Ch. 14 AC Motors
The capacitor used in the starting winding gives a _____-______ motor high starting torque.
Capacitor-start
When starting a split-phase motor, both the running windings and the starting windings are ________ __ ______.
Connected in parallel
A ______ ______ may be used to determine the winding circuits on an unmarked motor by connecting one test lead to any motor lead and temporarily connecting the other test lead to each remaining motor lead.
Continuity tester
A dual-voltage, wye-connected motor has _______ separate circuits.
Four
The _________ of a motor should be grounded, especially if the motor is used in a damp location.
Frame
The maximum recommended acceleration time depends on the motor ________ size.
Frame
An electrician can observe the even blackening of all motor windings that occurs when a motor has failed due to _______.
Overloading
When a motor is first connected to power, the _____ of the starting windings is lower and the resistance is higher than the running winding.
Reactance
Some ________ motors include a thermal switch that automatically turns the motor off when it overheats.
Split-phase
A motor with a service factor of 1.0 is derated when it operates at altitudes above ___'.
3300
When a split-phase motor reaches approximately _____% of full speed, the centrifugal switch opens, disconnecting the starting winding from the circuit.
75
_______-______ motors that fail are usually replaced.
Shaded-pole
_______ the stator pole is the simplest method used to start a single phase motor.
Shading
The _____ is the stationary part of an AC motor.
Stator
To develop a rotating magnetic field in a 3 phase motor, the _____ ______ must be connected to the proper voltage level.
Stator windings
In a 3 phase motor, the leads that are brought out externally are labeled with a _____.
T
All capacitors are made with two conducting surfaces separated by _____ _______.
dielectric material
A __________- ________ motor has the starting winding and capacitor connected in series at all times.
Capacitor-run