QUESTION FOR CHALLENGERS

                                       QUESTIONS FOR ELECTRICAL ENGINEER
                                                  THI IS FOR CHALLENGERS
                                  
                  1.Can harmonic produce in the dc circuit?

                        2.Which motor is used in electric train and traction?

                         3.What is B.H.P in 3 phase induction motor?

                         4.Why is 3 phase motor neutral not used?