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HVAC 1030 & 1040 > CH 8 & 9 Test > Flashcards

CH 8 & 9 Test Flashcards

1
Q

What is magnetism?

A

Attraction of an object for iron and is exhibited by a permanent magnet or an electric magnet

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2
Q

What is induced magnetism?

A

Created when a piece of iron is placed in a magnetic field. The closer the object is to the magnet, the stronger the magnetic field is.

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3
Q

When is a magnetic field stronger?

A

When the object is closer to the magnet.

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4
Q

What are magnetic lines of force?

A

Invisible lines that represent the direction and strength of a magnetic field

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5
Q

What is magnetic flux?

A

Lines of force of a magnet that flow between the north and south poles

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6
Q

South Pole of magnet to the North Pole of magnet do what?

A

Attract

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7
Q

Magnetism can only be induced by the earths core. (True or false)

A

False

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8
Q

A permanent magnet is a piece of magnetic material that can hold its magnetic strength. (True or false)

A

True

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9
Q

What are the two types of magnets?

A

Permanent magnet and electromagnet

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10
Q

Magnets have 3 poles. (True or False)

A

False

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11
Q

What is an electromagnet?

A

Magnet produced through electricity

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12
Q

A brushless DC motor with a 3 phase winding is?

A

ECM

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13
Q

Alternating current motor speed is determined by?

A

The frequency of power supply only

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14
Q

How do electric motors work?

A

Electric energy is changed to mechanical energy by magnetism, which causes motor to turn.

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15
Q

To make an electric motor work continuously the magnetic field must rotate. (True or false)

A

True

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16
Q

The most commonly used rotor today is?

A

Squirrel cage rotor

17
Q

Motor speed is generally used to classify motors into different types. (True or false)

A

False (Starting torque)

18
Q

Motors are selected mainly because of the starting torque required to perform its function. (True or false)

A

True

19
Q

A capacitor consists of two aluminum plates with an insulator between them. (True or false)

A

True

20
Q

A resistance start induction run motor has only a starting winding. (True or false)

A

False

HVAC 1030 & 1040 (9 decks)

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