AC system?

58. In order to correct a low power factor, which of the following should be checked first:

59. Which of the following is used to control speed in a DC motor?

60. In order to connect an ammeter in series, the circuit must be opened at the voltage source and connected to the meter at the other end.

61. In an alternator, frequency is determined by which of the following:

62. In a transformer, the voltage per turn in the primary relates to the voltage per turn in the secondary in which of the following ways:

63. In a lamp holder, which of the following is true of the grounded conductor?

64. An electrical lighting timer switch is generally connected in parallel with the lighting

65. Bonding safely conducts any fault currents which may arise.

66. If a two-wire 120 volt circuit has one grounded conductor and supplies a single-phase 5 horsepower motor, then the required number of overloads is which of the following:

67. Conductors are materials that can be charged by rubbing them against other wires.

68. An incandescent lamp filament is made of nickel.

69. Which of the following conductor types is both moisture and heat resistant?

70. Electromagnetic induction involves a substance becoming a magnet when it is placed next to another magnet.

71. A metal halide lamp is also referred to as a quartz lamp.

72. Lamp holders installed in damp or wet locations shall be which of the following:

73. In an open circuit the resistance is equal to which of the following:

74. A resistor’s ability to absorb heat is gauged in which of the following units:

75. The power factor for a single-phase 50 amp 100 volt electric motor that draws 25 watts is which of the following:

76. Based on Ohm’s law, the voltage of a system is equal to which of the following:

77. The rate of flow of the electrical charges through a conductor is which of the following:

78. According the Kirchhoff’s current law, electrical current will do which of the following in Parallel circuits:

79. Watts are equal to which of the following:

80. The amperage of a three-phase system can be calculated as which of the following:

81. A centimeter is equal to which of the following:

82. Efficiency is calculated as output divided by input.

83. Circuits that are run in series:

84. Fahrenheit temperature is converted from Centigrade by using which of the following Equations:

85. The temperature of the area surrounding a conductor is known as the ambient temperature.

86. Arcing is defined as a luminous discharge of electricity across an insulating medium. Electric arcs operate at temperatures                      between and expel small particles of very hot molten materials.

87. A motor that draws 4.5 kilowatts from the power line and delivers 5 horsepower has an efficiency equal to which of the following:

88. Based on the figure below, the voltage across the 5 amp load after the neutral is opened,if both loads have resistance and the power factor is 1.0, would be which of the following:

89. Lightning protection is intended to protect the building structure itself, as well as the electrical equipment on or inside the building structure.

90. A balanced 3-wire, 120/240V, single-phase circuit is connected so that the ungrounded conductors are from different transformer phases (Line 1 and Line 2). The current on the grounded conductor will be                              of the ungrounded conductor current.

91. Because of conductor resistance, flux leakage, eddy currents, and hysteresis losses, not all of the input power is transferred to the secondary winding for useful purposes.

92. What is the power consumed by a 10 kW heat strip rated 230V connected to a 115V circuit?

93. What is the approximate power consumed by a 10 kW heat strip rated 230V, when connected to a 208V circuit?

94. What is the nameplate FLA for a 20 hp, 208V, three-phase motor with 90 percent power factor and 80 percent efficiency?

95. What size transformer is required for a 100A, 240V, single-phase noncontinuous load that has a power factor of 85 percent?

96. Three-phase,                            , wye-connected systems can overheat because of circulating odd triplen harmonic currents.

97. If there are three resistors in a series circuit, labeled R1, R2, and R3, with a total power used of 225 watts, and the individual power used by R2 is 75 watts and by R3 is 100 watts,then the power used by resistor R1 is which of the following:

98. In a 100 volt circuit with a resistance of 25 ohms, the current flowing through the circuit is which of the following:

99. Three parallel circuits with a voltage of 150 volts each produce a total current of which of the following:

100. What is the conductor power loss in watts for a 120V circuit that has a 3% voltage drop and carries a current flow of 12A?