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.

1. Motors serve to convert different forms of energy into mechanical energy. 2. When the motor is operating its armature rotates. 3. Nameplates are attached to the device frames. 4. These two installations should be put into operation simultaneously.