AC Electrical and Ignition System - Prelim

torque

The force that produces rotation

the strength of the magnetic field, the number of turns on the coil, and the position of the coil in the field

The amount of torque developed in a coil depends on several factors including ___

split field motor

One method for reversing the direction of rotation employs two field windings wound in opposite directions on the same pole.

dc motor

is a rotating machine that transforms direct-current electrical energy into mechanical energy.

rheostat

is used to control the speed of shunt motor and it is connected in series with the field winding.

split field method

______ is the process of reversing the direction of rotation employs two field windings wound in opposite directions on the same pole.

switch field method

this type of motor reversal employs a double-pole, double-throw switch that changes the direction of current flow in either the armature or the field.

copper losses

occur when electrons are forced through the copper armature and field windings.

hysteresis losses

result from the armature revolving in an alternating magnetic field and becoming magnetized in two directions.

eddy current losses

occur because the armature's iron core acts as a conductor revolving in a magnetic field.  

air cooled

The AC alternators used in large jet-powered aircraft are of the brushless type and are usually ____

constant speed drive

_____ is used to ensure the alternator rotates at the correct speed to ensure a 400-Hz frequency

ampere hours / amp hours

Capacity is measured in ____

clean and tight

One of the most important aspects of battery servicing is keeping the battery____

three

how many types of dc generators are there?

battery

converts chemical energy into electricity it is consists of one or more voltaic cells connected in series.

lead -acid battery

has traditionally been the most popular type used in smaller aircraft.

Nickel-Cadmium or Ni-Cad Battery

has a very distinct advantage that its internal resistance is very low, so its voltage remains constant until it is almost totally discharged.

rectifier

____ in an electrical system change alternating current (AC) to direct current (DC).

Capacity of Battery

a battery’s ability to produce a given amount of current for a specified time.

Electricity

______________ is the electromagnetic induction movement of electrons through wires (conductors) to create an electric current.

Field Coil

______ is the magnetizing force inside a generator is produced by an electromagnet consisting of a wire coil.

Armature Reaction

_____ is the distortion of lines of magnetic flux between the poles of the generator.

Electric, Mechanical

Frame has two primary functions: 1) It completes the ____ circuit between the poles, and 2) It acts as a ____ support for the other parts.

Voltage Regulator

____ is used to control generator output voltage.

Reverse-Current Relay

the third unit of a three-unit regulator is used to prevent current from leaving the battery and feeding the generator.

DC Alternators

____ have the same function as DC generators

DC Generators

DC alternators are lighter and more efficient than ____

electrical components

When installed on most aircraft, the output of a generator typically flows to the aircraft's bus bar where it is distributed to the various

60, 48

If an aircraft has a __ amp generator installed, the maximum continuous load that can be placed on the electrical system is __ amps.

generator control system

______ is designed to keep the generator output within limits for all flight variables.

generators magnetic field strength

Aircraft generator output can easily be adjusted through control of the _____

Over Voltage Protection

The _____ system compares the sampled voltage to a reference voltage.

Close tolerance

This function of a control system is designed to ensure all generator voltage values are within ______ before being connected to the load bus

Typical Generator

A _____ control circuit for low-output generators modifies current flow to the generator field to control generator output power.