3 Phase & Motor Starters

Question 1

How many overloads are required to protect 3 phase?

Answer 1

3

Question 2

Always check for _____ before working on any power circuit.

Answer 2

Voltage

Question 3

A visual to tell if something is running?

Answer 3

Indicator lights

Question 4

What does NEMA stand for?

Answer 4

National electrical manufacturing association

Question 5

What 4 things make up a circuit:

Answer 5

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

Question 6

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

Answer 6

Normally open

Question 7

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

Answer 7

Switch A1 & A2

Question 8

Wearable parts of a DC motor?

Answer 8

Brushes

Question 9

Omega symbol stands for?

Answer 9

Ohms

Question 10

What does a black box with yellow stripes mean?

Answer 10

250 VDC cranes

Question 11

14 gauge wire is rated for how many amps?

Answer 11

20

Question 12

DC stands for?

Answer 12

Direct current

Question 13

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

Answer 13

Primary side

Question 14

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

Answer 14

Seal in tips

Question 15

What voltage is supplied to a control transformer?

Answer 15

480 VAC

Question 16

How many phases is a control transformer?

Answer 16

Single

Question 17

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

Answer 17

Jumper wire

Question 18

What determines the size of a motor starter?

Answer 18

HP of motor

Question 19

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

Answer 19

True

Question 20

____ should always be neutral on a transformer?

Answer 20

X2

Question 21

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

Answer 21

In rush current

Question 22

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

Answer 22

Control relay

Question 23

Stop switches get wired in a ____.

Answer 23

Series

Question 24

How do you find how many amps something uses?

Answer 24

Divide watts and voltage
I= P ➗ E

Question 25

Motors under 20 HP are wired in a _____.

Answer 25

Y-configuration

Question 26

How is a capacitor discharged in a motor?

Answer 26

It's shorted

Question 27

12 gauge wire is rated for how many amps?

Answer 27

25

Question 28

IEC stands for?

Answer 28

International electrotechnical commission

Question 29

A ____ ____ distributes electric in a home?

Answer 29

Load center

Question 30

A black box indicates?

Answer 30

250 VDC

Question 31

A ____ ____ is used to protect a control transformer?

Answer 31

Control fuse

Question 32

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

Answer 32

Voltage

Question 33

Type of wire used in home wiring?

Answer 33

Romex

Question 34

_____ take 480 VAC down to 120 VAC

Answer 34

Transformer

Question 35

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

Answer 35

Normally closed

Question 36

Multiple stop buttons are wired in a _____?

Answer 36

Series

Question 37

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

Answer 37

Overloads

Question 38

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

Answer 38

Secondary

Question 39

A ____ _____ is used to make a motor run

Answer 39

Motor starter

Question 40

What wire should never be hooked to a switch?

Answer 40

Neutral

Question 41

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

Answer 41

Bump test

Question 42

An example of a maintained button would be?

Answer 42

Emergency stop

Question 43

What should a meger read phase to ground?

Answer 43

550 mega ohms

Question 44

What should a meger read phase to phase?

Answer 44

OL

Question 45

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

Answer 45

Terminal strip

Question 46

Red wire on a 3 way is called?

Answer 46

Traveller

Question 47

Colored wire indicates ____ ____ in motor starter bucket?

Answer 47

Control voltage

Question 48

10 gauge wire is rated for how many amps?

Answer 48

35

Question 49

Losing a phase in 3 phase is refered to as?

Answer 49

Single phasing

Question 50

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

Answer 50

.1 or above

Question 51

FLA stands for?

Answer 51

Full load amps

Question 52

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

Answer 52

Single phase capacitor start

Question 53

Checking phase to ground with a meter should read?

Answer 53

OL

Question 54

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

Answer 54

10 guage

Question 55

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

Answer 55

Selector switch

Question 56

What part of a DC motor rotates?

Answer 56

Armature

Question 57

What does IEC stand for?

Answer 57

International Electrotechnical Commission

Question 58

Start buttons are typically wired in ____?

Answer 58

Parallel

Question 59

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

Answer 59

Amps Resistance

Question 60

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

Answer 60

Voltage Amps

Question 61

A rheostat is a _____ _____?

Answer 61

Variable resistor

Question 62

A _____ is used for direction?

Answer 62

Diode

Question 63

What does a yellow wire in an electrical panel mean?

Answer 63

It's fed from a secondary power source

Question 64

What does MCC stand for?

Answer 64

Motor control center