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18 Cards in this Set
- Front
- Back
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Produces the magnetic flux |
field |
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Part of an Ac generator in which voltage is produced |
Armature |
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Component that drives the generator |
Prime Motor |
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Part that is turning |
Rotor |
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Part that is stationary |
Stator |
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Calculate the output frequency for an AC generator when the number of poles = 2 and the RPM =3600 |
(3600)(2)/120=60Hz |
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Calculate the output frequency for an AC generator when the number of poles = 4 and the RPM = 1500. |
(1500)(4)/120=50Hz |
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List the losses found in a AC generator: |
Copper losses, Armature resistance, Armature inductive reactance, Eddy current losses, Hysteresis losses and mechanical losses |
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AC generator power ratings are based on: |
The ability of the prime mover to overcome generator losses and generator heat dissipation |
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The current rating of an AC generator is based on: |
The electrical insulation rating |
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Placing two generators in parallel with output voltage out of phase will result in: |
the development of large opposing voltage |
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The difference between a rotating field stationary armature AC generator and a stationary field rotating armature AC generator. |
The rotating Field generator output is connected to the load without moving contacts. The stationary field generator output can be interrupted because of worn or dirty moving contacts |
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In a wye-connected generator |
one side of each armature windings is connected to the same point
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In a delta-connected generator |
the three armature winding are are connected in series |
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A major advantage of a delta-connected generator is: |
if one phase is damaged, the remaining two can deliver three phase power |
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a major advantage of a wye-connected generator |
each phase carries 57.7% of line voltage and is used for high voltage generation |
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what best describes the difference between the delta and the wye? |
In a delta connection, the three phases are connected in series forming a loop; while in wye connection each of the the phases has one leg of the phase connected to a common point. |
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What is the purpose of a voltage regulator? |
maintains the output voltage of a generator at a desired value. |
