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16 Cards in this Set
- Front
- Back
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What is the purpose of a circuit breaker? |
To protect the circuits and wires from fire. |
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What tool is used to measure the size of unmarked electrical wire? |
A wire gauge |
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What are the colors of aircraft position lights and where are they mounted? |
A green light is mounted on the right wingtip, a red light on the left wingtip, and a white light are mounted in a position where it is visible from the rear of the aircraft. |
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What are the factors to be considered when selecting wire size for electrical power? |
One factor is the allowable power loss in the line. A second factor is the permissible voltage drop in the line, and a third factor is the current-carrying ability of the conductor. |
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When is a circuit breaker or fuse designed to open the circuit? |
Before the conductor emits smoke. |
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What are the three most common faults that occur in an electrical circuit? |
Open circuits, Shorted circuits, and low power circuits. |
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What size electrical conduit should be used for a specific cable bundle? |
Should have an inside diameter that is 25% larger than the maximum diameter of the conductor bundle. |
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When should electrical switches be derated from their normal current rating? |
For high rush-in circuits that have energy stored in solenoid coils, or relays, and for DC motor circuits, which draw several times their rated current during starting. |
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When do DC electric motors draw several times their rated current? |
During starting |
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What would cause an AC electric motor to run too fast? |
Excessive supply of voltage or the motor field windings shorted. |
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What would cause an AC electric motor to run too slow? |
Low applied voltage, defective wiring, or no lubrication |
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How is the output voltage of an alternator controlled? |
By using a voltage regulator to control the exciter filed current and thus regulate the exciter output voltage applied to the alternator field. |
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What should be checked before any aircraft electrical load is increased? |
The associated wires, conductors, and circuit protection devices should be checked to determine that the new load will not exceed the rated limits of these units. |
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What is the main advantage of using AC for aircraft electric power systems? |
Easily changed by the use of transformers. You can transmit power at a high voltage and a low current, thus reducing the size and weight of the wiring of the wiring in the circuit. |
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In AC power systems, how is DC obtained for battery charging? |
By the use of rectifiers |
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How long should bonding jumper wires be made? |
Short as possible to prevent an increase in resistance and large enough to handle all the return current flow. |
