Practice# 3

1. A plug fuse contains a safety element composed of a piece of metal that has
a_____.
(A) low resistance and high melting point
(B) high melting point
(C) low resistance and low melting point
(D) low resistance

2. The definition of automatic is self-acting, operating by its own mechanism when

actuated by some impersonal influence such as______.
(A) a change in current strength (B) temperature
(C) mechanical configuration (D) all of these

3. DC voltage is reduced with a______.

(A) resistor (B) capacitor
(C) transformer (D) condenser

4. The cord on a heating iron would most likely have an insulation of_____.
(A) nylon (B) rubber (C) asbestos (D) cotton braid

5. If the clips on a cartridge fuse become hot, this is a good indication that__.

(A) that the fuse clips are too loose

(B) the voltage is too high
(C) the fuse clips are too tight
(D) the fuse rating is too high

6. A plastic bushing is considered a(n)_____.

(A) electrical device (B) mounting device
(C) fitting (D) insulated device

7. The current will lag the voltage when_______is resent in the circuit.
(A) capacitance (B) inductance
(C) reluctance (D) resistance

8. The voltage of a circuit is best defined as_____.

(A) the potential between two conductors
(B) the greatest difference of potential between two conductors
(C) the effective difference of potential between two conducors
(D) the average RMS difference of potential between any two conductors

9. The relationship of a transformer primary winding to the secondary winding is

expressed in________.
(A) wattage (B) volt-amps

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 (C) turns-ratio (D) amps

10. The maximum current a #12 THW copper conductor connected to a 20 amp circuit
breaker would ever carry under any condition could be ___amperes.
(a)16 (b)20 (c)25 (d) 5000 or more

11. The least important reason for using a steel measuring tape around electrical
equipment is ____.
(a)magnet effect
(b) danger of entanglement in rotating machinery
(c) shock hazard
(d) short circuit hazard

12.A megawatt is _____watts.

(a)100,100 (b)1000 (c)10,000 (d)1,000,000

13.The resistance in a circuit may be increased by ____.

(a)increasing the current flow
(b)increasing the EMF
(c)a loose connection
(d)decreasing the current flow

14. DPDT letters would be used to identify a ____.

(a) circuit breaker (b)type of insulation
(c)raceway (d)switch

15. An accessible conductor is ___.

(a)not permanently enclosed by a structure
(b)admitting close approach
(c)not guarded by locked doors, elevation or other methods
(d)being reached without use of a ladder

16.The unit of measure for electrical capacity is the ___.

(a)ohm (b)henry (c)farad (d)watt

17.For better illumination you would use ___

(a) random spacing of lights
(b)evenly spaced lights,higher ceilings
(c)even spacing,numerous lights
(d)cluster lights

18. On a multi-wire, three-wire branch-ciruit the maximum unbalanced load on the

neutral conductor at anytime would be when___.
(a)the neutral is disconnected
(b)both circuits are fully loaded
(c)one hot leg is shut off

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 (d)both circuits are off

19.How many 4-way switches are required to switch a light from three places ?
(a) one (b) two (c)three (d) four

20. ___may be connected ahead of the main service switch.

(a)nothing (b)lighting fixtures
(C)motors (D)lighting arresters

21.AC voltages may be increased or decreased by a ____.

(a)rectifier (b)motor (c)transformer (d)dynamo

22. The equipment used to measure and compare peak, average, and root-mean-
square values on an AC voltage curve is called a____.
(a)hydrometer (b)oscilloscope
(c)thermal couple (d)mandrel

23. Which of the following is the best conductor of electricity?

(a)iron (b)aluminum (c)tungsten (D)carbon

<A>24. Pure XL in a circuit will cause a ___degree lag of the ampere curve to the
voltage curve in an AC circuit
(a)90 (b)120 (c)180 (d) 240

25.With respect to the safety value of insulation on electrical tools, it can be correctly
stated that____.
(a)the insulation should not be used as the only protective measure
(b)the insulation provides very little protection
(c)the insulation provides complete safety to the user
(d)insulation is really not needed

26. A DC voltmeter can be used directly to measure which of the following?

(a)cycles per second
(b)power factor
(c)power
(d)polarity

27. A way of expressing the power factor is ___.

(a)angle theta (b)R/Z (c)sin theta (d)XL/Z

28. If the phase voltages are 120 degrees apart, the line voltages will be ____
degrees apart.
(a) 30
(b) 60
(c)90
(d)120

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29. Electrical current is measured in terms of_____.
(a) electrical pressure
(b)electrons passing a point per second
(c) watts
(d) ohms

30. A _____is used for testing specific gravity.

(a) galvanometer (b) mandrel
(c) calorimeter (d) hydrometer

31. IN the course of normal operation the instrument which will be least effective in
indicating that a generator may overheat because it is overloaded is _____.
(a) a stator thermocouple (b) a wattmeter
(c) a voltmeter (d) an ammeter

32. An outlet box should be fastened to a solid concrete wall by means of _____.
(a) toggle bolts (b) wood plugs
(c) lag bolts (d) expansion bolts

33. What would be the advantage of 240 volts rather than 120 volts on a load with the
same wattage?
(a) less power used (b) less voltage drop
(c) both (a) and (b) (d) neither (a) nor (b)

34. AC voltage of the system is not the _____voltage.

(a) EMF (b) effective (c) average (d) RMS

35. A multimeter is a combination of _____.

(a) ammeter, ohmmeter and wattmeter
(b) voltmeter, ohmmeter and ammeter
(c) voltmeter, ammeter and megger
(d)voltmeter, wattmeter and ammeter

36.Two 120 volt light bulbs connected in series across 240 volts will____.
(a) burn at full brightness
(b) burn at half-brightness
(c) burn out quickly
(d) flicker with the cycle

37. The conductor used to connect the grounded circuit of a wiring system to a
grounding electrode is the _____.
(a) grounded conductor (b) bonding jumper
(c) main bonding jumper (d) grounding conductor

38. Galvanized rigid conduit is made of _____.

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 (a) iron (b) zinc (c) lead (d) nickel

39. A soldering iron should not be heated to excess because it will usually ____
(a) ruin the tin on the surface of the tip
(b) burn the wooden handle
(c) short-circuit the iron
(d) anneal the copper tip

40.A pendant fixture is a___.

(a) hanging fixture (b) recessed fixture
(c) bracket fixture (d) none of these

41. _____means so constructed or protected that exposure to the weather will not
interfere with successful operation.
(a) weatherproof (b) weather-tight
(c) weather-resistant (d) weather-sealed

42. To reverse the rotation of a three-phase motor you would_____.

(a) turn it around
(b) reverse two of the four leads
(c) reverse any two the three leads
(d) reverse all leads

43. The disadvantage of AC compared to DC would be_____

(a) smaller conductors to transmit electrical energy
(b) reduced cost of transmission with high voltage transformers
(c) less copper required with AC at higher voltages
(d) cannot be used in electro-plating

44. XL, XC,and R each in its own branch-circuit will flow in ____directions
(a) one (b) two (c) three (d) none of these

45. In a highly inductive AC circuit, what device is used to correct the power factor
towards unity?
(a) resistor (b) inductor (c) capacitor (d) rectifier

46. IN other than residential calculations, an ordinary outlet shall be calculated at

____.
(a) 660va (b)746w (c) 2 amps (d) 180va

47. New brushes for a generator should be fitted to the commutator by using a
_____.
(a) bastard file (b) strip of emery cloth
(c) polishing stone (d) Strip of sandpaper

48. Wound rotor and squirrel cage are two types of ____motors

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 (a) synchronous (b) single-phase
(c) induction (d)three phase

49. A galvanometer is used to indicate____.

(a)voltage (b) current
(c) resistance (d) wattage

50. The sum of the voltage drop around a circuit is equal to the source voltage is
_____.
(a) kirchhoff's law (b) Ohm's law
(c) Watt's law (d) Nevin's theory

51. Ohm's Law states______.

(a) I is equal to E/R (b) E is Equal to R/I
(c)E is equal to I times R (d) none of these

52. A clamp-on ammeter will measure ____.

(a) voltage when clamped on a single conductor
(b) current when clamped on a multiconductor cabel
(c) accurately only when parallel to cable
(d) accurately only when clamped perpendicular to a conductor

53. The purpose of locknuts in making electrical connections on studs is to ______

(a) prevent the connection from loosening under vibration
(b) connect multiple conductors on the stud
(c) make the connection tamperproof
(d) avoid having to torque the studs

54. What winding of a current transformer will carry more current?

(a) primary (b) secondary
(c) interwinding (d) tertiary

55. The words " thermally protected " appearing on the nameplate of a motor indicates
that the motor is provided with a _____.
(a) switch (b) fuse (c)breaker (d)heat sensing element

<B>56. True power is always voltage times current_____.

(a) in an AC circuit
(b) in a DC circuit
(c)where frequency is constant
(d) regardless of whether capacitive reactance is in the circuit or not

57. Which of the following would have the least amount of resistance?
(a) semi-conductor (b) insulator
(c)resistor (d) conductor

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58. Grounding the metallic cover of flexible metal conduit and armored cable, is for
protection against____.
(a)shock or injury (b) lightning
(c)open field shorts (d) change of frequency

59.Which of the following breaks down rubber insulation?

(a) oil (b) acid (c) water (d) none of these

60. The opposite of resistance would be_____.

(a) resonance (b) reluctance
(c) reactance (d)conductance

61.Coductors, such as non-metallic cable, when run in the space between studs are
defined as _____.
(a)inaccessible (b) concealed
(c) enclosed (d)buried

62. A type of transformer that has only a single winding is called a _____transformer.
(a) tertiary (b)auto (c) isolation (d) saturate

63. The main reason that water should not be used to extinguish fires involving
electrical equipment is that water____.
(a)may transmit shock to the user
(b) is ineffective in extinguishing electrical fires
(c) may short out the equipment
(d) will ruin the electrical equipment

64. Which of the following grounding electrodes is the only one that shall be
supplemented by an additional electrode?
(a) metal underground water pipe
(b) ground ring
(c) building steel
(d) concrete-encased

65. In a multiple motor circuit there is feeder protection, branch-circuit protection and
motor protection. If the feeder protection trips, the fault would be expected to be in
_____.
(a) one of the motors
(b) one of the branch-circuits
(c)the feeder
(d) one of the starters

66. A branch-circuit that supplies a number of outlets for lighting and appliances is
known as a ____branch-circuit.
(a) general purpose (b) multi-purpose
(c) utility (d) none of these

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67. The advantage of AC over DC includes which of the following?
(a) better speed control
(b)lower resistance at high currents
(c)ease of voltage variation
(d) impedance is greater

68. When three light bulbs are wired in a single fixture, they are connected in ____.
(a) parallel (b) series
(c) series-parallel (d) none of these

69. A voltage of 2000 microvolts is the same as ____volts.

(a) 0.002 (b) 0.20 (c) 0.02 (d) 2,000

70. Class____locations are those that are hazardous because of the presence of
easily ignitible fibers or flyings.
(a) I (b) II (c) III (d) none of these

71. _____conductors shall be used for wiring on fixture chains.

(a) solid (b) bare (c) covered (d) stranded

72. The proper way to mount an instrument meter is to _____.

(a) use a template
(b) use the meter to mark you holes
(c) drill from the back
(d) drill from the front

73. Three conductors (phase A,B and neutral) run from a busway to a load center
should not be installed in three separate raceways because _____.
(a) you need room for future fill
(b) to avoid using a gutter
(c) of inductance
(d) its easier to pull the conductors

74.Solenoids are made of what type of magnets?

(a) reverse (b) permanent (c) electro (d) copper

75. To measure the RPM speed of a motor you would use a____.
(a) hydrometer (b) bolometer
(c) tachometer (d) odometer

76. Which of the following is not a factor in calculating the feeder conductor size?
(a)ambient temperature (b) branch-ciruit protection
(c) voltage drop (d) demand factors

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77. _____is a synthetic non-flammable insulating liquid, which when decomposed by
electrical arcs, involve non-flammable gases.
(a)prynol (b) askarel (c) electrolyte (d) hermetic

78. Voltage drop in a conductor is ____.

(a) the conductor resistance times the voltage
(b)a function of insulation
(c) part of the load voltage
(d) a percentage of the applied voltage

79. The ratio of the maximum demand of the system to the total connected load of the
system is called the ____of the system.
(a) connected load (b) nameplate
(c) demand factor (d) turns-ratio

80. Piezoelectric is caused by crystals or binding ____.

(a) heat (b) pressure (c) static (d) chemical

81. Since fuses are rated by amperes and voltage, a fuse will work on____
I.AC II. DC III any voltage level
(a) I only (b) II only (c) III only (d) either I or II

82. When three equal resistors are connected in parallel the toal resistance is ____.
(a) the sum of the three resistors
(b) one -half of the sum of the three resistors
(c) less than any one resistor
(d) grater than any two equal resistors

83. Light fixtures hung by chains should be wired so that the ___.
(a)chain is not grounded
(b) wires support the light
(c) wires do not support the light
(d) light is insulated from the chain

84. ____boxes may be weatherproof.

I. Rainproof II. Raintight III. Watertight
(a)I only (Fb) II only (c) III only (d) I,II and III

85. Conductor overheating can be caused by ___.

I. overloading
II. high ambient temperature
III. grouping of more than 3 current-carrying conductors without derating
(a) I only (b) II only
(c) II and III only (d) I,II or III

86. A switch or breaker should disconnect the grounded conductors of a circuit ____.

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 (a) only with an isolating switch
(b) before disconnecting the hot conductors
c) simultaniously as it disconnects the ungrounded conductors
(d) the grounded conductor can never be switched

87. The difinition of ambient temperature is ________.

(a) the temperature of the conductor
(b) the insulation rating of the conductor
(c) the temperature of the area surrounding the conductor
(d) the maximum heat the insulation can be used within

88. For voltage and current to be in phase____.

(a) voltage and current appear at their zero and peak values at the same
time
(b) the circuit impedance has only resistance
(c) neither a nor b
(d) both a and b

89. Which of the following instruments would you use to indicate the phase
relationship btween the voltage and the current of AC circuit?
(a) KWH meter (b) power factor meter
(c) manometer (d) growler

90. A ___conductor is one having one or more layers of non-conducting materials

that are not recognized as electrical insulation.
(a)wrapped (b)bare (c)covered (d) insulated

91. Electrical equipment can be define as ________.

I. fittings II. appliances III devices IV. fixtures
(a) I only (b) I and IV only (c) I,III and IV(d)I,II,III and IV

92. The definition of a dry location____.

(a)not normally subjected to dampness
( b)not normally subjected to wetness
(c) may be temporarily subjected to wetness
(d) all of the above

93. _____duty is a type of service where both the load and the time intervals may
have wide variations.
(a) continuous (Fb) periodic (c) intermittent (d) varying

94. An autotransformer is generally used rather than an isolation transformer_____.

(a) when cost is a factor
(b) where the ratio of transformation is low
(c) when you have several branch-circuits
(d) when safety is a factor

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95. A ___ overcurrent device is not designated to interrupt short-circuit current.
(a) inverse breaker (b) dual-element fuse (c) type S fuse (d) thermal cutout

96. If a test lamp lights when placed in series with a condenser and a suitable suorce
of DC, it is a good indication that a condenser is ____ if the light burns continuously.
(a) fully charged (b) short circuited
(c) open circuit (d) fully discharged

97. Impedance is measured in___.

(a) farads (b) henrys (c) ohms (d) coloumbs

98. The standard unit of electrical pressure is the _____.

(a) ampere (b) watt (c) volt (d) watt-hour

99.The common fuse depends on the principle that the ____.

(a) current flow develops heat
(b) overvoltage will expand the link
(c) increase of resistance will occur
(d)voltage develops heat

100.Electro-magnetic devices usually have a ____core.

(a) aluminum (b) soft iron (c) hard iron (d) hard steel

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