Exam 16: Dc Generators

Two basic types of windings are in general use for DC generator armatures: the lap winding and the parallel winding.

When the coils move parallel to the magnetic lines of force, they produce the most voltage.

Armature core disks are commonly called ____.

The current decreases as the armature coils of a generator move through the ____ plane. Theoretically, the current drops to zero.

____ windings eliminate armature reaction.

In the past, ____ generators were used extensively for series arc lighting, particularly for street lighting.

In a(n) ____ generator, the magnetization current for the field coils is supplied from a source outside of the generator. This supply may be another DC generator, batteries, or a rectifier.

The stationary part of the generator is called the rotor.

A generator that maintains a nearly constant output voltage from no load to full load has excellent ____.

When magnetism is used to produce electricity, it makes no difference whether the conductor moves through the field or the magnetic field moves across the conductor.

A(n) ____ winding is used to obtain high current capacity.

A(n) ____ generator is a type of self-excited generator in which the field and armature are connected in parallel.

____ connect the commutator to the load conductors.

A commutator is a type of rotating switch that changes the connections to the load circuit at the same instant as the emf reverses in the armature.

When connecting compound generators in parallel, in order to prevent the possibility of unwanted load shifting, connect the series field of each machine to a common ____.