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Mechanics > Ac Motors > Flashcards

Ac Motors Flashcards

1
Q

What Voltage AC motor cannot run in a 3 phase duty cycle?

A

120V

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2
Q

Reasons an AC motor overheats

A

Low or high voltages
Repeated restarts
High ambient temperatures
Blocked vent holes

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3
Q

A 1.15 service factor means an AC motor can take what % of overload?

A

115%

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4
Q

A 2 letter motor code indicates

A

1/16th increments

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5
Q

A 3 letter motor code indicates

A

1/4” inch increments

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6
Q

“T” means what in motor nomenclature?

A

Long shaft

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7
Q

Overloads protect what?

A

The motor

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8
Q

Fuses protect what?

A

Wire

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9
Q

A motor with a red reset button on the motor has what type of overloads?

A

Manual thermal overloads

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10
Q

A motor that starts back up when it cools down has what type of overloads?

A

Automatic thermal overloads

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11
Q

What is slip?

A

The difference between the synchronous speed and the actual rotor speed?

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12
Q

Motor parts list

A
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13
Q

The more poles a motor what rating increases?

A

Torque increases

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14
Q

The less poles a motor has the higher the?

A

RPM

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15
Q

What are the workhorses of industry?

A

Motors

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16
Q

A motor with a copper ring in the direction of roation? (Shader ring)

A

Shaded pole motor

17
Q

A single phase motor with a separate start winding that times out after start up?

A

Split phase motor

18
Q

The most common single phase motor used in industrial settings?

A

Capacitor start motor

19
Q

A fractional horsepower motor most commonly used in HVAC?

A

Permanent split capacitor motor

20
Q

A motor that bolts directly to the driven machinery

A

D flange

21
Q

A motor with a finished face built into one end bell of the motor some times referred to as an end shield?

A

C-face motor

22
Q

What are the 2 basic types of motors?

A

AC and DC

Mechanics (14 decks)

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