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19 Cards in this Set
- Front
- Back
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When should the brushes in a starter motor be replaced? |
When they have worn one half of their original length. |
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How is the direction of rotation of a DC electric motor reversed? |
By reversing 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 the DC generator? |
Brushes and commutator. |
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What is used as a 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 torque. |
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What are two ways wires can be attached to the pins in a Cannon plug? |
By soldering the wires to the pots on the pins and sockets. By crimping a tapered pins onto the wires and inserting the pins into a tapered holes in the pin and sockets. |
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Why is stranded wire used rather than solid wire in most power plant electrical systems? |
Solid wires are likely to break due 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? |
Current carrying capacity of the wire and the voltage drop caused by the current flow 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? |
Because its field is excited by battery current and residual voltage is not used to start the alternator to produce current. |
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What is used to protect the wire bundle from chafing where it passes through a hole in a bulkhead or frame? |
A grommet around the edges of the hole. |
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How are electrical wires protected where they pass through an area of high temperature? |
Insulated with high temperature insulation and the wires 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 fluids or oxygen? |
6 inches |
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Which aircraft electrical circuit does not normally contain a fuse or a circuit breaker? |
A 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 it passes through an area where wiring could be damaged such as a wheel well. |
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What is meant by a trip-free circuit breaker? |
A circuit breaker that opens the circuit anytime an excessive amount of current flows regardless of the position on the circuit breakers 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 are protective covers placed over some switches in an aircraft electrical circuit? |
Prevents the switch from being inadvertently actuated. |
