Alternators and Generators Flashcards

1
Q

Which two machines convert mechanical energy into electrical energy?

A

Alternators and Generators.

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2
Q

I am a rotating electrical machine, which converts mechanical energy into electrical energy or electrical energy into mechanical energy; What am I?

A

A dynamo.

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3
Q

I am a rotating electrical machine, which converts mechanical energy into electrical energy; I typically produce a direct current; What am I?

A

A generator.

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4
Q

I am a rotating electrical machine, which converts mechanical energy into electrical energy; I typically produce an alternating current; What am I?

A

An alternator. (synchronous generator)

{Generally moving at a synchronous speed to maintain a standard frequency}

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5
Q

I am a rotating machine, which converts explosive and gravitational forces into mechanical energy; What am I?

A

A prime mover.

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6
Q

I am a rotating electrical machine, which converts electrical energy into mechanical energy; I have a stationary part and a rotating part; What am I? What are they called?

A

A motor.

Stator, Rotor.

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7
Q

I am the point in space where the least flux is cut; What am I?

A

The neutral plane.

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8
Q

I rotate rapidly getting worn by brushes all day, I like to do the wave; What am I?

A

A slip ring.

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9
Q

I rotate rapidly getting worn by brushes all day, my conjoined twin brother and I always go in the same direction; What are we?

A

A commutator.

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10
Q

I am made of carbon and I operate very differently wether my flow is direct or alternating; What am I?

A

Brushes

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11
Q

How is electromotive force produced in an electrical machine?

A

Through electromagnetic induction.

{The polarity of emf generated may be found using Flemmings left hand rule}

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12
Q

What is the magnitude of generated emf proportional to?

A

Flux density,

Effective length of conductor within field,

Velocity of the conductor.

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13
Q

What is the way to control output voltage of an AC machine?

A

By varying field flux intensity.

{Changing speed would change the frequncy of the supply}

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14
Q

How is a smoother direct current waveform achieved with a commutator?

A

By splitting the commutator further and adding more coils in series.

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15
Q

How is output voltage of a DC machine controlled?

A

By varying field flux intensity generally,

Speed may be varied occasionally, however most machines run at a relatively constant speed.

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16
Q

What is the simplest way to vary field flux intensity?

A

To add a rheostat in series with the field winding.

17
Q

When is there a danger of overheating the field winding?

A

Nearing the point of magnetic saturation of the core material (the knee).