Generators 1
What depends on the load carried by the generator equipped with a vibrator-type voltage regulator?
The actual time the voltage regulator points remain open.
Low spring tension causes what in a generator?
Brush arcing
Amperes at rated voltage
High starting torque is the principal advantage of what kind of motor?
What changes AC into DC?
A rectifier
A shorted armature is one reason to use this kind of test.
Growler Test
What copper cable size should be used to replace a No. 6 aluminum cable?
No. 6
The pole pieces or shoes in a DC generator are a part of the armature assembly.
True or False?
False
They are a part of the field assembly.
The brush pigtail eliminates what in a generator?
One field is shunted across the other in a shunt-wound DC generator.
True or False?
False
Both fields are shunted across the armature.
How can some electric motors be operated in either direction?
Have two sets of field windings wound in opposite directions.
Two minutes is the max time a circuit can be in operation and still be what?
An intermittent duty circuit.
DC stator field current controls the output voltage on what?
An Inductor-type Inverter
When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to-terminal joint is at least equal to two times the tensile strength of the cable itself.
True or False?
False
It should be at least equal to the tensile strength of the cable.
Varying the strength of the magnetic field is the only practical method of maintaining what from an aircraft generator under varying conditions of speed and load?
constant voltage output
To what depth is the mica insulation between the commutator bars of a DC generator undercut?
Equal to the width of the mica.
The poles of a generator are laminated to do what?
Reduce Eddy current losses
A Landing Light Retraction Motor most likely has this component.
An armature brake.
What should be disconnected from the circuit to test for an open or a short?
A diode
What should be fully discharged before removing it from a circuit?
A high-voltage capacitor
When should suitable grommets be used to protect wires from chafing?
When they pass through bulkheads, firewalls, ribs, etc.
What changes current from AC as it's produced in the armature into DC as it's taken out of the armature of a generator?
The Commutator.
Generator cooling is usually accomplished by what?
An integral fan.
What is stamped on the generator data plate?
Generator rating and performance data.
A series-wound DC electric motor.
Greater ease in stepping the voltage up or down is an advantage of what?
Using AC electrical power in an aircraft
What would cause a voltmeter connected to the generator output to read residual voltage?
The positive field lead between a generator and a generator control panel breaks and is shorted.
The input voltage must be maintained at a constant value to use what method for checking circuit resistance?
Voltage Drop Method
What is the purpose of interpoles in a generator?
2) Reduce arcing at the brushes
3) Increase field strength
Why are series wound DC generators not used as aircraft generators?
It is difficult to regulate and control the output voltage.
An out-of-adjustment voltage regulator is the most likely cause to what in a generator in a 24-volt DC system?
Low voltage
A friction brake is applied by a _____ and released by a _____ to stop rotation of an electric motor armature.
Spring; magnet
Oil spray is used to cool what kind of generator?
CSD generators
The voltage and amperage in the AC transformer secondary that contains twice as many loops as the primary will be what?
Amperage - Less than the primary
Copper jumpers are used to bond what kind of aircraft components?
Noncontinuous stainless steel aircraft components.
Current will flow through the generator armature __________ and through the shunt field in __________ if the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential.
Opposite the normal direction; the normal direction
How does an equalizer circuit operate when DC generators are operated in parallel to supply power for a single load?
By increasing the output of the low generator and decreasing the output of the high generator until they are equal.
What two things must be equal in order to operate two aircraft AC generators in parallel?
Frequency and Voltage
In the series motor, the field windings, consisting of relatively few turns of heavy wire, are connected in parallel with the armature winding.
True or False?
False
The field windings are connected in series with the armature winding.
What uses an oscillator to change DC to AC?
Static inverters
What provides mechanical protection to wires and cables in aircraft installations?
Conduit
The rotor is the basic difference between which two indicating systems?
Autosyn and Magnesyn