24.a. What type of drive is needed for a vertical lift bridge using two induction motors to operate the two ends of the bridge at the same time? A. Synchrotie drive B. Adjustable voltage drive C....

24.a. What type of drive is needed for a vertical lift bridge using two induction motors to operate the two
ends of the bridge at the same time?
A. Synchrotie drive
B. Adjustable voltage drive
C. Eddy-current coupling
D. Adjustable frequency drive
24.b. To prevent the motor speed from increasing until the motor fails mechanically, a load should always be
connected to a
A. shunt d-c motor.
B. series d-c motor.
C. wound-rotor motor
D. synchronous motor