Unit 32 Quiz reviews Flashcards
The revolving type of alternator is capable of
less power
Revolving field type alternator have what type of power
More power
What alternator is used less because lower power output?
Revolving armerture
Connection to an armature is done by
sliprings
The non rotation part of a alternator is called
Stator
What is the rotating part of an alternator
Rotor
The direct current that is an input to the alternator rotor?
The excitation current
An alternator that have a separate small alternator mounted on the rotor is equip with an
brushless exciter
The main type of cooling an alternator are
Air and Hydrogen
In order to increase the efficiency some alternator operate in the atmosphere of
hydrogen
the output frequency of an alternator is control by the
Number of stator poles
The speed of the rotation of the rotor
what is the formula for frequency
Eac…
8x900/120=60
8x1500/120=100
f=ps/120
on the formula for frequency what is the 120 represent?
120 degrees phase
f=ps(phase shift)/120
phase time rpm=frequency
If one alternator does not produce sufficient power to supply the load another alternator can be add to supply the load the second alt is connected how?
in parallel
What do we used to measure voltage and frequency between two alternator
synchroscope
