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23: Know and Understand
The introduction of _____-based battery packs has elevated the use of electric motors to operate certain cordless landscaping tools.
Electric motors change electrical energy into _____ energy.
The force of a motor’s rotation is influenced by the _____ of the input electric current and the strength of the magnetic fields.
_____ are used to support the rotating shaft of a heavy-duty electric motor.
Physical size and output _____ may be used as a method to group motors.
In a series-wound motor, the stator windings are connected in series with the armature, and in a(n) _____-wound motor, the stator windings are in parallel with the armature winding.
A four-pole split-phase motor powered by 60Hz AC current will turn at about _____ RPM under full load.
Once single-phase induction motors reach a designated speed, a(n) _____ switch disengages the starting circuit to allow the motor to operate on induction alone.
_____, which list critical motor data, are located on the outside of the motor housing where they are easily visible.
A belt-and-pulley system consumes about _____ of the power produced by an electric motor.
Circuit protection devices for motor circuits incorporate time-delay components that allow brief periods of overload needed for motor _____.
_____ protected electric motors have overload protection devices built into the construction of the motor.
Switching devices for electric motors often use an electromagnetic _____ to energize the motor circuit in order to handle significant current loads encountered during starting.
A variable frequency drive can be used to monitor and control the _____ of a three-phase electric motor.
Increasing the size of the driven pulley while using the same drive pulley will _____ the RPM of the equipment.
Belt _____ is measured and checked by deflecting the belt from its normal path at a given point using a specified amount of force.
Reversing the connections to the running windings will change the direction of rotation in split-phase and _____-start electric motors.
An excessive layer of dust on the outside of an electric motor is like a blanket that reduces the motor’s ability to dissipate _____.
_____ can lead to buildup of lumps of debris that interfere with proper operation of an electric motor.
Equipment using a belt and pulleys should be equipped with _____ to prevent accidental contact with the moving parts.
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