20.
SUMMARY. In this lesson the overhaul of the 40/60-ampere AC generator
was discussed. This included a description of the generator components and general
tests that are performed on generators.
a. Rotor checks were described. The checks were the field winding current,
sliprings, and ohmmeter checks for open and short circuits.
b. Stator checks were discussed.
The differences between the Wye (Y) and
Delta windings were covered.
c. Diode checks were also covered with respect to their connections to the
stator winding.
d.
The disassembly, inspection, testing, and repair was then discussed in
detail.
Note. - Review the exercise instructions in lesson 1.
EXERCISE
16.
The voltage output adjustment is found beneath the
a.
cover plate on the front housing.
b.
cover plate on the rear housing.
c.
pipe plug on the front housing.
17.
The rectifying diodes, sliprings, and brushes are exposed when the
a.
stator is removed.
b.
drive end housing is removed.
c.
rear end housing is removed.
18.
To check the generator output, the
a.
voltmeter is connected in series.
b.
ammeter is connected in parallel.
c.
ammeter is connected in series.
19.
Which statement is true?
a.
Voltmeters offer very high resistance
b.
Ammeters offer very high resistance
c.
Voltmeters offer very low resistance
20.
When testing the generator output, the variable load is connected in
a.
series with the battery.
b.
series with the voltmeter.
c.
parallel with the battery.
21.
With an ohmmeter connected between a slipring and the rotor shaft, a low
resistance reading indicates
a.
a shorted field winding.
b.
a grounded field winding.
c.
an open field winding.
OS 010, 2-P17
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