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HVAC 1030 & 1040 > Test Unkown > Flashcards

Test Unkown Flashcards

1
Q

What are the two principles of an AC induction motor?

A

Stator and rotor

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2
Q

The part of an inductor rotor that turns or rotates

A

Rotor

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3
Q

The part of an AC induction motor that flows

A

Stator

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4
Q

How does the motor of an AC induction motor receive current?

A

rotating magnetic field that induces current in the rotor

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5
Q

AC induction motor speed is determined by

A

Poles

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6
Q

This type of motor has low starting torque

A

Shade pole motor

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7
Q

The twisting motor force

A

Torque

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8
Q

The speed of an AC induction motor is determined by

A

Frequency and number of poles

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9
Q

What is the primary purpose of a run capacitor

A

Increase motor efficiency

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10
Q

What is the primary purpose of a start capacitor

A

Increase motor torque

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11
Q

Start capacitor in a motor is removed from a circuit by?

A

Starting relay

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12
Q

What is the proper way to discharge a capacitor is

A

To connect a 20K ohm bleed resistor across the terminals

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13
Q

The most common motor in AC is

A

PSC (permanent split capacitor)

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14
Q

The start capacitor is removed from the circuit by

A

Potential starting relay

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15
Q

The run capacitor on a PSC motor

A

Stays in circuit during motor operation

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16
Q

The capacitor in in a PSC motor is located

A

In series with start winding

17
Q

A technician just replaced a motor but it’s running backwards

A

Switch connection of any two power leads

18
Q

Compare a single phase motor and a 3 phase motor

A

Single phase motor - lower power applications and requires start capacitor

3 phase motor - consistent power and industrial application

19
Q

How to reverse the rotation of a 3 phase motor

A

Reverse power leads

20
Q

Major difference between 3 phase motor

A

Doesn’t require starting components

HVAC 1030 & 1040 (9 decks)

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