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19 Cards in this Set
- Front
- Back
- 3rd side (hint)
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When should the brushes in a starter motor be replaced? |
When they have worn to one half of the original length. |
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How is the direction of rotation of a DC electric motor reversed? |
Reverse the polarity of the armature or the field, but not both. |
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What is used as a rectifier to produce direct current in a DC generator? |
Brushes and a commutator. |
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What is used as rectifier to produce direct current in a DC alternator |
Six solid state diodes. |
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Is a starter motor series wound or shunt wound? |
Series wound for maximum stalled rotor torque |
Shunt wound would produce excessive torque. |
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What are two ways wires can be attached to the pins in a Cannon plug? |
1. Solder the wires into pots on the pins and sockets. 2. Crimping tapered pins unto the wires and inserting pins into the tapered holes in the pins and sockets |
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Why is stranded wire used rather than a solid wire in most powerplant electrical systems? |
Solid wires are likely to break when subjected to vibration. |
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What two things must be considered in selection of wire size when making an electrical installation in an aircraft? |
1. The current carrying capability of the wire, 2. The voltage drop caused by the flowing current through the wire. |
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What must be done to a DC generator after it has been overhauled before it can produce electricity? |
The field must be flashed to restore residual magnetism to the field frame so it can begin to produce current. |
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Why is it not necessary to flash the field of a DC alternator after it has been overhauled? |
The alternator field is excited by battery current and residual voltage is not used to start the alternator producing current. |
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What is used to protect the wire bundled from chafing where it passes through a hole in a bulkhead or frame? |
A grommet around edges of the hole. |
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How electrical wires protected where they pass through an area of high temperature? |
Insulated with high temperature insulation and then enclosed in some type of protective conduit. |
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What is the minimum separation allowed between a wire bundle and a fluid line that carries combustible fluid or oxygen? |
6 inches |
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Which aircraft electrical circuit does not normally contain a fuse or circuit breaker? |
The starter motor circuit. |
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What is a starter generator? |
A single engine mounted component that serves as a starter for starting the turbine engine. |
Once the engine is running the circuitry automatically shifts so it acts as a compound wound generator. |
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When should aircraft wiring be installed in a conduit? |
When the wiring passes through an area in the aircraft exposed to damage such as wheel wells. |
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What is meant by a trip-free circuit breaker? |
A circuit breaker that opens a circuit anytime and excessive amount of current flows regardless of the position of the circuit breaker's operating handle. |
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Which way should the toggle of a switch that controls the propeller pitch move to place the propeller in low pitch or high RPM? |
Forward. |
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Why I protective covers placed over some switches in an aircraft electrical circuit? |
To prevent the switch from being inadvertently actuated. |
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