205a 205b true or false Flashcards
(29 cards)
Alternator belts shout be adjusted using a belt tension guage
T
Loose alternator brackets could cause a belt alignment problem which could offset the pulleys by more then 1mm in 20cm span
T *exam confirmed
a corroded battery cable could cause a v drop that would result in the battery being undercharged
t
wgeb testing for rated output of an alternator, it is best to use a carbon pile to load the system down
t
a new belt should be tensioned to at least 100 lbs
f manufacturers specifications
An alternator can only be rotated 1 way, if rotated backwards it will discharge the battery
F bi-directional
a swollen battery case could be result of over charging or a battery that was frozen
t
on a multiple battery setup one battery in poor condition could cause the other batteries to fail
t
a shorted rectifier diode will result in up to 70% loss in alternator output which could also drain the battery when the key is off
t
a diode being tested with a dmm reads 0.5v this would indicate that it is in forward bias
t
0v is reverse bias
Continuous headlight bulb failure could be an indicator of a faulty voltage regulator
t
by full fielding an alternator you could destroy the ecms
t - you are bypassing the voltage regulator
radio noise is due to interferance from the alternator fixable with a capacitor or could be due to an internal alternator problem
t
alternator maximum current output is limited by inductive reactance
t (think cemf)
Digital wave forms are in the form of a wave on a graph
f
the generator principal states when you cut magnetic lines of force with a conductor, you will induce a voltage into the conductor
t
alternators must supply enough current to operate all electrical loads
t
voltage regulators could be located in the ECM
t (voltage regulators control field circuit and the alternator)
the greatest induced voltage is when the magnetic field is at right angles to the stator winding
t
one cycle is called single phase DC voltage
f (AC voltage)
The voltage regulator switches the field circuit which will vary the magnetic field in the pole pieces
t
Delta and Y wound alternators both produce a 3 phase DC current
F (AC current always produced)
Forward bias diodes do not allow any current flow
f (allow 0.5v) reverse bias would be true
a capicitor is installed in parallel with the bat terminal on the alternator
t
