The correct answer is: A. small induction motor.
A pony motor is a small, single-phase induction motor that is used to start larger motors. It is typically connected to the larger motor’s shaft and provides the initial torque required to start the larger motor. Once the larger motor is up to speed, the pony motor is disengaged.
A DC series motor is a type of electric motor that uses a DC power source and has a series winding that is connected in series with the armature winding. This type of motor is characterized by its high starting torque and its ability to operate at high speeds.
A DC shunt motor is a type of electric motor that uses a DC power source and has a shunt winding that is connected in parallel with the armature winding. This type of motor is characterized by its low starting torque and its ability to operate at a constant speed.
A double winding AC/DC motor is a type of electric motor that has two windings, one for AC power and one for DC power. This type of motor can be operated on either AC or DC power, and it is typically used in applications where there is a need for flexibility in the type of power source that can be used.
In conclusion, the correct answer is: A. small induction motor.