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Power-Plant
ENGINE ELECTRICAL SYSTEMS
| Question | Answer |
|---|---|
| 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. |
| What two things must be considered in selection of wire size when making an electrical installation in an aircraft? | The current-carrying capability of the wire and the amount of voltage drop that is caused by current flowing through the wire. |
| Why are the wires in certain electrical installations twisted together? | By twisting the wires together, the magnetic fields caused by current flowing in the wires are minimized. |
| What is used to protect a wire bundle from chafing where it passes through a hole in a bulkhead or frame? | A grommet around the edges of the hole. |
| How are electrical wires protected where they pass through an area of high temperature? | Wires passing through these areas are insulated with high temperature insulation, and the wires are enclosed in some type of protective conduit. |
| What is the minimum separation that is allowed between a wire bundle and a fluid line that carries combustible fluid or oxygen? | A minimum of six inches. |
| What is the significance of the color of the solderless connectors that are used on electrical wires? | The color of the insulation indicates the size of wire the connector will fit. Red terminals fit 22- through 18-gage wire, blue terminals fit 16- and 14-gage wire, and yellow terminals fit 12- and 10-gage wire. |
| What is the maximum number of wire terminals that may be stacked on a single stud in a terminal strip? | Four. |
| What is the purpose of the shielding that is used to encase some electrical wires? | Shielding intercepts radiated electromagnet energy and carries it to ground so it will not interfere with any nearby sensitive electronic equipment. |
| Why must a switch be derated if it is used in a circuit controlling a DC electric motor? | The initial current flowing into a DC electric motor is much higher than the current the motor uses after the armature begins to rotate. Because of this high inrush current, the controlling switches must be derated. |
| What is used as the rectifier to produce direct current in a DC generator? | Brushes and a commutator. |
| How does a vibrator-type voltage regulator control the output voltage of a DC generator? | The contacts vibrate open and closed, putting the resistor in and out of the field circuit to control the amount of voltage the generator produces. |
| What is meant by paralleling the generators of a twin-engine aircraft? | Adjusting the voltage of the generators so they will share the electrical load equally. |
| What is meant by flashing the field of a DC generator? | Restoring the residual magnetism to the frame of a generator by passing battery current through the field coils in the same direction it flows when the generator is producing current. |
| What kind of rectifier is used in a DC alternator of the type that is used on most of the modern light airplanes? | A full-wave, three-phase rectifier made up of six silicon diodes. |
| What is used to maintain a constant frequency of the alternating current that is produced by an AC alternator driven by an aircraft turbine engine? | A hydraulic constant-speed drive unit between the engine and the alternator. |
| 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? | The voltage, the frequency, and the phase rotation of the generators. |
| What must be done to reverse the direction of rotation of the armature of a DC electric motor? | The current flow must be reversed through the armature or the field windings, but not through both of them. |
| Does a series-wound DC motor have a high or a low starting torque? | A high starting torque. |
| Which aircraft electrical circuit does not normally contain a fuse or circuit breaker? | The starter motor circuit. |
| When removing a battery from an aircraft, which connection should be removed first? | The ground connection must be disconnected first and connected last. |
| What is meant by the effective voltage of sine wave alternating current? | The value of the alternating current that is needed to produce the same amount of heat as this value of direct current. |
| What is a starter-generator that is used with many of the smaller gas turbine engines? | A single-engine-mounted component that serves as a starter for starting the turbine engine. When the engine is running, the circuitry can be shifted so it acts as a compound-wound generator. |
| When should aircraft wiring be installed in a conduit? | When the wiring passes through an area in the aircraft where open wiring could likely be damaged, such as through a wheel well. |
Created by:
Aima2019
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