chapter 22
a cage rotor is sometimes referred to as a "squirrel-cage rotor".
True
A compensation winding iss an inductor used to reduce ____ reactance effects
armature
An ______ consists of a series of parallel copper or aluminum bars placed in slots on the rotor core
cage-rotor
_____ motor (dual-capacitor motor) uses two capacitors
capacitor start + run
An _______ switch opens to disconnect the starting winding when the rotor reaches a preset speed and reconnects when the speed falls below a set value
centrifugal
Magnetic polarity is based on the ______ of current flow
direction
A synchronous motor is a single phase motor that runs at synchronous speed.
false
If the centrifugal switch of a split-phase motor opens, the windings will overheat and destroy the motor
false
Repulsion motors should always be started from the soft neutral position
false
as slip increases, torque decreases
false
centrifugal switches are required in capacitor-run motors
false
shaded-p0le motors can have either a leading or lagging power factor, which makes them ideal for use in power factor correction
false
synchronous motors are self-starting
false
A salient pole that consists of a separate radial projection having its own iron pole and ____.
field core
An ______ position is a position where brushes are aligned directly with stator poles
hard neutral
the _____ method of reducing armature reactance us used with DC motors only
inductive
which of the following is not an advantage of a wound-rotor induction motor over a cage motor
lower initial cost
three-phase induction motors are typically used to turn _______ loads.
multiple horsepower
the windings of a split-phase motor are connected in
parallel
A(n) ______ motor is a motor with the rotor connected to the power supply through brushes that ride of the commutator
repulsion
A _____ pole is a single pole, normally made of a single turn of heavy-gauge copper wire, used for starting a single-phase motors
shaded
_____ is the difference between the synchronous speed and the actual speed of the motor
slip
A ______ neutral position is a position where the brushes are aligned 90 degrees from the stator poles
soft
______ motors are commonly used to operate washing machines, oil burners, small pumps, and blowers.
split-phase
A capacitor ____ motor has the most running torque of all the capacitor-style motors
start+ run
In the construction of a capacitor motor, a capacitor us connected in series with the _______ winding
starting
The armature of a motor will only turn when it is in the rotating magnetic field caused by the ____.
stator windings
____ is the theoretical speed of a motor based on line frequency and the number of poles of the motor
synchronous speed
A single phase induction motor is comparable to a transformer
true
In a hard neutral position, a rotating magnetic field is not present
true
a spilt-phase motor is a single-phase ac motor with a running winding and a starting winding,
true
changing any two connections of a three phase motor will cause the rotation of the magnetic field to reverse.
true
split-phase motors can operate with two separate voltages
true
An ________ motor is an AC series motor with brushes and a wound armature.
universal
the two types of rotors used on AC motors are the cage rotor and the _______ rotor
wound
Wound-rotor windings are typically ______-connected
wye
A variable resistance is connected in series with rotor windings of a wound rotor to limit inrush current
True
capacitor motors range in size from 1/8 HP to _____ HP
10
less maintenance is required for a single phase motor than for 3 phase motor
False
