WEEK 32

Ques 1. Thermit is a trade name for a mixture of finely divided-

(a) Sulphur oxide and a metal reducing agent

(b) metal oxide and a metal reducing agent

(c) Nitrate oxide and a metal reducing agent

(d) Non -metal and a metal reducing agent

Ques 2. Thermit for welding electric connections consist of-

(a)   Sulphur oxide

(b)  Nitrate oxide and Aluminium

      (c)Copper Oxide and Aluminium

      (d) Metal oxide

Ques 3. Ignition powder which is used frequently-

(a)   Barium per oxide

(b)  Zinc per oxide

(c)   Sodium per oxide

(d)  Hydrogen per oxide

Ques 4. Rails are welded to create-

(a)  Short railways for electrified and other fast tracks.

(b) long railways for electrified and other fast tracks.

(c) long railways for non -electrified and other fast tracks.

(d) Short railways for non- electrified and other fast tracks.

Ques 5. To minimize the distortion and contraction we can use-

(a)Ceramic backing strips

(b)Mechanical backing strips

(c)Ceramic backing tapes

(d)backing strips and backing bars.

Ques 6.What is Thermit Welding?

Ques 7.Explain Principle of Thermit Welding.

Ques 8.How many types of Thermit Welding is there?

Ques 9. What are the applications of Thermit Welding?

Ques10.Describe the role of  backing strips & backing bars in Thermit welding.