ENGINE ELECTRICAL PART 2

Which of the following Federal Aviation Regulations require that all aircraft using fuses as the circuit protective devices carry 'one spare set of fuses, or three spare fuses of each kind required'?. 14 CFR Part 23. 14 CFR Part 43. 14 CFR Part 91.

What type of lubricant may be used to aid in pulling electrical wires or cables through conduits?. Silicone grease. Soapstone talc. Rubber lubricant.

(Refer to Figure 4.) In a 28-volt system, what is the maximum continuous current that can be carried by a single No. 10 copper wire 25 feet long, routed in free air?. 20 amperes. 35 amperes. 28 amperes.

The maximum allowable voltage drop between the generator and the bus bar is. 1 percent of the regulated voltage. 2 percent of the regulated voltage. less than the voltage drop permitted between the battery and the bus bar.

What device is used to convert alternating current, which has been induced into the loops of the rotating armature of a DC generator, to direct current?. A rectifier. A commutator. An inverter.

The maximum number of terminals that may be connected to any one terminal stud in an aircraft electrical system is. two. three. four.

As the generator load is increased (within its rated capacity), the voltage will. decrease and the amperage output will increase. remain constant and the amperage output will increase. remain constant and the amperage output will decrease.

What are two types of AC motors that are used to produce a relatively high torque?. Shaded pole and shunt field. Shunt field and single phase. Three-phase induction and capacitor start.

Aircraft copper electrical wire is coated with tin, silver, or nickel in order to. improve conductivity. add strength. prevent oxidization.

What is the maximum number of bonding jumper wires that may be attached to one terminal grounded to a flat surface?. Two. Three. Four.

Generator voltage will not build up when the field is flashed and solder is found on the brush cover plate. These are most likely indications of. an open armature. excessive brush arcing. armature shaft bearings overheating.

Which of the following statements is true?. Alternators are rated in volt-amps, which is a measure of the apparent power being produced by the generator. Alternators are rated in watts, which is a measure of the apparent power being produced by the generator. Direct current has the advantage over alternating current in that its voltage and current can easily be stepped up or down.

What type of electric motor is generally used with a direct-cranking engine starter?. Direct current shunt-wound motor. Direct current series-wound motor. Synchronous motor.

What is the ampere-hour rating of a storage battery that is designed to deliver 45 amperes for 2.5 hours?. 112.5 ampere-hour. 90.0 ampere-hour. 45.0 ampere-hour.

Which of the following statements is true?. Electrical circuit protection devices are rated based on the amount of voltage that can be carried without overheating the circuit breaker. Electrical circuit protection devices are rated based on the amount of current that can be carried without overheating the wiring insulation. A trip-free circuit breaker makes it possible to manually hold the circuit closed when excessive current is flowing.

What speed must an eight-pole AC generator turn to produce 400 hertz AC?. 400 RPM. 1,200 RPM. 6,000 RPM.

Which of the following statements is true?. Most modern aircraft use circuit breakers rather than fuses to protect their electrical circuits. Part 23 requires that all electrical circuits incorporate some form of circuit protective device. Most modern aircraft use fuses rather than circuit breakers to protect their electrical circuits.

What is the purpose of a reverse-current cutout relay?. It eliminates the possibility of reversed polarity of the generator output current. It prevents fluctuations of generator voltage. It opens the main generator circuit whenever the generator voltage drops below the battery voltage.

Which of the following aircraft circuits does NOT contain a fuse/circuit breaker?. Generator circuit. Air-conditioning circuit. Starter circuit.

According to the electron theory of the flow of electricity, when a properly functioning DC alternator and voltage regulating system is charging an aircraft's battery, the direction of current flow through the battery. is into the negative terminal and out the positive terminal. is into the positive terminal and out the negative terminal. cycles back and forth with the number of cycles per second being controlled by the rotational speed of the alternator.

Which of the following statements is true?. Electrical wires larger than 10 gauge use uninsulated terminals. Electrical wires smaller than 10 gauge use uninsulated terminals. Electrical wires larger than 10 gauge use insulated terminals.

Arcing at the brushes and burning of the commutator of a motor may be caused by. weak brush springs. excessive brush spring tension. low mica.

The part of a DC alternator power system that prevents reverse flow of current from the battery to the alternator is the. reverse current relay. voltage regulator. rectifier.

How many basic types of circuit breakers are used in powerplant installation electrical systems?. Two. Three. Four.

The resistance of the current return path through the aircraft is always considered negligible, provided the. voltage drop across the circuit is checked. generator is properly grounded. structure is adequately bonded.

Electric motors are often classified according to the method of connecting the field coils and armature. Aircraft engine starter motors are generally of which type?. Compound. Series. Shunt (parallel).

The most effective method of regulating aircraft direct current generator output is to vary, according to the load requirements, the. strength of the stationary field. generator speed. number of rotating armature loops in use.

When installing electrical wiring parallel to a fuel line, the wiring should be. below the fuel line. beside the fuel line. above the fuel line.

Electrical circuit protection devices are installed primarily to protect the. switches. units. wiring.

Why is it unnecessary to flash the field of the exciter on a brushless alternator?. The exciter is constantly charged by battery voltage. Brushless alternators do not have exciters. Permanent magnets are installed in the main field poles.

A high surge of current is required when a DC electric motor is first started. As the speed of the motor increases,. the counter EMF decreases proportionally. the applied EMF increases proportionally. the counter EMF builds up and opposes the applied EMF, thus reducing the current flow through the armature.

Aircraft electrical wire is manufactured in sizes according to a standard known as. American Wire Gauge (AWG). Military Specification (MS). Technical Standard Order (TSO).

The reason for flashing the field in a generator is to. restore residual magnetism to the field frame. ensure proper operation of the capacitor. relieve the unit of any residual electrical energy.

The stationary field strength in a direct current generator is varied. by the reverse-current relay. because of generator speed. according to the load requirements.

When installing an electrical switch, under which of the following conditions should the switch be derated from its nominal current rating?. Conductive circuits. Capacitive circuits. Direct current motor circuits.