Chapter 20
generator
"Alternator" is another name for an AC ___.
delta
A ___ connection is a connection that has each coil connected end-to-end to form a closed loop.
power quality meter
A ___ is a test instrument that measures, displays, and records voltage, current, and power, as well as power problems such as sags, swells, transients, and harmonics.
delta
A ____________connection is a parallel type connection.
wye
A ____________connection is a series type connection.
capacitors
A common method for correcting the power factor of a circuit is to connect ___ across the load.
increase current levels
A power-correcting capacitor does all of the following except ___.
wye
A(n) ___ 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.
rotor
A(n) ___ is a movable coil of wire in a generator that rotates relative to the magnetic field.
stator
A(n) ___ is a part of a generator that remains in a stationary position.
wattmeter
A(n) ___ is a test instrument that is used to measure true power in a circuit.
brush
A(n) ___ is the sliding contact that rides against the slip rings and is used to connect the armature to the external circuit.
KVA
AC generators are rated in ___.
more than
For 3Φ and 1Φ power systems to deliver the same amount of power to their respective loads, a 1Φ power system requires ___________the copper required for a 3Φ power system.
120 degrees
In a three-phase power system, the voltage of each conductor is ___ out of phase with that of the other conductors.
delta
Line current equals phase current X 1.732 in a ______________connection
wye
Line current equals phase current in a ______________connection
wye
Line voltage equals phase voltage X 1.732 in a ______________connection
delta
Line voltage equals phase voltage in a ______________connection
90
Maximum induced voltage occurs when the conductor cuts the field at ___°.
slip rings
Metallic rings that are connected to the ends of the armature and are used to connect the induced voltage to the brushes are known as ___ rings.
factor
Power ___ is the ratio of true power used in an AC circuit to apparent power delivered to the circuit.
1.732
When magnitudes are equal and 120° apart, the resultant vector can be obtained by multiplying one vector by ___.
45
When resistance equals inductive reactance in each phase, current lags source voltage by ___°.
excitation
___ current is the DC used to produce electromagnetism in the fields of a DC motor or generator or in the rotor of an AC generator.
