Maharashtra Seamless Interview Questions, Process, and Tips

Vector group is a code used to represent the phase displacement and connection type of transformer windings.

• Vector group determines the phase shift between the primary and secondary windings of a transformer.

• It also indicates the connection type of the windings, such as Y-Y, Y-Δ, Δ-Y, or Δ-Δ.

• The vector group code consists of a combination of letters and numbers, such as YNd11 or Dyn11.

• The first letter represents the pr...read more

Three phase IM works on the principle of rotating magnetic field produced by three phase AC supply.

• Three phase AC supply is given to the stator winding which produces a rotating magnetic field.

• The rotor winding is short-circuited and the rotating magnetic field induces a current in it.

• The interaction between the stator and rotor magnetic fields produces torque which rotates the rotor.

• The speed of the rotor is slightly ...read more

Starters in 3-ph Im

• Starters are used to control the starting and stopping of 3-phase induction motors.

• Direct-on-line (DOL) starters are the simplest type of starters.

• Soft starters and variable frequency drives (VFDs) are more advanced types of starters.

• Starters protect the motor from overloading and overheating.

• Starters also provide a means of reversing the motor's direction of rotation.