Tech-Check: Ch.10 AC Generators

A momentary power interruption is a decrease to 0 V on one or more power lines lasting from 0.5 cycles up to ___ sec.

(( 3 ))

Voltage between any two lines in a wye-connected AC generator is ___ multiplied by any of the individual phase voltages.

1.73 (√3)

The output of a 3Φ AC generator results in three output voltages ___° out of phase with each other.

120

___ switching is a process in which power is momentarily disconnected when switching a circuit from one voltage supply (or level) to another.

Open circuit transition

___-phase generators provide a more consistent voltage than single-phase generators.

Three

AC generators, also referred to as ___, convert mechanical energy into AC voltage and current.

alternators

AC generators use slip rings to connect the ___ to the external circuit (load).

armature

Each complete rotation of the ___ in a single-phase (one wire) AC generator produces one complete alternating current cycle.

armature

Slip rings are metallic rings connected to the ends of an armature and are used to connect the induced voltage to the ___.

brushes

Most generators use electromagnets, which must be supplied with ___.

current

A(n) ___ connection is a connection that has each coil end connected end-to-end to form a closed loop.

delta

For long-term power interruption protection, a ___ is used.

generator/UPS

Phase-to-phase voltage is also referred to as ___ voltage.

line

The three ends of a wye-connected AC generator can be safely connected at the ___ point because no voltage difference exists between them.

neutral

In a delta-connected system, ___ of the three wires are normally connected to ground.

none

A ___ power interruption is a decrease to 0 V on one or more power lines lasting for more than 3 sec up to 1 min.

temporary

A surge suppressor is an electrical device that provides protection from ___ voltages by limiting the level of voltage allowed downstream from the surge suppressor.

transient

The total voltage of a full rotation of an armature is ___ the voltage of each coil half.

twice

Following any line in a delta-connected system back to the connection point shows that the current supplied to that line is supplied by ___ coil(s).

two

A ___ connection is a connection that has one end of each coil connected together and the other end of each coil left open for external connections.

wye