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IBEW 4th Term > Week 5 homework > Flashcards

Week 5 homework Flashcards

1
Q

Generators are electromechanical devices that turn ? energy into ? energy.
Select one:
a.electrical / mechanical
b.kinetic / potential
c.mechanical / electrical
d.potential / heat

A

C mechanical / electrical

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2
Q

The source for mechanical motion supplied to a generator is referred to as the ? .
Select one:
a.driver
b.engine
c.originator
d.prime mover

A

d.
prime mover

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3
Q

In order to induce electrical energy into a conductor or generator, what three factors must be present?

I. Conductor
II. Heat
III. Magnetic field
IV. Relative motion
V. Rotation
Select one:
a.I., II., and III.
b.I., III., and IV.
c.I., III., and V.
d.II., III., and V.

A

b.
I., III., and IV.

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4
Q

Match the correct part of the alternator with the corresponding letter. (couldn’t enter diagram here) question 4 of acth lvl III lesson 5

A

Armature windings or loops
Answer 1 Brush
Answer 2 Magnetic field poles
Answer 3 Slip ring
Answer 4

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5
Q

When using the Fleming left hand rule for generators, the thumb indicates the direction of thrust, the forefinger indicates the direction of field flux from N to S, and the center finger indicates the direction of induced current.

True or false

A

True

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6
Q

If there is an external circuit for current to flow, electron current will flow from the ? to the ? terminal in the circuit.
a.load / source
b.negative / positive
c.positive / negative
d.source / load

A

b.
negative / positive

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7
Q

The rotating armature of an AC generator is connected to its external circuit through ? while a DC generator uses a(n) ? to make the connection.
Select one:
a.brushes / rotor
b.commutators / slip ring
c.rotors / brush
d.slip rings / commutator

A

d.
slip rings / commutator

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8
Q

The winding in a generator where voltage is induced is called the ? .
Select one:
a.armature
b.commutator
c.exciter
d.slip ring

A

a.
armature

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9
Q

A single coil generator spinning in a magnetic field will produce a full sine wave for every ? of rotation.
Select one:
a.90°
b.180°
c.360°
d.720°

A

c.
360°

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10
Q

The measure of how frequently a generator produces a sine wave is called the ? of the waveform.
Select one:
a.cycles
b.frequency
c.hertz
d.period

A

b.
frequency

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11
Q

AC generators can be constructed in two basic styles and can be described as a ? type or a ? type generator.
Select one:
a.brush / brushless
b.commutating / non commutating
c.revolving armature / revolving field
d.slip ring / commutator

A

c.
revolving armature / revolving field

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12
Q

Increasing the turns or loops of wire on the rotating armature of a generator would cause a(n) ? output of the generator.
Select one:
a.decrease of current
b.decrease of voltage
c.increase of current
d.increase of voltage

A

d.
increase of voltage

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13
Q

A revolving armature AC generator has each end of the rotating loops or winding connected to what component(s)?
Select one:
a.the armature
b.the brushes
c.the commutator
d.the slip rings

A

d.
the slip rings

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14
Q

Increasing the speed of rotation or increasing the flux field strength are both ways to increase the output voltage of a generator without making physical changes to the machine.
Select one:
True
False

A

True

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15
Q

A 4-pole generator will be supplying several loads that are designed for 60 hertz. At what speed does the generator need to be driven?

A

1800 RPM

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16
Q

The revolving field AC generator has the armature windings positioned around the generator housing. The name given to the armature in this case is called the ? .
Select one:
a.coil
b.exciter
c.flux field
d.stator

A

d.
stator

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17
Q

The abbreviation PMG stands for a type of generator that uses ? for the flux field.
Select one:
a.perfect magnets
b.permanent magnets
c.potential magnets
d.pulse magnets

A

b.
permanent magnets

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18
Q

A rotating field AC generator is connected to the DC voltage source through slip rings.
Select one:
True
False

A

True

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19
Q

The DC voltage and current that is supplied to the field of a generator is called the ? power.
Select one:
a.armature
b.exciter
c.flux
d.input

A

b.
exciter

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20
Q

One full revolution of a 4-pole generator will result in ? cycle(s) of output.
Select one:
a.one-half
b.one
c.two
d.four

A

c.
two

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21
Q

The conductors and equipment connecting electric energy from the serving utility to the wiring system of the premises served is the NEC definition for service.
True
False

A

True

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22
Q

Service conductors made up in the form of a cable is the NEC definition for ?
a.service cable
b.service conductors
c.service entrance conductors
d.service lateral conductors
.

A

a.
service cable

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23
Q

? are defined in the NEC as the conductors from the service point to the service disconnecting means.
a.Service cables
b.Service conductors
c.Service entrance conductors
d.Service lateral conductors

A

b.Service conductors

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24
Q

Overhead service conductors are defined in the NEC as the overhead conductors between the service point and the first point of connection to the ? at the building or other structure.
Select one:
a.meter
b.service-entrance conductors
c.service lateral conductors
d.transformer

A

b.
service-entrance conductors

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25
Q

Underground service conductors are defined in the NEC as the underground conductors between the service point and the first point of connection to the overhead service conductors in a terminal box, meter, or other enclosure, inside or outside the building wall.
Select one:
True
False

A

False

26
Q

The point of connection between the facilities of the serving utility and the premises wiring is the definition of a ? in the NEC.
Select one:
a.demarcation point
b.meter
c.service drop
d.service point

A

d.service point

27
Q

The overhead conductors between the serving utility and the service point is the definition of a ? in the NEC.
a.demarcation point
b.meter
c.service drop
d.service point

A

c.service drop

28
Q

Overhead system service-entrance conductors are defined in the NEC as the service conductors between the terminals of the service equipment and a point ? , clear of building walls, where joined by tap or splice to the service drop or overhead service conductors.
Select one:
a.usually inside the building
b.usually outside the building
c.within 10’ of the structure
d.any of the above

A

b.usually outside the building

29
Q

Underground system service-entrance conductors are defined in the NEC as the service conductors between the terminals of the service equipment and the point of connection to the service lateral or underground service conductors.
Select one:
True
False

A

True

30
Q

Service equipment is defined in the NEC as the necessary equipment, consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories, connected to the serving utility and intended to constitute the main control and disconnect of the serving utility.
Select one:
True
False

A

True

31
Q

Service lateral is defined in the NEC as the overhead conductors between the utility electric supply system and the service point.
Select one:
True
False

A

False - Note: Service lateral is defined in the NEC as the underground conductors between the utility electric supply system and the service point.

32
Q

How many parts is Article 230 divided into?
Select one:
a.4
b.6
c.8
d.10

A

8

33
Q

Fuses are not permitted to be used with “service equipment.”
a. True
b. False

A

False - 230.90(A)

34
Q

What part of Article 230 addresses services exceeding 1,000 volts, nominal?
Select one:
a.II
b.IV
c.VII
d.VIII

A

VIII

35
Q

The scope of Article 230 covers service conductors and equipment for control and protection of services and their installation requirements.
a. True
b. False

A

True - 230.1

36
Q

Part I of Article 230 addresses which of the following?
Select one:
a.Disconnecting means
b.General
c.Ground fault protection of equipment
d.Service equipment

A

General

37
Q

How many conditions does the NEC list whereby conductors shall be considered to be outside of a building or other structure?
a. 3
b. 5
c. 7
d. 9

A

5 - 230.6

38
Q

Service conductors for one building are passed through the interior of another building. The service entrance conductors are installed in EMT and are located above a suspended ceiling.
a. Acceptable
b. Violation

A

violation - 230.3

39
Q

The general rule permits up to two service(s) for a building.
a. True
b. False

A

false - 230.2

40
Q

There are ? special conditions which allow for additional services that modify the general rule allowing only one service to a building.
Select one:
a.2
b.4
c.6
d.8

A

c.6

41
Q

Service conductors installed as a multiconductor cable without an overall outer jacket must have a clearance of not less than three feet from which of the following?
a. Balconies
b. Doors
c. Stairs
d. Windows designed to be opened
e. All of the above

A

e. All of the above - 230.9(A)

42
Q

Overhead service conductors are generally not permitted to be smaller than ? copper or ? aluminum.
a. 8 AWG / 8 AWG
b. 8 AWG / 6 AWG
c. 6 AWG / 8 AWG
d. 4 AWG / 6 AWG

A

b. 8 AWG / 6 AWG - 230.23(B)

43
Q

In no case shall the point of attachment of the overhead service conductors to a building or other structure be less than ? above finished grade.
a. 10’
b. 12’
c. 15’
d. 18’

A

a. 10’ - 230.26

44
Q

A service mast is used for the support of power service-drop conductors. Braces and guys are installed to adequately handle the stress imposed by the service-drop. The service mast is also permitted to be used to attach a communication cable to the building.
a. True
b. False

A

b. False - 230.28

45
Q

Overhead service conductors passing over the roof of a building generally require ? of vertical clearance above the roof surface.
a. 5’
b. 8’
c. 10’
d. 12’

A

b. 8’ - 230.24(A)

46
Q

Which wiring method is not permitted for use with service conductors rated for 1,000 volts, nominal, or less?
Select one:
a.ENT
b.Rigid metal conduit
c.Type IGS Cable
d.Type NM Cable
e.Type MC Cable

A

d.Type NM Cable

47
Q

Which part of Article 230 addresses underground service conductors?
Select one:
a.Part II
b.Part III
c.Part V
d.Part VI

A

b.Part III

48
Q

Which NEC first-level subdivision addresses the size of the grounded conductor installed as an underground service conductor?
Select one:
a.230.23(A)
b.230.31(C)
c.230.42(A)
d.a. and b.

A

b.
230.31(C)

49
Q

Which part of Article 230 addresses “service equipment — general?”
Select one:
a.Part II
b.Part III
c.Part V
d.Part VI

A

c.Part V

50
Q

Which part of Article 230 addresses the disconnecting means for service equipment?
Select one:
a.Part II
b.Part III
c.Part V
d.Part VI

A

d.Part VI

51
Q

Each service disconnect must be permanently marked to identify it as a service disconnect.
a. True
b. False

A

True - 230.70(B)

52
Q

Individual meter socket enclosures rated at 1,000 volts or less must be marked to identify them as being suitable for service equipment.
a. True
b. False

A

False - 230.66(B)

53
Q

The service disconnecting means must be installed at a readily accessible location outside or inside of a building nearest the point of entrance of the service conductor.
a. True
b. False

A

a. True - 230.70(A)(1)

54
Q

Which section of Article 230 addresses the maximum number of disconnects for a service?
Select one:
a.Section 230.21
b.Section 230.54
c.Section 230.62
d.Section 230.71

A

d.Section 230.71

55
Q

Service disconnecting means are permitted to be installed in bathrooms, provided they are suitable for the prevailing conditions.
a. True
b. False

A

230.70(A)(2)

56
Q

Service equipment in other than dwelling units is required to be marked in the field with the maximum available fault current with one exception. This exception is in industrial installations where conditions of maintenance and supervision ensure that only qualified persons service the equipment.
Select one:
True
False

A

True - Note: Review 110.9, 110.10, and 110.24

57
Q

Where exposed to weather or where embedded in masonry, raceways containing service-entrance conductors must be arranged to drain.
a. True
b. False

A

True - 230.53

58
Q

The location of the service overcurrent device shall be ?
a. an integral part of the service disconnecting means
b. located immediately adjacent to the service disconnecting means
c. either a. or b.
d. none of the above

A

c. either a. or b. - 230.91

59
Q

The ground-fault protection system for services must be performance tested when first installed on site.
a. True
b. False

A

True - 230.95(C)

60
Q

Service conductors and equipment used on circuits exceeding 1,000 volts, nominal, are covered by Part VIII of Article 230 and are exempt from Parts I through VII.
a. True
b. False

A

True - 230.200

61
Q

In accordance with Part III of Article 230, underground service conductors shall be installed in accordance with the applicable requirements of the Code covering the type of wiring method used and shall be limited to the ? methods provided for.
Select one:
a.7
b.10
c.16
d.20

A

10

IBEW 4th Term (3 decks)

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