The correct answer is: A. Universal motor
A universal motor is a type of electric motor that can run on either AC or DC power. It is a single-phase motor that uses a squirrel-cage rotor. Universal motors are typically used in applications where high speed and high starting torque are required, such as vacuum cleaners, drills, and saws.
A shaded pole type motor is a type of single-phase induction motor that uses a shaded pole to create a rotating magnetic field. Shaded pole motors are typically used in low-power applications, such as fans and small appliances.
A capacitor start motor is a type of single-phase induction motor that uses a capacitor to create a rotating magnetic field. Capacitor start motors are typically used in applications where high starting torque is required, such as refrigerators and air conditioners.
A capacitor start and run motor is a type of single-phase induction motor that uses a capacitor to create a rotating magnetic field both during starting and running. Capacitor start and run motors are typically used in applications where high starting torque and high running efficiency are required, such as compressors and pumps.
In conclusion, a universal motor is the best choice for an application that needs high speed and high starting torque.