Alternators and generator General text book

the DC alternator produces __________ phase AC which is then rectified

3 phases

How many diodes are used in the rectifier of a DC alternator?

6 diodes

A four- pole 1,800 rpm alternator will produce an output frequency of ________ Hertz

60 hertz

What causes a distortion in the magnetic field of a generator?

Armature reaction

What is the type of buses?

Battery bus, AC bus, standby bus, ground handling bus, DC bus, bus bar,

Carbon brushes

Blocks of carbon connected to a circuit. They press against slip rings to make an electrical connection between the circuit and the spinning coil in a generator.

Most of the AC generator used in the large jet-powered aircraft are of the___________ type

Brushless

The output voltage of a DC generator is transferred from the commutator to the generator terminal using_________ ________ which ride on the the surface of the commutator

Carbon brushes

Heavy duty generator system, will probably use a ______ ______ voltage regulator

Carbon pile

To obtain a direct current output from a generator, a rotating switch called__________ is used.

Commutator

To provide a constant frequency, many engine - driven AC generator is connected to the engine through a_______ __________ ____________

Constant speed drive

What's a generator?

Converts mechanical energy, into electrical energy

The direction of rotation of a generator may usually be found on the ______ ___________

Date plate

A DC alternator produces AC and then converts it to DC using__________

Diodes

How you convert AC to DC using a series of semi-conductor?

Diodes

Regulation of the voltage output of a generator is accomplished by varying the strength of the __________ current

Field current

The voltage produced by an alternator is regulated by varying the __________ ___________

Field current

Residual magnetism may be restored by _______________ the field

Flashing the field

The output of a DC alternator is________ wave rectified DC

Full

An ________ ________ _________ includes a constant speed drive unit in the housing with the generator.

Integrated drive generator

A pole placed between the main poles of a generator to counteract some of the effects of armature reaction is called _________________

Interpole

Where do you use Stater generator?

It may be used in small turbine engines instead of a separate starter and generator units.

For what do you use a growler?

It's used for testing the armature of a DC generator during overhaul

How High output aircraft alternators are normally rated in?

Kilo_ volt amps

When checking diodes using an ohmmeter, when the ohmmeter forward-biases the diode, it's resistance will be __________

Low

What is the position where the plane of two opposite coils is perpendicular to the magnetic field of the generator?

Neutral Plane

What is the bus?

Power source distribution system

What AC generator is rated in?

Volt-amps

An alternator voltage regulator needs which two units?

_ voltage regulator - overvoltage relay

What is the value of an induced EMF depends upon what three factors:

- The number of wires moved through the magnetic fields - Strength of the magnetic field - the speed of rotation

What are the three units of a three units voltage regulator?

- voltage regulator - current limiter - Reverse current cutout

The magnetism retained by the core of the field coils should be sufficient to produce a _________ _________ when the generator is turned at operating speeds.

Residual voltage

If the generator voltage falls below that of the battery, the ______________ _________ _____________ will the disconnect the generator from the battery.

Reverse current cutout

If a commutator is only slightly roughened, it may be smooth using________

Sandpaper

Which generator has a poor voltage regulation that it is never used as an aircraft generator?

Series wound

What is the three types of DC generators?

Series wound , shunt wound , compound wound

Medium duty generator used on aircraft are usually of the _____ wound type

Shunt wound

In a carbon- pile voltage regulator, the pressure on the carbon stack depends upon two opposing force. What are they?

Spring and electromagnet

The output of a DC alternator is taken from the _________

Stator

Alternating current has the advantage over direct current in that its voltage can be_____________ ___________

Stepped up or down