Chapter 9 and 10

Today, with many components derated to save energy and operating cost, the range is normally?

5% to -10%

The high current shirt can turn into an ?

Arc Blast

Sustained power interruption are commonly results of ?

Blow fuses, or damaged equipment

____ connection that has each coil end connected end to end to form a closed loop?

Delta

What is a arc blast?

Explosion that occurs when the surrounding air becomes ionized and conductive.

Shunt-Wound generator has?

Field Windings connected in parallel ( shunt ) with the armature and the external circuit ( load )

Series-Wound Generator has its?

Field Windings connected in series with the armature and the external circuit( load )

What does a DC generator consist of ?

Field windings, Armature, Commutator, Brushes

The commutator segments reverse the connections to the brushes every ____?

Half-Cycle

Middle Finger points?

Induced Current

Uninterruptible power system is a power supply that provides constant on-line power when the primary power supply is ?

Interrupted

Dc power can be converted into AC using an ?

Inverter

_________ is the relationship between the current in a conductor and the magnetic field?

Left-Hand

Phase to Phase voltage is also referred as ?

Line Voltage

Voltage measured between the lines are known as ?

Line to Line voltage

What is generator?

Machine that converts mechanical enegry into electrical enegry by means of electromagnetic induction

Field Windings are electromagnets used to produce?

Magnetic Field

Index Finger points?

Magnetic Field

Permanent magnets are used in very small machines referred to as ?

Magnetos

In AC Slip Rings are________ connected to the ends of the armature and are used to connect the induced voltage to the brushes?

Metallic Rings

Thumb Points ?

Motion of the conductor

Armature is a _______ of wire in a generator that rotates through the magnetic field?

Movable Coil

Three ends can be safely connected at the ________point because, no voltage difference exists between them?

Neutral

Open circuit transition switching is a process in which _____ is momentarily disconnected when switching a circuit from one voltage supply to another?

Power

Output voltage of a series-wound generator may be controlled by?

Rheostat

Output voltage of a shunt-wound generator may be controlled by?

Rheostat

Pulsations in output voltage reduces ?

Ripples

If the generator itself supplies current for the field windings, the generator is referred to as _______ ?

Self-Excited

Compound-Wound is a generator that is connected in?

Series and Parallel

Three types of DC Generators are?

Series-Wound, Shunt-Wound, and Compound-Wound Generators

Transient voltage typically exist for very ____?

Short time

___________are two types of AC Generators?

Single & Three Phase

Three-Phase has ______ leads coming from the armature coils?

Six

AC generators uses _______ to connect the armature to the external circuit ( load ) ?

Slip Rings

Dc Generator dont have _____ but, AC have _____?

Slip Rings

Brushes are made of ?

Soft Carbon

_____ is a electrical device that provides protection from transient voltages by limiting the level of voltage allowed downstream from the surge suppressor?

Surge suppressor

Three-Phase generators have __________ armatures?

Three

Delta connected system permits different voltage.

True

_____ is used to show magnitude and direction. Also is another way to look at output voltage of a AC generator?

Vector

______ connection is a connection that has one end of each coil connected together and the other end of each coil?

Wye

AC generator doesnt have a ?

Commutator

AC power can be converted into DC using?

Converter

Voltage range is used because overvoltage is generally more damaging than?

Undervoltage

Strength of the voltage induced in one side of an _____ is always the same strength?

Armature

________Sliding contact that rides against the commutator segments or slip rings?

Brushes

____ is also referred as a voltage spike, is temporary, unwanted voltage in an electrical circuit?

Transient Voltage

Momentary power interruption can be caused when lighting strikes nearby.

True

Rated voltage is a voltage range that was normally 10%.

True

Total voltage of a full rotation of an armature is ______ the voltage of each coil half?

Twice

Three-Phase generators provide a more consistent _______ than single-phase Generators?

Voltage

In a single-phase AC generator the armature begins to rotate in clockwise direction there is no _____ and no ________ in the external (load) circuit because the armature is nit cutting across any magnetic lines of force (0° of rotation)

Voltage & Current

Three-Phase generators are either ___?

Wye or Delta connections

DC generators operate on the principle that when a coil of wire is rotated in a magnetic field, ______ is induced in the coil?

A voltage

Delta connected system has current flow of ______ ?

10A

_______ Ring made of segments that are insulated from one another?

Commutator

Three-Phase have three equally spaced armature windings _______ out of phase with each other?

120°

Automatic circuit breaker normally takes from ____ cycles to about 5 sec to close?

20

Magnetic Field used in a generator can be produced by ?

Permanent Magnets or Electromagnets

Voltage measured across a single winding or phase is known as a the?

Phase voltage

Series-Wound generators have ?

Poor voltage regulation

Momentary power interruption is decreased to ____ V on one or more power lines lasting from 0.5 cycles up to 3 sec?

0

Sustained power interruption is a decrease to 0v on all power lines for a period of more than ___ min?

1

Temporary power interruption is a decrease to 0v on one or more power lines lasting for more than 3 sec up to ____ min?

1

In a delta connected system back to the connection point shows that the _____ current supplied to the line is supplied by two coils?

Current

______ in the external circuit always flow in one direction?

Current

In delta connected systems, the voltage measured across any two lines is ________ to the voltage generated in the coil Winding?

Equal

Single-Phase generators have ________ armature?

One

AC generators are designed to produce a rated ?

Output Voltage