The contactor coil is connected to which line of a three-phase contactor?

The Relay Shown below is a relay with two sets of switching contacts. The abbreviation N.C. stands for normally closed and means that the contacts are in a closed position as long as the coil is de-energized. Similarly, N.O. means normally open and the contact remains open as long as there is no current flowing through the coil. Finish the drawing by connecting all parts in such a manner that lamp A is burning all the time but turns off when the push button is depressed. Lamp B will turn on at the same time lamp A is extinguished. neti tion N.C. Obje N.O. A Indu B0

Q3. Explain the advantage and disadvantage of open-loop and closed-loop systems in control system.