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28 Cards in this Set
- Front
- Back
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Why is stranded wire used rather than solid wire in most powerplant electrical systems? |
Solid wire is likely to break when it is 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?
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The current–carrying capability of the wire and the amount of voltage drop |
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Why are the wires in certain electrical installations twisted together?
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The magnetic fields of the wire are minimized. |
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What is used to protect a wire bundle from chafing where it passes through a hole in a bulkhead or frame?
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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?
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Wires are insulated with high temperature insulation. |
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What is the minimum separation that is allowed between a wire bundle and a fluid line that carries combustible fluid or oxygen?
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A minimum of six inches.
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What is the maximum number of wire terminals that may be stacked on a single stud in a terminal strip?
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Four |
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Why must a switch be derated if it is used in a circuit controlling a DC electric motor?
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Because of the high inrush current, the controlling switches must be derated. |
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What is used as the rectifier to produce direct current in a DC generator?
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Brushes and a commutator. |
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How does a vibrator–type voltage regulator control the output voltage of a DC generator?
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When the voltage rises above the regulated value, the relay inserts a resistor in the generator field circuit. |
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What is meant by paralleling the generators of a twin–engine aircraft?
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Adjusting the voltage of the generators so they will share the electrical load equally. |
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What is meant by flashing the field of a DC generator?
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Restoring the residual magnetism to the frame of a generator. |
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What three things must be synchronized before a three–phase AC generator can be connected to a bus that is being served by another generator?
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The voltage, the frequency, and the phase rotation. |
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Does a series–wound DC motor have a high or a low starting torque?
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A high starting torque. |
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Which aircraft electrical circuit does not normally contain a fuse or circuit breaker?
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The starter motor |
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When removing a battery from an aircraft, which connection should be removed first?
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The ground connection must be disconnected first. |
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What is a starter–generator that is used with many of the smaller gas turbine engines?
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Generator that serves as a starter for turbine engine. When the engine is running it acts as a generator. |
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When should aircraft wiring be installed in a conduit?
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When the wiring passes through an area in the aircraft where open wiring could likely be damaged. |
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When should the brushes in a starter motor be replaced?
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When they have worn to half of their original length |
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How is the direction of rotation of a DC electric motor reversed?
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Reverse the polarity of the armature or the field, but not both |
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What is used as the rectifier to produce direct current in a DC alternator?
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Six solid–state diodes |
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Is a starter motor series–wound or shunt–wound?
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Series wound |
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What are two ways wires can be attached to the pins in a cannon plug?
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By soldering the wires into pots on the pins |
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What must be done to a DC generator, after it has been overhauled, before it can produce electricity?
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The field must be flashed |
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Why is it not necessary to flash the field of a DC alternator after it has been overhauled?
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An alternators field is already excited by battery current |
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What is meant by a trip–free circuit breaker?
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A circuit breaker that opens as long as the fault exists, regardless of the position of the 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 (high RPM)?
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Forward |
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Why are protective covers placed over some switches in an aircraft electrical circuit?
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To prevent the switch from being inadvertently actuated |
