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Motor Controls > Defenitions > Flashcards

Defenitions Flashcards

1
Q

What type of control system requires a human operator?

A

Manual

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2
Q

What type of control is characterized by using a push button, pressure switch or other sensing device to operate a magnetic contactor or starter? The operator still needs to initiate the action such as starting or stopping, but the motor is connected to the line directly by the starter, being controlled by our input.

A

Semi-auto

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3
Q

What type control system does not require an operator?

A

Automatic

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4
Q

What are some types of motor control systems we use every day?

A

Garage door opener
Microwave
Dishwasher
Bathroom fan
Light switch

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5
Q

What are the three types of control systems?

A

Manual

Semi automatic

Automatic

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6
Q

What are five factor factors that will influence the design of a control system when we are talking about installing motors and control equipment?

A

Power source

Motor connections

Motor type

Controller type

Electrical code

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7
Q

What are conductive parts which co-act with another to either complete or interrupt Circuits?

A

Contacts

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8
Q

What kind of contact is sized to carry the full load current to the motor or load?

A

Pole contacts

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9
Q

What kind of contacts move and are usually spring loaded?

A

Moveable contacts

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10
Q

What kind of context do not move?

A

Stationary contacts

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11
Q

What Kind of contact maintains power to the contactor after the start button is released?

A

Holding contacts

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12
Q

What type of contact can be N.O. And/or N.C. And can change state when the coil is energized?

A

Auxiliary contacts

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13
Q

Define button interlocking

A

The electrical prevention of two circuit actions from taking place simultaneously.

The activation of a button will open the circuit to one coil and close the circuit path to the other coil.

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14
Q

Define mechanical interlocking

A

Physical prevention of two actions from taking place simultaneously. One Action Taking place prohibits the other action from taking place.

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15
Q

Define electrical auxiliary interlocking

A

The electrical prevention of two actions were taking place simultaneously.

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16
Q

The difference between a motor starter and a contactor is the addition of a___________.

A

Overload relay

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17
Q

Are you allowed to use to push button and electrical auxiliary interlocking in the same circuit?

A

Yes

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18
Q

Abbreviation for the term “single pole, double throw”

A

SPDT

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19
Q

To reverse the rotation of a three phase motor, interchange ________ motor leads

A

Any two

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20
Q

The CEC dictates that the three phases shall be coloured as follows:

L1 _______
L2_______
L3_______

A

Red
Black
Blue

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21
Q

To reverse the rotation for a single phase motor, you must interchange either the_____________ or the ___________, but not both.

A

Starting windings

Run windings

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22
Q

By industry standard, the two T leads that are most often interchange to reverse the direction of a single phase motor are?

A

T5 and T8

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23
Q

A float switch that is used to control a motor directly must be rated to carry the________ of the motor

A

Full load current

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24
Q

The load terminals for a three phase motor starter protector are labelled…

A

T1
T2
T3

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25
Q

Does every motor require overload protection?

A

Yes, unless proven to be exempt

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26
Q

Overlook protection does not protect a motor from short circuits, motors are protected from short circuits by___________ and ____________.

A

Fuses
Breakers

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27
Q

An open line feeding a three phase motor starter can cause a motor to hum, not spin, fast, and labor, this condition is referred to as……

A

Single phasing

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28
Q

What are two basic types of O/L relays?

A

Thermal

Magnetic

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29
Q

What are the two major types of thermal overload relays?

A

Solder pot

Bi-metallic

30
Q

What are the two major types of magnetic overload relays?

A

Electronic

Dashpot

31
Q

The contacts of a motor starter that carry the full load current of the motor are called __________,_________ or _________ contacts.

A

Pole
Line
Load

32
Q

The contacts of a motor starter that do not carry motor currents are called?

A

Auxiliary contacts

33
Q

Took of control method allows an operator to connect a motor momentarily at reduced voltage to cost small movements of motor driven machinery?

A

Inching

34
Q

“Two wire control” provides “no or low-voltage__________”

A

Release

35
Q

Multiple stop buttons that control a magnetic motor starter are connected in_____________.

A

Series

36
Q

The contact used to maintain a circuit after the start button has been released is called the……

A

Holding contact

37
Q

Control circuit diagram that is used to illustrate the logical relationship of the circuits and its components, without regard to actual location of components, it’s called……….

A

Line diagram

38
Q

What is the contact that will open motor control circuit in the event of prolong overcurrent?

A

Overload contact

39
Q

“Three wire control” provides “no or low voltage _____________”

A

Protection

40
Q

Teresa a fractional manual motor starter after an overload, the switch has to be moved to the full________ position before the motor can be restarted

A

Off

41
Q

Additional start buttons added to control a magnetic motor starter protector are always connected in _________ with existing start button

A

Parallel

42
Q

Magnetic control circuits use_____________ energy to close switches

A

Electromagnet

43
Q

What are the three names given to the contacts of a motor starter protector that carry the full load current of a motor?

A

Pole

Line

Load

44
Q

What’s the name of the contact of a motor starter protector that does not usually carry the full load current of a motor

A

Auxiliary contacts

45
Q

The ring used to prevent chattering of the stationary and moving components of a motor starter coil is called

A

Shading coil

46
Q

Push buttons are manual and momentary contact devices

True or false

A

True

47
Q

What are two other names for line diagrams?

A

Schematic and ladder

48
Q

Schematic diagrams are read from:

Left to right top to bottom ?
Right to left bottom to top ?
Top to left bottom to right ?

A

Left or right top to bottom

49
Q

What type of diagram shows all components of the system in physical relation to each other complete with connecting wire wires?

A

Wiring diagram

50
Q

Type of diagram shows the control devices in their logical order of operations without regard to their physical location

A

Line (ladder) diagram

51
Q

What are the three basic sectors of a control circuit?

A

Stop sector
Start sector
Run sector

52
Q

In a manual control circuit, operation of the circuit is dependent on?

A

An operator physically activating a manual device

53
Q

What type of control circuit is dependent on the activation of both manual device devices by operator and activation of automatic device devices such as a limit switch float switch or timer?

A

Semi automatic

54
Q

Manual control does not provide no voltage or low voltage protection, true or false

A

True

55
Q

Motor service that incorporates overload protection is also a?

A

Motor protector

56
Q

What does low-voltage and no voltage protection ensure?

A

The safety of the operator

57
Q

When a magnetic motor starter protector is used with pilot devices a better degree of ________can be achieved?

A

Control

58
Q

Button contacts may be normally open or normally closed

True or false

A

True

59
Q

How must additional start buttons be connected with existing start button buttons?

A

In parallel

60
Q

How much does additional buttons be connected with existing stop buttons?

A

Series

61
Q

What is a control relay?

A

Small electromagnetic device

62
Q

Which control relay typically used for?

A

Enhance the flexibility and compatibility of a control circuit

63
Q

What’s ensuring that two or more motors start in a specific order known as?

A

Sequence control

64
Q

When installing motor control system, list, four major factors to consider concerning the power system

A

Power supply
Motor horse power
Motor in rush current
Environment

65
Q

Where is the best place to look for specific information about a motor?

A

Motor face plate

66
Q

What type of control has no dependence on automatic functions?

A

Manual

67
Q

What type of control has no dependent on manual function?

A

Automatic

68
Q

What type of control is dependent on stop and start function

A

Semi automatic

69
Q

Jogging is momentarily connecting motor to full line voltage
True or false

A

True

70
Q

Inching is momentarily connecting motor to reduced voltage
True or false

A

True

71
Q

What is the most common method of controlling a speed of an AC motor?

A

Variable frequency control

72
Q

What is meant by the term ramping?

A

The acceleration of a motor from rest to full speed over a period of time

Motor Controls (1 decks)

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