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AMT112 FINAL EXAM QUESTIONS AND ANSWERS
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AMT112 FINAL EXAM QUESTIONS ANDANSWERS
A voltage regulator controls generator output voltage by. - Answer Varying current flow
to generator field coil
To what depth is the mica insulation between the commutator bars of a DC generator
undercut? - Answer Equal to the width of mica
What types of armature are used in DC generator? - Answer Ring and drum
To test generator armature windings for opens. - Answer Place armature in a growler
and connect a 110 volt test light on adjacent segments; light should light
Which of the following is NOT one of the purposes of interpoles in a generator? - Answer
Reduce field strength
An ammeter in a battery circuit is for the purpose of indicating. - Answer Rate of current
used to charge battery
Under what circumstances would you flash a DC generator field? - Answer When a
replacement generator is being installed
Armature reaction is proportional to the. - Answer Load on the generator
If the reverse current cutout relay contact points fail to open after the generator output
has dropped below battery potential, current will flow through the generator armature. -
Answer Opposite the normal direction and through the shunt field in the normal
direction
,The pole pieces or shoes used in DC generator are a part of the. - Answer Field
assembly
In practice the only method of maintaining constant voltage output from an aircraft
generator under all conditions of varying speed and loads is by variation in the.-Answer
Strength of magnetic field
What is the purpose of the brush pigtails? -Answer Prevent arcing between brush and
brush holder
One of the most satisfactory methods of overcoming the effect of armature reaction is
through the use of. -Answer Interpoles
The reverse current cutout relay contact points will close when the generator voltage
reaches a value just above the battery voltage. The points are CLOSED by. - Answer The
action of the voltage coil located in the reverse current cut out relay
What is the cause of generator brush arcing? - Answer Low spring tension
If a generator is equipped with a vibrator type voltage regulator, the actual time the
voltage regulator points remain open. - Answer Depends on the load carried by the
generator
If a short circuit occurs between the positive armature lead and the field lead of a shunt
generator which has the voltage regulator located in the positive side of the field circuit,
the. - Answer Generator voltage will increase
A growler test is done for the purpose of determining the presence of. Answer A shorted
armature
The rating of a generator may usually be found stamped on the. Answer Generator
, The poles of a generator are laminated to. Answer Reduce eddy current losses
A shunt wound DC generator is connected Answer The field and armature are in parallel
Generators are rated Answer Amperes at rated voltage
Which of the following switches below connects the generator to the main bus bar in the
electrical system when the generator output exceeds the bus voltage by .35 to .65 volts?
- Answer Differential type relay
If in a 24-volt system with a properly adjusted voltage regulator, the instrumental panel
voltmeter indicates 10 to 15 volts, the trouble is most likely in. - Answer Generator
circuit or reverse current circuit
The most common method of regulating the voltage output of a compound DC generator
is to vary the. -Answer Current flowing through the shunt field coils
When DC generators are operated in parallel to supply power for a single load, their
controls include an equalizer circuit to assure that all generators share the load equally.
The equalizer circuit operates by. - Answer Increasing the output of the low generator
and decreasing the output of the high generator until they are equal
The overvoltage control automatically protects the generator system in case of
excessive voltage is present by. - Answer Opening the shunt field circuit
A voltage regulator controls generator voltage by changing the. - Answer Resistance of
the generator field circuit
When checking the continuity of a generator field coil with an ohmmeter, the coil should.
- Answer Show very little resistance if it is a series field
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