Chp 17 Electrical Systems

Question 1

What are the two types of current electricity

Answer 1

Alternating current

Direct current

Question 2

Electricity produced by Magnetism is?

Answer 2

Alternating current

Question 3

What determines the current flow as a result of magnetism induction?

Answer 3

Strength of the magnetic field
The number of conductors passing through the field
Speed with which field is crossed

Question 4

A generator in which slip rings and brushes carry the current from the armature produces?

Answer 4

Alternating current

Question 5

When a conductor is moving parallel to lines of magnetic flux, the current in the conductor is?

Answer 5

At its minimum

Question 6

The electricity produce from the armature coils of the DC generator is

Answer 6

Alternating current

Question 7

A generator in which a communator and brushes carry the current from the armature produces?

Answer 7

Direct current

Question 8

The current that flows in a DC generator field coil is taken from the?

Answer 8

Generator armature

Question 9

The magnetism for producing in the initial excitation current in a DC generator is?

Answer 9

Residual magnetism in the generator frame

Question 10

The voltage produced by a generator when no field current is flowing is?

Answer 10

Residual voltage

Question 11

Residual voltage in a DC generator is approximately how many volts or less?

Answer 11

2 V

Question 12

Residual voltage is lost when a generator is disassembled it is restored by what?

Answer 12

Field flashing

Question 13

When flashing the field of a DC generator current is directed through the field coils in the blank direction as normal flow?

Answer 13

Same direction

Question 14

In a shunt connected DC generator the field coils are in what with the Armature?

Answer 14

Parallel

Question 15

In a compound wound DC generator the voltage regulator Is in the blank field?

Answer 15

Shunt field

Question 16

The core of the armature used in a DC generator is made up of what?

Answer 16

Laminated soft iron

Question 17

The position of the armature in a DC generator in which there is no potential difference between the ends of the adjacent coils is called the blank and blank

Answer 17

Neutral position or neutral plate

Question 18

The neutral plane of an uncompensated DC generator shifts as the blank current changes

Answer 18

Armature

Question 19

The brushes of a DC generator are located in the neutral plane to minimize what?

Answer 19

Brush arcing

Question 20

What is magnetic flux

Answer 20

Lines used to represent a magnetic field

Question 21

What is magnetic field

Answer 21

The invisible but measurable force surrounding a permanent magnet or current carrying conductor

Question 22

What is a slip ring 

Answer 22

A smooth continuous ring of brass or copper mounted on the rotor shaft of an electrical generator or alternator. Brushes riding on the smooth surface of the slippering carry current into and out of the rotor coil

Question 23

What is a rectifier

Answer 23

A device that allows electrons to flow in one direction while preventing their flow in the opposite direction

Question 24

What is a commutator

Answer 24

A mechanical rectifier mounted on the armature shaft of the DC generator. Carbon brushes riding on the commutator carry current into and out of the armature

Question 25

What is Pulsating DC

Answer 25

Direct current who voltage periodically changes, but who’s electrons flow in the same direction all of the time

Question 26

Note

Answer 26

A DC generator produces alternating current, but is rectified by the commutator and brushes before leaving the generator

Question 27

What is a permanent magnet

Answer 27

A piece of hardened steel that has been exposed to a strong magnetizing force which has aligned the spin axis of the electrons surrounding its atoms

Question 28

What is an electromagnet

Answer 28

A magnet produced by an electrical current flowing through a coil of wire

Question 29

What is residual magnetism

Answer 29

The magnetism that remains in the field frame of a generator when no current is flowing through the field coils

Question 30

What is residual voltage

Answer 30

The voltage produced in a generator armature when the armature is rotated in the residual magnetism

Question 31

What is flashing the field

Answer 31

A maintenance procedure that restored residual magnetism to a DC generator field frame

Question 32

What is a short circuit

Answer 32

A low resistant connection between two points in electric circuit

Question 33

What are the three types of field generators

Answer 33

Sorties Shunt Compound

Question 34

What is a slow blow fuse

Answer 34

A special type of circuit protection device that allows a momentary flow of excess current, but opens the circuit if the excess flow is sustained

Question 35

What is a current limiter

Answer 35

Pass a momentary excess of current, but if the circuit uses more than the generators rated current for an extended period of time, a fuse will sever and protect the component

Question 36

Reverse current cut out and switch

Answer 36

Protects the generator from acting as a motor is the battery voltage is higher than the generators voltage

Question 37

Carbon pile voltage regulator

Answer 37

A voltage regulator for a high output dc generator that uses a stack of pure carbon disk for the variable resistance element

Question 38

What are the three primary advantages of dc alternators of ax

Answer 38

More sets of field poles produce current at a lower speed. High current produced in stationary component is rectified by semi conductors diodes An alternator charging system is lighter weight than a generator charging system

Question 39

What is the rotor of a dc alternator composed of

Answer 39

Coils and poles

Question 40

What is distributed pole stator winding

Answer 40

Alternator stator windings wound in a sieries of slots in the stator frame

Question 41

What’s the two parts of a dc alternator

Answer 41

Rotor and stator

Question 42

What’s transformed ac power to dc power

Answer 42

Transformer rectifier

Question 43

What is a constant speed drive

Answer 43

Component mounted between an ac generator and an aircraft engine that holds the generator speed and frequency constant as the engine varies through its normal operating state

Question 44

Inverter make up

Answer 44

28 volt 115 volt 3 phase and 400 hertz