Electromag

A shaded pole motor has one start winding.

• True

• False

Answer explanation

A shaded pole motor has multiple start windings, known as shading coils at the corner each pole that helps start the motor.

What is the electrical symbol of a shaded pole motor?

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• 
• 
• 
• 

Answer explanation

On the electrical symbol of a shaded pole motor the shaded coils are not represented.

How would a technician change the rotation of a shaded pole motor?

• Disassemble the motor and turn the stator over.

• Disassemble the motor and turn the rotor over.

• Disassemble the motor and either turn the rotor or stator over.

The centrifugal switch on a split phase motor opens, disconnecting the ____ winding once the motor reaches approximately ____ of it's rated speed.

• start, 75%

• run, 75%

• start, 65%

• run , 65%

Answer explanation

The start winding is a longer wire and smaller diameter than the run winding, thus having a higher resistance. If the start winding is not taken out of the circuit the motor will have a high amp draw and the thermal overload will open.

On a split phase motor, the ____ has more turns than the ____ and is wound with a ____ diameter wire, and the opposite poles of the ____ are wound in different directions.

• run winding, start winding, bigger, run winding

• run winding, start winding, smaller, start winding

• start winding, run winding, smaller, start winding

• start winding, run winding, bigger, run winding

Answer explanation

The start winding creates a larger magnetic field and a greater resistance due to the smaller and longer wound wire, which helps the rotor to start turning and the opposite polarities are set up for the attraction and repulsion forces that starts the rotation.

A Permanent Split Capacitor (PSC) Motor utilizes ____ that is always i the circuit when the motor is energized.

• start capacitor

• run capacitor

• flux capacitor

• a start and run capacitor

Answer explanation

A PSC Motor utilizes a run capacitor which is always in the circuit along with the start and run winding.

A Permanent Split Capacitor (PSC) Motor utilizes a start switch to take out the start winding once the motor achieves about 75% of its rated speed.

• True

• False

Answer explanation

A PSC Motor utilizes a run capacitor which is always in the circuit along with the start and run winding, there is no start switch.

Shaded Pole Motors are used for light duty applications, such as small evaporator and condenser fan motors.

• True

• False

On a multi-speed Permanent Split Capacitor (PSC) Motor as the resistance of the motor winding _____ the motor speed ______.

****Select the correct answers****

• increases, increases

• decreases,

  decreases

• increases,

  decreases

• decreases,

  increases

Answer explanation

On a multispeed PSC motor as the resistance of the the run winding decreases the speed of the motor increases ( a shorter path for the electrons to flow), as the resistance of the run winding increases the speed of the motor decreases (a longer path for the electrons to flow). The relationship between resistance and speed is an inverse one, as one goes up the other one goes down.

Permanent Split Capacitor (PSC) Motors are used in _____.

• low starting torque applications

• high starting torque applications

Answer explanation

PSC Motors are used in low starting torque applications such as blower motor applications (to move air) where the initial load on the motor is the fan on the shaft upon start up. Small heating and cooling system applications.