Electrical system part 2

The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a. double-pole, single-throw (DPST), two-position switch. single-pole, double-throw (SPDT), two-position switch. single-pole, single-throw (SPST), two-position switch.

When using the voltage drop method of checking circuit resistance, the. input voltage must be maintained at a constant value. output voltage must be maintained at a constant value. input voltage must be varied.

The rotor in a Magnesyn remote indicating system uses. a permanent magnet. an electromagnet. an electromagnet and a permanent magnet.

Aluminum wire must be stripped very carefully because. high resistance will develop in stripping nicks. stripping nicks can cause short circuits. individual strands will break easily after being nicked.

During inspection of the terminal strips of an aircraft electrical system, it should be determined that. only locknuts have been used for terminal attachment to the studs. the terminal studs are anchored against rotation. only plain nuts and lockwashers have been used for terminal attachment to the studs.

Which of the following are some uses for a DC selsyn system?. Indicate the position of retractable landing gear, cowl flaps position, cooler door position, fuel quantity, and position of wing flaps. Indicate the position of retractable landing gear, angle of incidence, and altitude. Indicate the fuel quantity, rate of climb, and position of wing flaps.

Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be. normal operation in vibration prone areas. a shorting hazard. acceptable operation.

The voltage output of an alternator may be regulated by controlling the. speed of the alternator. voltage output of the dc exciter. resistance in the rotor windings.

The overvoltage control automatically protects the generator system when excessive voltage is present by. opening the shunt field circuit. opening and resetting the field control relay. breaking a circuit to the trip coil of the field control relay.&&&&%'wer.

Which statement relating to electric wiring is true?. When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to-terminal joint is at least twice the tensile strength of the cable. When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to-terminal joint is at least equal to the tensile strength of the cable itself. All electric cable splices should be covered with soft insulating tubing (spaghetti) for mechanical protection against external abrasion.

Aircraft fuse capacity is rated in. volts. ohms. amperes.

In the American Wire Gauge (AWG) system of numbers used to designate electrical wire sizes, the number assigned to a size is related to its. combined resistance and current-carrying capacity. current-carrying capacity. cross-sectional area.

Electric wire terminals for most aircraft applications must be what type?. Slotted. Hook. Ring.

What is the color and orientation of the position lights for navigation on civil airplanes?. Left side, green; right side, red; rear aft, white. Left side, red; right side, green; rear aft, white. Left side, white; right side, green; rear aft, red.

To test generator or motor armature windings for opens,. place armature in a growler and connect a 110V test light on adjacent segments; light should light. check adjacent segments on commutator with an ohmmeter on the high resistance scale. use a 12/24V test light between the armature core segments and the shaft.

Where is the generator rating and performance data located?. In the Pilot Operating Handbook. Stamped on the generator data plate. In the Aircraft Maintenance Manual.

Which of the following copper electrical cable sizes should be selected to replace a No. 6 aluminum electrical cable?. No. 4. No. 6. No. 8.

What is the most accurate type of frequency measuring instrument?. Integrated circuit chip having a clock circuit. Electrodynamometers using electromagnetic fields. Electromagnets using one permanent magnet.

How should the splices be arranged if several are to be located in an electrical wire bundle?. Staggered along the length of the bundle. Grouped together to facilitate inspection. Splicing within wire bundles is not permitted.

How many cycles of AC voltage are produced in a six-pole alternator of the revolving-field type for each revolution of the rotor?. Four. Three. Six.

When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum number of splices permitted between any two connectors is. one. two. three.

What type of instrument is used for measuring very high values of resistance?. Megohmmeter. Shunt-type ohmmeter. Multimeter.

Static inverters are electronic devices that change DC to AC with the. use of an oscillator. properties of an exclusive OR gate. input from an amplifier control by integrated circuits.

The method most often used in overcoming the effect of armature reaction is through the use of. interpoles. shaded poles. drum-wound armatures in combination with a negatively connected series field.

What is an important factor in selecting aircraft fuses?. The current exceeds a predetermined value. The voltage rating should be lower than the maximum circuit voltage. Capacity matches the needs of the circuit.

In an AC circuit with no phase lead or lag, which is true?. Real power is zero. Real power is greater than apparent power. Real power equals apparent power.

Which of the following statements is true?. An AC selsyn system is a widely used electrical method of indicating a remote mechanical movement or position. A resistance-type indicating system is an electrical system used for transmitting information from one point to another. A synchro-type indicating system is an electrical system used for transmitting information from one point to another.

CSD generators are usually cooled by. oil spray. an integral fan. both ram air and an integral fan.

When a diode is checked for an open circuit or a short circuit, it should be. in the circuit. checked with a milliamp ammeter. disconnected from the circuit.

The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily. to prevent circuit failure due to terminal disconnection. for uncomplicated and rapid circuit connection and disconnection. for permanent connection to the circuit.

How does the magnetic brake used to stop rotation of an electric motor armature operate?. Centrifugal force releases a rotating brake cog from a stationary notch when the armature reaches a certain speed and magnetic force re-engages the cog when the electrical power is turned off. A friction brake is applied by a magnet and released by a spring. A friction brake is applied by a spring and released by a magnet.

How can the direction of rotation of a DC electric motor be changed?. Interchange the wires which connect the motor to the external power source. Reverse the electrical connections to either the field or armature windings. Rotate the positive brush one commutator segment.

In installations where the ammeter is in the generator or alternator lead, and the regulator system does not limit the maximum current that the generator or alternator can deliver, the ammeter can be redlined at what percent of the generator or alternator rating?. 50. 75. 100.

If a wire is installed so that it comes in contact with some moving parts, what protection should be given the wire?. Wrap with soft wire solder into a shield. Wrap with friction tape. Pass through conduit.

(Refer to Figure 19.) Upon completion of the landing gear extension cycle, the green light illuminated and the red light remained lit. What is the probable cause?. Short in the down limit switch. Short in the gear safety switch. Short in the up limit switch.

Which of the following is not one of the purposes of interpoles in a generator?. Reduce field strength. Overcome armature reaction. Reduce arcing at the brushes.

When adding a rheostat to a light circuit to control the light intensity, it should be connected in. parallel with the light. series with the light. series parallel with the light switch.

What protection to wires and cables does conduit provide when used in aircraft installations?. Electromagnetic. Mechanical. Structural.

Certain transport aircraft use AC electrical power for all normal operation and battery furnished DC electrical power for standby emergency use. In aircraft of this type that operate no DC generators, the batteries are kept charged by. inverters which use the aircraft's AC generators as a source of power. alternators which use the aircraft's generators as a source of power. rectifiers which use the aircraft's AC generators as a source of power.

What is the minimum bend radius for an electrical wire bundle?. Ten times the outside diameter of the bundle. Five times the outside diameter of the bundle. Fifteen times the outside diameter of the bundle.

A voltage regulator controls generator voltage by changing the. resistance in the generator output circuit. current in the generator output circuit. resistance of the generator field circuit.

If the (+) terminal of a voltmeter is connected to the (-) terminal of the source voltage and the (-) terminal of the meter is connected to the (+) terminal of the source voltage, the voltmeter will read. correctly. low voltage. backwards.

The purpose of a rectifier in an electrical system is to change. the frequency of alternating current. direct current to alternating current. alternating current to direct current.

What does a rectifier do?. Changes direct current into alternating current. Changes alternating current into direct current. Reduces voltage.

Electrical connectors used in the aircraft assemblies should meet which of the following specifications?. Parts Manufacturer Approval (PMA). Military Specifications (MS). Society of Electrical Specifications (SES).