The correct answer is: D. none of the above.
A universal motor is a type of electric motor that can operate on either direct current (DC) or alternating current (AC). It is a series-wound motor, which means that the field winding and the armature winding are connected in series. This type of motor has a high starting torque and can be used in a variety of applications, such as vacuum cleaners, power tools, and food mixers.
The speed/load characteristics of a universal motor are different from those of a DC motor. A DC motor has a constant speed when the load is changed. A universal motor, on the other hand, has a speed that decreases as the load increases. This is because the current through the field winding increases as the load increases, which causes the magnetic field to weaken. This weakening of the magnetic field
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