Single-phase Motors
used in capacitor motors
AC capacitors are ____
TRUE
Alternating current is usually generated and distributed as 3 OHM power.
locked rotor torque
___ torque is the torque a motor produces when the rotor is stationary and full power is applied to the motor.
centrifugal
_____ force moves rotating bodies away from the center of rotation.
FALSE
The magnetic field of 1 OHM motor produces poles on the rotor, which are the same polarity as the stator poles
Shading
The simplest method used to start a 1 phase motor is by ___ the stator poles
75-200
The starting torque of a split-phase motor is ___% of the full-load torque.
centrifugal
The stating winding of a split-phase motor is removed by a ____ switch as the motor accelerates.
Alternating
______current reverses its direction of flow twice per cycle.
TRUE
Ambient temperature is the temperature of the air around a piece of equipment.
thermal switch
An __ switch operates its contacts when a preset temperature is reached.
115/230
A 1 OHM, dual-voltage, split-phase motor typically is set for _____ V.
190-260
A 1/2 HP capacitor motor requires a capacitor with a value of ___ UF.
4
A 1725 rpm motor (1800 rpm synchronous speed) has a slip of approximately ___ %
90
A ___ degree phase difference is required to produce maximum starting torque in a split-phase motor.
5
A capacitor may be discharged by placing a 20,000 ohm, 5 W resistor across the terminals for ___ seconds.
TRUE
A dual-voltage motor develops the same amount of power for either voltage.
TRUE
A good capacitor will hold a charge even when power is removed.
low
A shaded-pole motor has ___ staring torque
TRUE
A split-phase motor can run on one or more phase
start
A split-phase motor has a ___ winding.
TRUE
A starting method is required to start a 1 OHM motor
cycles
Line frequency is the number of ___ supplied voltage per second.
Capacitor
An ____ is a device that stores an electric charge.
FALSE
A two-speed, split-phase motor is commonly wound to run on either two or four poles.
stator
An ____ is the stationary part of a motor to which the power is directly connected.
series
An ___connection provides only one path for current flow.
50
In a split-phase motor, the main winding current lags the applied voltage by about __%
closed
In normal operation, a thermal switch is in the ___ position.
FALSE
Inductive reactance is the flow of alternating current in a circuit caused by inductance.
Cycles
Line frequency is the number of ___ supplied voltage per second.
TRUE
Many 1 OHM motors can be connected for either of two voltages
Single phase power
Many small businesses and almost all dwellings operate on ___ -phase power.
2 HP to 5 HP
Shaded-pole motors are commonly ___
TRUE
Shaded-pole motors that fail are usually replaced.
1/2
Split-phase motors are generally available in sizes ranging from 1/3- HP to ___ HP.
rotor
The ____ is the rotating part of a motor.
two
The capacitor start -and-run motor uses __ capacitors.
TRUE
The capacitor-run motor leaves that starting winding and capacitor in the circuit at all time
connected in parallel with the run winding
The centrifugal switch of a split-phase motor is _____
115/230
The dual-voltage rating of 1 phase motors is usually ___V.
reversing the start winding connections
The industrial standard for reversing the direction of rotation of the 1 OHM motor is ___
FALSE
When a capacitor is open, the motor has good starting torque
inductive reactance of the start winding is lower than the run winding
When a split-phase motor is first connected to power, the ___.
Auditable click
When a split-phase motor is turned off, a distinct ___ should be heard.
Ampacity
___ is the amount of current for which a conductor or device is rated.
torque
___ is the force that produces rotation in a motor.
Frequency
___ is the number of complete electric cycles per second.
polarity
___ is the positive or negative state of an object.
