Capital Overhauling Of Generator Of U-4(210Mw)At Ntpc-Kahalgaon Stpp,Bihar(Job-A)And Restoration Work Involving Top Bar Replacement Or Plugging Of Stator Bar(S)Of U-4,Turbogenerator,210Mw Set At Kahalgaon Stps,Ntpc,Bihar(Job-B As Reqd Alongwith Job-A