Electrical Systems Flashcards
To what depth is the mica insulation between the commutator bolts of a dc generator undercut?
Equal to the width of the mica.
The purpose of a rectifier in an electrical system is to change
Alternating current to direct current.
Which of the following copper electrical cable sizes should be selected to replace a No.6 aluminum electrical cable?
No.6
If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open
Depends on the load carried by the generator.
Integrated drive generators (IDG) employ a type of high output ac generator that utilizes
A brushless system to produce current.
The voltage in an ac transformer secondary that contains twice as many loops as the primary use will be
Greater and the amperage less than in the primary
Major adjustments on equipment such as regulators, contactors, and inverters are best accomplished outside the airplane on test benches with necessary instruments and equipment. Adjustment procedure should be as outlined by
The equipment manufacturer.
The strength of the core of an electromagnet depends upon the material from which it is constructed and which of the following?
The number of turns of wire in the coil and the amount of current (amperes) passing through the coil.
The poles of a generator are laminated to
Reduce eddy current losses.
The pole pieces or shoes used in a dc generator a part of the
Field assembly.
If any one generator in a 24-volt dc system shows low voltage, the most likely cause is
An out-of-adjustment voltage regulator.
To test generator or motor armature windings for opens,
Place armature in a growler and connect a 110v test light on adjacent segments; light should light.
A battery-generator system provides direct current on installations requiring alternating current from the battery-generator system, it is necessary to have
An inverter
A certain switch is described as a single-pole, double-throw switch (SPDT). The throw of a switch indicates the number of
Circuits each pole can complete through the switch.
How are generators rated?
Amperes at rated voltage
CSD driven generators are usually cooled by
oIl spray
The circuit breaker in the instrument lighting system protects the
Wiring from too much current.
Some electric motors have two sets of field windings wound in opposite directions so that the
Motor can be operated in either direction.
During ground operation, aircraft generator cooling is usually accomplished by
An integral fan.
The primary considerations when selecting electric cable size are
Current-carrying capacity and allowable voltage drop.
What is required when operating two aircraft ac generators in parallel?
Frequency and voltage must both be equal.
The starting current of series-wound dc motor, in passing through both the field and armature windings, produces a
High starting torque.
In installations where the ammeter is in the generator or alternator lead, and the regulator system does not limit the maximum current that the generator or alternator can deliver, the ammeter can be redlined at what percent of the generator or alternator rating?
100
Why are the iron cores of most induction coils laminated?
To reduce the effects of eddy currents.