EMC Chapter 10 Flashcards
AC generators, also referred to as ___, convert mechanical energy into AC voltage and current.
alternators
Most generators use electromagnets, which must be supplied with ___.
resistance
Slip rings are metallic rings connected to the ends of an armature and are used to connect the induced voltage to the ___.
brushes
AC generators use slip rings to connect the ___ to the external circuit (load).
armature
The total voltage of a full rotation of an armature is ___ the voltage of each coil half.
twice
___-phase generators provide a more consistent voltage than single-phase generators.
Three
Each complete rotation of the ___ in a single-phase (one wire) AC generator produces one complete alternating current cycle.
armature
The output of a 3phase AC generator results in three output voltages ___degrees out of phase with each other.
120
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
The three ends of a wye-connected AC generator can be safely connected at the ___ point because no voltage difference exists between them.
neutral
Phase-to-phase voltage is also referred to as ___ voltage.
line
A(n)___ connection is a connection that has each coil end connected end-to-end to form a closed loop.
delta
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
___ switching is a process in which power is momentarily disconnected when switching a circuit from voltage supply (or level) to another.
Open circuit transition.
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
