1.

Name the form of track, the rails are welded together by utilising flash butt welding to form one continuous rail that may be several kilometres long.(a) INR(b) CBR(c) SBBR(d) WSRThis question was addressed to me during an interview.The query is from Dealing with Railways in division P.W.D of Civil Engineering Drawing

Answer»

The correct choice is (b) CBR

Easy explanation: The PREFERRED process of flash butt welding involves an automated track-laying machine RUNNING a strong electric current through the touching ENDS of TWO unjoined rails. The ends become white hot due to electrical resistance and are then pressed together forming a strong weld. Thermite welding is used to REPAIR or splice together existing CWR segments. This is a manual process requiring a reaction crucible and form to contain the molten iron. Thermite-bonded joints are seen as less reliable and more prone to fracture or break.



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