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15 Cards in this Set
- Front
- Back
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How would you seat newly installed generator brushes to the commutator? |
When new brushes are installed in a generator the face of the brushes must be shaped to provide an area of maximum contact with the Commutator. To seat the brushes, use fine grain sandpaper placed around the commutator with the sanding surface facing outward. Turn the armature in a normal direction of rotation until the face of the brushes is properly contoured. Remove the sandpaper and blow out any residue with compressed air. |
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Where is the generator rating and performance data located? |
Data plate attached to the generator |
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What units make up a DC generator three unit regulator? |
Voltage regulator, current limiter and reverse current cutout. |
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What method is used to control the voltage of an aircraft alternator? |
Voltage regulator |
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What determines the frequency of the voltage of an alternator? |
Speed of rotation of the rotor and the number of poles. |
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How is alternator frequency maintained? |
Constant speed drive |
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What are the three basic types of DC motors? |
Series motors, shunt motors, and compound motors. |
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Name the parts of a DC motor. |
Armature, Commutator, brushes, and field frame. |
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Why is a starter-generator system, used on many turbine engines? |
Starter-generator operates as a starter motor to drive the engine during starting. After the engine has reached a self-sustaining speed it switches operation to a generator for supplying electrical power for the systems. |
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What is the American Wire Gauge system of designating electrical wire size? |
A gauge number is assigned the wire according to its cross-sectional area. |
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What is open wiring? |
Any wire, wire group or wire bundle not enclosed in conduit. |
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What methods are used to control the voltage output of DC aircraft generator? |
The vibrating type voltage regulator, three-unit regulator and carbon-pile. |
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What are the causes of excessive arcing at the generator brushes? |
Arcing can be caused by a commutator that is dirty, rough or out of round. A common cause of arcing is worn or binding brushes, or brush spring tension is too low. |
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When installing single wires or wire bundles, how much slack is normally allowed between supports? |
Slack between supports should normally not exceed one-half inch. |
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What precaution should be taken when running wires close to heating ducts or exhaust stacks? |
Should be insulated with a high resistant temperature material. |
