Заполните пропуски глаголами: "to attach", "to serve", "to rotate", "to put

Заполните пропуски глаголами: "to attach", "to serve", "to rotate", "to put into operation":
1. Motors ... to convert different forms of energy into mechanical energy. 2. When the motor is operating its armature ... . 3. Nameplates are ... fo the devices' frames. 4. These two installations should be... simultaneously.