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Electricity > 3 Phase & Motor Starters > Flashcards

3 Phase & Motor Starters Flashcards

1
Q

How many overloads are required to protect 3 phase?

A

3

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2
Q

Always check for _____ before working on any power circuit.

A

Voltage

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3
Q

A visual to tell if something is running?

A

Indicator lights

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4
Q

What does NEMA stand for?

A

National electrical manufacturing association

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5
Q

What 4 things make up a circuit:

A

1) Wiring
2) Source voltage
3) Switches
4) Load

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6
Q

When wiring a float switch, it should be wired in the _____ _____ position?

A

Normally open

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7
Q

What can be done to change the direction of any 3 phase motor

A

Switch A1 & A2

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8
Q

Wearable parts of a DC motor?

A

Brushes

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9
Q

Omega symbol stands for?

A

Ohms

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10
Q

What does a black box with yellow stripes mean?

A

250 VDC cranes

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11
Q

14 gauge wire is rated for how many amps?

A

20

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12
Q

DC stands for?

A

Direct current

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13
Q

What is the high voltage side of a step down transformer called?

A

Primary side

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14
Q

_____ _____ _____ are used to keep motor running without holding the start button in

A

Seal in tips

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15
Q

What voltage is supplied to a control transformer?

A

480 VAC

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16
Q

How many phases is a control transformer?

A

Single

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17
Q

A ______ ______ can be used to temporarily fix an electrical issue?

A

Jumper wire

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18
Q

What determines the size of a motor starter?

A

HP of motor

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19
Q

True or false:
A DC motor acts as a generator if it’s turned without power?

A

True

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20
Q

____ should always be neutral on a transformer?

A

X2

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21
Q

What is the initial surge of power going to a motor until it comes up to speed?

A

In rush current

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22
Q

What is wired into a circuit to control power of another component in the circuit

A

Control relay

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23
Q

Stop switches get wired in a ____.

A

Series

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24
Q

How do you find how many amps something uses?

A

Divide watts and voltage
I= P ➗ E

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25
Q

Motors under 20 HP are wired in a _____.

A

Y-configuration

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26
Q

How is a capacitor discharged in a motor?

A

It’s shorted

27
Q

12 gauge wire is rated for how many amps?

A

25

28
Q

IEC stands for?

A

International electrotechnical commission

29
Q

A ____ ____ distributes electric in a home?

A

Load center

30
Q

A black box indicates?

A

250 VDC

31
Q

A ____ ____ is used to protect a control transformer?

A

Control fuse

32
Q

What has to be supplied to the coil of a magnetic starter to close the moveable tips?

A

Voltage

33
Q

Type of wire used in home wiring?

A

Romex

34
Q

_____ take 480 VAC down to 120 VAC

A

Transformer

35
Q

In it’s resting state, a stop button should be in the ____ ____ position?

A

Normally closed

36
Q

Multiple stop buttons are wired in a _____?

A

Series

37
Q

What is used in a motor circuit to protect motor from high current?

A

Overloads

38
Q

The low voltage side of the transformer is called the _____?

A

Secondary

39
Q

A ____ _____ is used to make a motor run

A

Motor starter

40
Q

What wire should never be hooked to a switch?

A

Neutral

41
Q

To check for proper rotation after changing a motor you should always do what?

A

Bump test

42
Q

An example of a maintained button would be?

A

Emergency stop

43
Q

What should a meger read phase to ground?

A

550 mega ohms

44
Q

What should a meger read phase to phase?

A

OL

45
Q

A ____ ____ can be mounted in any box as a convenient place to make electrical connections

A

Terminal strip

46
Q

Red wire on a 3 way is called?

A

Traveller

47
Q

Colored wire indicates ____ ____ in motor starter bucket?

A

Control voltage

48
Q

10 gauge wire is rated for how many amps?

A

35

49
Q

Losing a phase in 3 phase is refered to as?

A

Single phasing

50
Q

When ringing a motor out with meter, phase to phase you should read?

A

.1 or above

51
Q

FLA stands for?

A

Full load amps

52
Q

What type of AC motor needs a boost to get started?

A

Single phase capacitor start

53
Q

Checking phase to ground with a meter should read?

A

OL

54
Q

What size wire should be used on a dryer or range?

A

10 guage

55
Q

A ____ ____ is wired into a motor starter control in the event that the motor needs to be run in manual or auto jog?

A

Selector switch

56
Q

What part of a DC motor rotates?

A

Armature

57
Q

What does IEC stand for?

A

International Electrotechnical Commission

58
Q

Start buttons are typically wired in ____?

A

Parallel

59
Q

In a series circuit ____ stay the same and _____ adds?

A

Amps
Resistance

60
Q

In a parallel circuit _____ stays the same and _____ add?

A

Voltage
Amps

61
Q

A rheostat is a _____ _____?

A

Variable resistor

62
Q

A _____ is used for direction?

A

Diode

63
Q

What does a yellow wire in an electrical panel mean?

A

It’s fed from a secondary power source

64
Q

What does MCC stand for?

A

Motor control center

Electricity (4 decks)

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