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18 Cards in this Set
- Front
- Back
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What two things must you take into consideration when selecting the wire size to use in an aircraft electrical system installation? |
The current carrying capacity of the wire and the voltage drop caused by the current flow through the wire. |
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What is the maximum number of wires that should be connected to a single stud in a terminal strip? |
4 |
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How are wire bundles protected from chafing where the bundle goes through a hole in the fuselage frame or bulkhead? |
Cover the edges of the hole with flexible grommets and the bundles are secured to the structure with cushioned clamps |
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What kind of clams are used to secure a wire bundle to aircraft structure? |
Cushioned Clamps |
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Why are solderless splices usually better than soldered spices in the wiring of an aircraft electoral system. |
Because the are less likely to be damaged from vibration |
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What size of generator must be used in an aircraft electrical system if the connected electrical load is 30 amps, and there is no way of monitoring the generator output? |
If there's no possibility of monitoring the continuous connected electrical load it should not be more than 80% of the rated generator output, which about 37.5 amps or rounded up to 40 amps |
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On which wing is the red navigation light? |
Left wing |
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What kind of fault can be found in a generator armature with a growler? |
Shorted coils |
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Does an Aircraft engine electrical starter use a series or a parallel motor? |
Series wound motor for great torque |
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What is the main disadvantage of aluminum wire over copper wire for using in aircraft electrical system? |
Aluminum wire is brittle and more susceptible to breakage when nicked or subjected to vibration |
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What kind of rectifier is used in small DC alternators installed in most light aircraft? |
6 Silicon diodes arranged in three phase full wave rectifier |
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What kind of instrument would you use to measure very high resistance? |
Megohmeter or Megger the registered trade name of the instrument |
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When is it important that aircraft electrical system wire bundles be closed in some type of conduit? |
When they are wired through areas subjected to rough handling and abrasions are likely |
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What size aluminum wire would be proper to replace a piece of 4 gauge copper wire |
2 gauge wire |
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What is the smallest size aluminum wire that is approved for use in aircraft electrical systems? |
6 gage wire |
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What three things must be synchronized before an aircraft AC generator is placed on the same bus with another AC generator? |
The voltage, the frequency, and the phase rotation |
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How can the direction of rotation of the amateur of a DC-shunt wound electric motor be reversed? |
Reverse the amateur or the shunt field coil connection with reference to the other |
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What is meant by flashing the field of a generator? |
Restoring the residual magnetism to the frame of the generator. Done by passing battery current through the field coils in the normal direction of flow. |
