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