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OEC > Closed Book 3 > Flashcards

Closed Book 3 Flashcards

1
Q

To control a ceiling light from five different locations it requires which of the following?

A) four 3way switches and one 4way switch
B) three 4way switches and two 3way switches
C) three 3way switches and two 4way switches
D) four 4way switches and one 3way switch

A

three 4way switches and two 3way switches

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2
Q

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

A

ease of voltage variation

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3
Q

Which of the following is considered the best electrical conductor?

A) iron wire
B) copper wire
C) aluminum wire
D) tin wire

A

copper wire

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4
Q

The liquid in a battery is called the _____.

A) askarel
B) festoon
C) hermetic
D) electrolyte

A

electrolyte

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5
Q

A color code is used in multiple-conductor cables. For a 3- conductor cable, the colors would be _____.

A) one black, one red, one white
B) two black one red
C) one white, one black and one blue
D) two red one black

A

one black, one red, one white

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6
Q

Explanatory material in the code is characterized by _____.

A) the word “shall”
B) FPN
C) the word “may”
D) the word “could”

A

FPN - informational note 90.5(C)

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7
Q

The identified grounded 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 the lamp
D) provide the easiest path to connect the wire

A

reduce the possibility of accidental shock

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8
Q

A _____ box may be weatherproof.

A) watertight
B) rainproof
C) raintight
D) all of these

A

all of these

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9
Q

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

A

currents would circulate through individual raceways

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10
Q

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

A

derating of ampacity

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11
Q

A ____ helps prevent arcing in movable contacts

A) spring
B) condenser
C) resistor
D) hydrometer

A

condenser

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12
Q

The _____ circuit is the portion of the wiring system prior to final overcurrent protective device protecting the circuit.

A) service
B) feeder
C) power
D) branch

A

feeder

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13
Q

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

A

the conductor will not turn off

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14
Q

Determining a positive wire on a single-phase circuit is _____.

A) possible with a wattmeter
B) possible with a voltmeter
C) possible with an ammeter
D) an impossibility

A

an impossibility

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15
Q

A _____ is used for testing specific gravity.

A) thermocouple
B) megger
C) hydrometer
D) galvanometer

A

hydrometer

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16
Q

An autotranformer 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

A

its primary and secondary windings are common to each other

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17
Q

In residential buildings, small appliance loads should have two or more _____.

A) 15 amp branch circuits
B) 20 amp branch circuits
C) 40 amp branch circuits
D) 50 amp branch circuits

A

20 amp branch circuits

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18
Q

If the end of a cartridge fuse becomes warmer than normal, you should _____.

A) tighten the fuse clip
B) lower the voltage on the circuit
C) notify the utility company
D) change the fuse

A

tighten the fuse clip

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19
Q

Which of the following is the poorest conductor of electricity?

A) mercury
B) aluminum
C) carbon
D) silver

A

carbon

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20
Q

The primary winding of a loaded step-down xfer has _____ compared to the secondary winding.

A)
B)
C)
D)

A
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21
Q

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

A

copper is a very good conductor of heat

22
Q

The sum of the voltage drop around a circuit is equal to the source voltage is _____.

A) kirchoffs law
B) ohms law
C) nevins theory
D) faradays law

A

kirchoffs law

23
Q

Piezoelectric is caused by crystals or binding _____.

A) chemical
B) battery
C) pressure
D) heat

A

pressure

24
Q

Heavy-duty lampholders include _____.

A) admedium lampholders rated at 660 watts
B) lampholders used on circuits larger than 20 amperes
C) lampholders rated at not less than 750 watts
D) all of the above

A

all of the above

25
Q

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

A

to protect the conductors from damage

26
Q

Discoloring of one end of a fuse indicates _____.

A) increased current
B) excessive voltage
C) low resistance
D) poor contact

A

poor contact

27
Q

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

A

the nuts must be removed frequently

28
Q

When resistors are connected in series, the total resistance is _____.

A) the sum of the individual resistances
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

A

the sum of the individual resistances

29
Q

If a 120 volt incandescent olight 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

A

shorter life of the bulb

30
Q

Laminations are used in transformers to prevent _____.

A) copper loss
B) weight
C) eddy current losses
D) counter EMF

A

eddy current losses

31
Q

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 yellow stripes

A

green or green with yellow stripes

32
Q

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) are less expensive
D) they glow in the dark

A

do not wear out as quickly

33
Q

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

A

Orange

34
Q

The code rule for maximum 90 degree bends in a conduit between boxes is four, the most likely reason for the total 360 degree limitations is _____.

A) it is unsafe
B) it makes pulling the conductors through the conduit too difficult
C) you can damage galvanized coating on the conduit
D) too many bends require extra wire to be pulled

A

it makes pulling the conductors through the conduit too difficult

35
Q

The correct word to define wiring which is not concealed is _____.

A) open
B) uncovered
C) exposed
D) bare

A

exposed

36
Q

A solenoid is a _____.

A) relay
B) permanent magnet
C) dynamo
D) electromagnet

A

electromagnet

37
Q

An electrician should always consider the circuit to be “hot” unless he definitely knows otherwise. The main reason is to avoid _____.

A) personal injury
B) having to find the panel
C) saving time
D) shutting off the wrong circuit

A

Personal injury

38
Q

The best thing to cut PVC conduit within a tight area is _____.

A) a short hacksaw
B) a nylon string
C) a knife
D) a pipe cutter

A

a nylon string

39
Q

If a live conductor is contacted accidentally, the severity of the electrical shock is determined primarily by _____.

A) the size of the conductor
B) whether the current is DC or AC
C) the current in the conductor
D) the contact resistance

A

the contact resistance

40
Q

Ohm’s law is _____.

A) an equation for determining power
B) the relationship between voltage, current and power
C) the relationship between voltage, current and resistance
D) a measurement of wattage losses

A

the relationship between voltage, current and resistance

41
Q

What is the normal taper on a standard conduit thread-cutting die?
A) 1/2” per foot
B) 1/4” per foot
C) 3/8” per foot
D) 3/4” per foot

A

3/4” per foot

42
Q

In an AC circuit the ratio of the power in watts to the total volt-amps is called the _____.

A) demand factor
B) power factor
C) turns-ratio
D) diversity factor

A

power factor

43
Q

A continuous load is where the maximum current is expected to continue for ____ hours or more

A) five
B) two
C) three
D) four

A

three

44
Q

Which of the following is probably open when you test Phase A and Phase B and get a low voltage reading, test Phase B and C get a normal reading and test Phase A and C get a low voltage reading?

A) Phase A
B) Phase B
C) Phase C
D) none of these

A

Phase A

45
Q

A ladder which is painted is a safety hazard mainly because the paint _____.

A) may conceal weak spots in the rails or rungs
B) is slippery after drying
C) causes the wood to crack more quickly
D) peels and the sharp edges of the paint may cut the hands

A

may conceal weak spots in the rungs or rails

46
Q

The chemical used as the agent in fire extinguishers to fight electrical fires is _____.

A) CO2
B) KoH
C) H20
D) Lo6

A

CO2

47
Q

A location classified as _____ may be temporarily subject to dampness and wetness

A) dry
B) damp
C) moist
D) wet

A

dry

48
Q

The average dry cell battery gives an approximate voltage of _____.

A) 1.5
B) 1.2
C) 1.7
D) 2.0

A

1.5

49
Q

The _____ circuit is that portion of a wiring system beyond the final overcurrent protection.

A) lighting
B) feeder
C) signal
D) branch

A

Branch

50
Q

Which of the following will NOT affect the resistance of a circuit?

A) length of the conductor
B) diameter of the conductor
C) insulation of the conductor
D) temperature

A

insulation of the conductor

OEC (5 decks)

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