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