Practice# 9

1. On smaller guages of wire, they are pencil-stripped to prevent _____.

(A) over stripping (B) loosening of the wire-nut
(C)nicks in the wire (D) other

2. Galvanized conduit is made of ________.

(A)iron (B) zinc (C) nickle (D) lead

3. The frame of a motor is ussually positively grounded to _________.

(A) protect against shock (B) removed the static currents
(C) provide 115 volts (D) protect from lightning

4. When wrapping a splice with both rubber and friction tape, the main purpose of the
friction tape is to _______.
(A) provide extra insulation
(B) build up the insulation to the minimum thickness required
(C) protect the rubber tape
(D) provide a waterproof seal

5. An electrician should not wear shoes that have sponge rubber soles while working
mainly because they ______.
(A) wear out too quickly
(B) are not waterproof
(C) are not insulated
(D) are easily punctured when stepping on a nail

6. The letters DPDT are used to identify a type of _______.

(A) insulation (B) fuse (C) motor (D) switch

7. The term "ampere-hours" is associated with ______.

(A) motors (B) transformers (C) electromagnets (D) storage batteries

8. Which of the following would improve the resistance to earth?

I. use multiple ground rods II. treat the soil III. lengthen the ground rod
(A) I only (B) II and III only (C) I and III only (D) I,II and III

9. A tap tool is a tool used to ______.

(A) cut external threads (B) remove broken bolts
(C) ream raceways (D) cut internal threads

10. When cutting a metal conduit with a hacksaw, the pressure applied to the hacksaw
should be on ______.
(A) the return stroke only (B) the forward stroke only
(C) both the forward and return stroke equally (D) none of these
11. When the term "10-32" in connection with machine screws commonly used in
lighting work, the number 32 refers to ______.
(A) screw length (B) screw thickness (C) diameter hole (D) threads per inch

12. To fasten a box to a terra cotta wall you would use _____.
(A) lag bolts (B) expansion bolts (C) wooden plugs (D) rawl plugs

13. The output winding of a transformer is called the ______.

(A) primary (B) output (C) secondary (D) both a & b

14. The flux commonly used for the soldering of electrical conductors is ______.
(A) zinc chloride (B) rosin (C) borax (D) none of these

15. A shunt is sometimes used to increase the range of an electrical measuring

instrument. The shunt is normally used when measuring ________.
(A) AC voltage (B) DC voltage (C) DC ampere (D) AC ampere

16. A battery operates on the principle of _____.

(A) photo emission (B) triboelectric effect
(C) electro chemistry (D) voltaic conductivity

17. When an electric current is forced through a wire that has considerable resistance,
the _____
I. ampacity will decrease II. voltage will drop III. wire will heat up
(a) III only (b) I and II only (c) II and III only (d)I and III only

18. The continuity of an electrical circuit can be determined in the field by the means of
____.
(a) an ammeter (b) wheatstone bridge (c) bell and battery (d) wattmeter
<C>19. A wattmeter is connected in ____ in the circuit.
(a) series (b) paralled (c) series-parallel (d) none of these

20. A shunt is used to measure ___-.

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

21. A rigid conduit connecting to an outlet box should have a ______.

(A) bushing and locknut on the outside
(B) bushing on the outside and a locknut on the inside
(C) locknut and bushing on the inside
(D) locknut on the outside and a bushing on the inside

22. I dentified, as used in the Code in refference to a conductor or terminals, means that
such a conductor or terminal is to be recognized as _______.
(A) grounded (B) bonded (C) colored (D) marked
23. A toaster will produce less heat on low voltage because____
(a) its total watt output decreases
((b) the current will decrease
(c) the resistance has not change (d) all of these

24. If the current flow through a conductor is increased, the magnetic field around the
conductor ____.

(a) is unchanged (b) becomes stronger (c) collapses (d) becomes weaker

25. Comparing a #6 conductor to a #10 conductor of equal lengths, the #6 will have
lower ____.
(a)cost (b) weight (c) resistance (d) strength

26. The definition 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 differential temperature

27. The primary reason for using a hacksaw blade with fine teeth rather than coarse
teeth when cutting large stranded conductors is ___-
(a) a coarse blade would overheat the conductor
(b) a coarse blade breaks too easily
(c)to avoid snagging or pulling strands
(d) a fine blade will bend easier

28. The standard residential service is a 3-wire, 240 volt single-phase system. The
maximum voltage to ground in this system would be____volts
(a)115 (b)120 (c)199 (d)208

29.When working on a motor, the electrician should___to prevent accidental starting of

the motor.
(a)remove the fuses (b)ground the motor
(c)shut off the switch (d)remove the belts

30. It is responsibility of the electrician to make sure his tools are in good condition
because ____.
(a)defective tools can cause accidents
(b)the boss may want to use them
(c)the company will pay for only one set o tools
(d)a good job requires perfect tools
31. Continually overloading a conductor is a poor practice because it causes____.
(a)the conductor to melt (b)the insulation to deteriorate
(c)the conductor to shrink (d) damage to the raceway

32. For better illumination you would___.

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

33. A junction box above a lay-in ceiling is considered___.

(a) concealed (b)accessible (c)readily accessible (d)recessed

34. Which of the following metals is most commonly used in the filament of a bulb?
(a)aluminum (b)mercury (c)tungsten (d)platinum

35. Electrical equipment can be defined as ___.

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

36. I two equal resistance conductors are connected in parallel, the resistance of the
conductors is equal to ____.
(a)the resistance of one conductor
(b)twice the resistance of one conductor
(c)one-half the resistance of one conductor
(d)the resistance of both conductors

37. Wire connection should encircle binding posts in the ____manner the nut turns to
tighten.
(a)opposite (b)same (c)reverse (d)different

38. The primary and secondary windings of a transformer always have ____.
(a)a common magnetic circuit
(b) the same size wire
(c)separate magnetic circuits
(d) the same number of turns

39. Which of the following is not the force which moves electrons?
(a)EMF (b)voltage (c)potential (d)current

40. A motor with a wide speed range is a____.

(a)DC motor (b)AC motor (c) synchronous motor (d)induction motor

41.The stator of an AC generator is another name for the ____.

(a)rotating portion (b)slip rings (c) stationary portion (d)housing
42. Where galvanized conduit is used, the main purpose of the galvanizing is to ____.
(a)slow down rust (b) provide better continuity
(c)provide better strength (d) provide a better surface for painting

43. To lubricate a motor sleeve bearing you would use___.

(a)grease (b)vaseline (c)oil (d)graphite

44. When soldering conductors, flux is used___.

(a)to heat the conductors quicker
(b)to keep the surfaces clean
(c)to prevent loss of heat
(d)to bond the conductors

45. ____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)all weather

46.The current used for charging storage batteries is ___.

(a)square-wave (b)direct (C)alternating (d)variable

47. You should close a knife switch firmly and rapidly as there will be less --__.
(a)likelihood of arcing (b)wear on th contacts
(c)danger of shock (D)energy used

48. If one complete cycle occurs in 1/30 of a second, the frequency is ____.
(a)30 hertz (b) 60 cycle (c)115 cycle (d)60 hertz

49. An instrument that measures electrical energy is called the ____.

(a)galvanometer (b) wattmeter (c)dynamometer (d) watthour meter

50. In electrical wiring, "wire nuts" are used to ___.

(a) connect wires to terminals (b) join wires and insulate the joint
(c)connect the electrode (d)tighten the panel studs

51.Which of the following would be the best metal for a magnet?

(a)steel (b)aluminum (c)lead (d)tin

52. An electrician may use a megger___.

(a)to determine the RPM of a motor
(b)to determine the output of a motor
(c)to check wattage
(d)to test a lighting circuit for a ground
53. The least important thing in soldering two conductors together is to ____.
(a)use plenty of solder (b)use sufficient heat
(c)clean the conductors (d)use the proper flux

54. The property of a circuit tending to prevent the flow of current and at the same time
causing energy to be converted into heat is referred to as ____.
(a)the inductance (b)the resistance (c)the capacitance (D)the reluctance

55. Rigid conduit is generally secured to outlet boxes by ___.

(a)beam clamps (b)locknuts and bushing (c)set screws (d)offsets

56. Which one of the following is not a safe practice when lifting heavy items?
(a)use the arm and leg muscles
(b)keep your back as upright as possible
(c)keep lifting a heavy object until you get help
(d)keep your feet spread apart

57. A thermocouple will transform___into electricity

(a)current (b)heat (c)work (d)watts

58.In a residence the wall switch controlling the ceiling light is usually___.
(a)connected across both lines
(b)a double pole switch
(c)connected in one line only
(d)a 4-way switch

59. A switch which opens automatically when the current exceeds a predetermined limit
would be called a____.
(a)limit switch (b)circuit breaker (C)DT disconnect (D)contactor

60.A wattmeter is a combination of which two of the following meters?

I. ammeter II. ohmeter III.phase meter IV. voltmeter V.power factor meter
(a)II and III (b)I andV (c)I and IV (d)II and V

61. Acid is not considered a good flux when soldering conductors because it ___.
(a)smells bad (b)is corrosive (c)in non-conductive (d)costs too much

62. If the spring tension on a cartridge fuse clip is weak, the result most likely would
be___.
(a)the fuse would blow immediately
(b)the fuse clips would become warm
(c)the voltage to the load would increase
(d)the supply voltage would increase
63. The branch circuit loads specified by the code for lighting and receptacles are
considered____.
(a)minimum loads (b)maximum loads (c)loads to be served (d)peak loads

64. The conductor with the highest insulation temperature rating is ___
(a)RH (b)TW (c)THWN (d) THHN

<A>65.After cutting a conduit, to remove the rough edges on both ends, the conduit
ends should be ____.
(a)reamed (b)filed (c)sanded (d)ground

66. To fasten a raceway to a solid concrete ceiling, you would use____.

(a)toggle bolts (b)expansion bolts (c)wooden plugs (d)rawl plugs

67. A commutator of a generator should be cleaned with which of the following?

(a)emery cloth (b)graphite (c)a smooth file (d)fine sandpaper

68. The advantage of AC over DC includes which of the following?

(a)better speed control (b)lower resistance at higher current
(c)ease of voltage variation (d)impedance is greater

69. Which of the following is considered the best electrical conductor?

(a)iron wire (b)copper wire (c)aluminum wire (d)tin wire

70. The liquid in a battery is called the ___.

(a)askarel (b)festoon (C)hermetic (d)electrolyte

71. Explanatory material in the code is characterized by ____.

(a)the word "shall" (b)FPN (c)the word "may" (d)the word "could"

72. The identified grouded conductor of a lighting circuit is always connected to the
screw of a light socket to___.
(a)reduce the possibility of accidental shock
(b)ground the light fixture
(c)improve the efficiency of thye lamp
(d)provide the easiest place to connect the wire

73. A ____box may be weatherproof

(a)waterteght (b)rainproof (c)raintight (d)all of these
74. The code requires that all AC phase conductors where used, the neutral and all
equipment grounding conductors be grouped together when using metal enclosures or
raceways. The principal reason for this is ____.
(a)currents would circulate through individual raceways
(b)less expensive to install a single raceway
(c)less labor hours for pulling wires in a single raceway
(d)conductors are easier to pull in a single raceway

75. Installing more than three current carrying conductors in the same conduit
requires___
(a)a larger conduit (b)high heat rated conductors
(c)derating of ampacity (d)continuous loading

76. A ___helps prevent arcing in movable contacts.

(a)spring (b)condenser (c)resistor (d)hydrometer

77. The ___circuit is that portion of a wiring system prior to the final overcurrent
protective device protecting the circuit
(a)service (b)feeder (c)power (D)branch

78. When tightening a screw on a terminal, the end of the conductor should wrap
around the screw in the same direction that you are turning the screw so that___.
(a) when you pull on the conductor it will tighten
(b)the screw will not become loose
(c)the conductor will act as a locking nut
(d)the conductor will not turn off

79. Determining a positive wire on a single-phase circuit is ___.

(a)possible with a wattmeter (b)possible with a volt meter
(c)possible with an ammeter (d)an impossibility

80.A ____is used for testing specific gravity

(a)thermocouple (b)megger (c)hydrometer (d)galvanometer

81. An autotransformer differs from other types of transformers in that___.

(a)its primary winding is always larger than its secondary winding
(b)it can be used only in automobiles
(c)its primary and secondary windings are common to each other
(d)it must be wound with heavier wire

82. Where the ___is likely to be high, asbestos insulation on the conductor would be a
good choice
(a)temperature (b)humidity (c)voltage (D)amperage
83. If the end of a cartridge fuse becomes warmer than normal, you should___.
(a)tighten the fuse clips
(b)lower the voltage on the circuit
(c)notify the utility company
(d)change the fuse

84. Which of the following is the poorest conductor of electricity?

(a)mercury (b)aluminum (c)carbon (d)silver

85. The primary winding of a loaded step-down transformer has___compared to the

secondary winding.
(a)lower voltage and current (B)higher voltage and current
(c)higher voltage and lower current (d)lower voltage and higher current

86. Copper is used for the tip of a soldering iron because___.

(a)copper will not melt (b)copper is a very good conductor of heat
(c)solder will not stick to other alloys (d)copper is less expensive

87.Piezoelectric is caused by crystals or binding___.

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

88.Heavy duty lampholders include-___.

(a)admedium lampholders rated at 660 watts
(b)lampholders used on circuits larger than 20 amperes
(c)lamp holders rated at not less than 750 watts
(d)all of the above

89. The reason for installing electrical conductors in a conduit is ___.

(a)to provide a ground
(b)to increase the ampacity of the conductors
(c)to protect the conductors from damage
(d)to avoid derating for continuous loading of conductors

90. Discoloring of one end of a fuse normally indicates___.

(a)increased current (b)excessive voltage (C)low resistance (d)poor contact

91. Wing nuts are useful on equipment where___.

(a)cotter pins are used (b)the nuts must be removed frequently
(c)a wrench cannot be used (d)screws cannot be used

92. When resistors are connected in series, the total resistance is ___.
(a)the sum of the individual resistance values
(b)the equivalent of the smallest resistance value
(c)the equivalent of the largest resistance value
(d)less than the value of the smallest resistance
93. If a 120 volt incandescent light bulb is operating at a voltage of 125 volts, the result
will be____
(a)it may be enough to blow a fuse
(b)the bulb won't be as bright
(c)shorter life of the bulb
(d)the wattage will be less than rated

94. Laminations are used in transformers to prevent___.

(a)copper loss (b)weight (c)eddy current loss (d)counter EMF

95. The code requires which of the following colors for the equipment grounding
conductor?
(a)white or gray (b)green or green with yellow stripes
(c)yellow (d)blue with a yellow stripe

96. Sometimes mercury toggle switches are used in place of a regular toggle switch
because they___
(a)are easier to connect (b)do not wear out as quickly
(c)aree less expensive (d)they glow in the dark

97. The assigned color for the high-leg conductor of a three-phase, 4- wire delta
secondary is ___
(a) red (b)black (C)blue (d)orange

98. The code rule for maximum 90 degree bends in a conduit between two boxes is
four, the most likely reason for the total 360 degree limitation is ___
(a) it is unsafe
(b)it makes pulling the conductors through the conduit too difficult
(c)you can damage the galvanized coating on the conduit
(d)too many bends require extra wire to be pulled

99. The correct word to define wiring which is not concealed is ___
(a)open (b)uncovered (c)exposed (d)bare

100. A solenoid is a ____

(a)relay (b)permanent magnet (c)dynamo (d)electromagnet