A1 LT19 Flashcards

1
Q

What are the brushes made of?

A

Graphite carbon

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2
Q

How many rpm does the prime mover of a four-pole alternator need to produce a 60 hertz waveform?

A

1800 rpm

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3
Q

What is the challenge with passing a conductor through a magnetic field?

A

Keeping the conductor moving continuously

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4
Q

What is the purpose of the brushes?

A

Carry current to load circuit

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5
Q

What supplies the mechanical energy to the alternator?

A

Prime mover

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6
Q

What is the part of the alternator where voltage is induced?

A

Armature

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7
Q

Name some common examples of prime movers.

A

Steam turbines, water turbines, internal combustion engines, windmills

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8
Q

Can a hand crank serve as a prime mover for an alternator?

A

Yes

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9
Q

How do the conductors connect in an alternator?

A

In series

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10
Q

What happens when each loop is added to the alternator’s armature?

A

Increases generated voltage

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11
Q

How many poles do the armature windings of a six-pole alternator pass every revolution?

A

3 north, 3 south

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12
Q

What rpm does the prime mover need to turn at to produce a 60 hertz output in a six-pole alternator path?

A

1200 rpm.

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13
Q

How can the magnitude of the induced voltage be controlled?

A

By altering variables I or v

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14
Q

What are slip rings made of and how are they positioned on the alternator shaft?

A

Brass, two complete loops

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15
Q

Why does an alternating current generator produce an alternating voltage?

A

Angle and direction of cutting flux lines change continuously.

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16
Q

What is the relationship between the frequency of generated emf and the number of field poles in the alternator?

A

Directly proportional.