DC Generators
How is a shunt-wound DC generator connected?
Both fields are shunted across the armature.
What is the principal advantage of the series-wound DC motor?
High starting torque.
One advantage of using AC electrical power in aircraft is?
Greater ease in stepping the voltage up or down.
The purpose of a rectifier in an electrical system is to change?
Alternating current to direct current.
What is the minimum bend radius for an electrical wire bundle?
Ten times the outside diameter of the bundle.
Which type of DC generator is not used as an airplane generator?
Series wound.
A series-wound DC electric motor will normally require?
More current at low RPM than at high RPM.
What is the frequency of an alternator dependent upon?
RPM.
What is required when operating two aircraft AC generators in parallel?
Frequency and voltage must both be equal.
What should be used to protect wires from chafing when passing through bulkheads?
Suitable grommet.
What is the most common method of regulating the voltage output of a compound DC generator?
Vary the current flowing through the shunt field coils.
Which motor would be most likely to have an armature brake?
Landing light retraction motor
When operating two aircraft AC generators in parallel, what must be equal?
Frequency and voltage.
What is the most accurate type of frequency measuring instrument?
Integrated circuit chip having a clock circuit.
How should splices be arranged if several are located in a wire bundle?
Staggered along the length of the bundle.
What eliminates sparking to the brush guides in a generator?
The brush pigtail.
How can the direction of rotation of a DC electric motor be changed?
Reverse the electrical connections to either the field or armature windings.
How many cycles of AC voltage are produced in a six-pole alternator for each revolution?
Three.
What is the advantage of a circuit breaker compared to a fuse?
It is resettable and reusable.
What is the color and orientation of position lights for navigation on civil airplanes?
Left side: red; right side: green; rear aft: white.
What does the commutator of a generator do?
Changes alternating current produced in the armature into direct current.
Some electric motors have two sets of field windings wound in opposite directions so that the?
Motor can be operated in either direction.
The major advantage of alternating current over direct current is?
It can easily be increased or decreased by means of a transformer.
The voltage output of an alternator may be regulated by controlling the?
Voltage output of the DC exciter.
Electric wire terminals for most aircraft applications must be what type?
Ring.