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motors and controls > Motors And Controls Final Exam > Flashcards

Motors And Controls Final Exam Flashcards

1
Q

Are AC power source motors induction or conduction types?

A

(AC) has brushes

induction

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2
Q

Are DC power source motors induction or conduction types?

A

Conduction

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3
Q

Which electrical motor runs on either AC or DC?

A

Universal

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4
Q

If the electrical current through the coil is reversed, what would happen to the produced magnetic field?

A

Reverse

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5
Q

What are two types of motor operation on a magnetic motor starter can provide?

A

Start

Stop

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6
Q

What advantages does a single-phase motor have over a three-phase motor?

A

Can be used where 3-phase can’t

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7
Q

Which type of electric motors require start windings?

A

Single phase induction motor

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8
Q

What is the advantages of installing the control circuit as a class defined power source circuit if possible?

A

Control circuit runs on a lower volatage for safety reasons

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9
Q

How is a single-phase motor reversed?

A

Reverse start or the auxiliary, but not both

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10
Q

How is a three-phase motor reversed?

A

Change any 3-phase comnection to the start winding

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11
Q

What two functions do capacitors perform in a single-phase motors?

A

Start

Run

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12
Q

Condition where the magnetic poles of the run winding will alternate between north and south at sychonous speed of the power supply but does not product rotation?

A

Locked rotor

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13
Q

This is used to determince the amount of mechanicl work that can be performed?

A

Torque

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14
Q

This is a measurement used to determine how much work is heing completed in a certain amount of time?

A

Power

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15
Q

List the three types of relays that may be used to disconnect the start winding of single-phase motors when a centrifugal switch on the rotor shaft cannot br used?

A

Current relay
Potential relay
Solid state relay

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16
Q

What components does a single-phase motor require that a three-phase motor does not?

A

Start and run capacitors

17
Q

Is the start winding a lower or hogher resistance than the main winding?

A

Higher

18
Q

Is the start winding a smaller or bigger gauge than thr main winding?

A

Smaller

19
Q

What are two purposes for run capacitors in the auxiliary winding?

A

Maintaining torque

Create a phase-shift between auxiliary winding

20
Q

What is the main limitation of shaded-pole motors?

A

Low starting torque and low efficiency

21
Q

Single phase induction motor both start and run reversed, what would happen to rotation?

A

Nothing

22
Q

Which electrical property is responsible for creatig magnetic flux?

A

Induction

23
Q

Why are induction motors so popular?

A

More reliable at a lower cost

24
Q

The terminals at the bottom of a motor starter are labeled what?

A

2 and 3

25
Q

Which circuit conductod gets landed on the top terminals of a motor stater?

A

L1, L2, and L3

26
Q

The overload contacts are wired in which circuit?

A

Between the starter and neutral leg of the control circuit

27
Q

Why does the moving contact of a relay sweep across the face of rhe stationary contact?

A

Mechanically clean

28
Q

Which unit has both controls circuit?

A

The contactor

29
Q

FLA ?

A

Full loaded amps

30
Q

LRA?

A

Locked rotor amps

31
Q

List two instances when a motor will be exposed to LRA?

A

at startup

Low starting toque

32
Q

When reversing a single-phase motor what terminals are switched?

A

T5 and T8

33
Q

What are three winding configurations for DC motors?

A

Series
Shunt
Compound

34
Q

This winding has small number of turns?

A

Series

35
Q

This winding uses a strong flux to keep the armature locked in and requires the field to be powered first before the armature

A

Shunt winding

36
Q

DC motor that uses both series and shunt winding?

A

Compound winding

37
Q

What is nominal voltage?

A

Designed or figuration voltage

motors and controls (1 decks)

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