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problem 1: prepare down the basic difference between switch and C.B.?

problem 2: Describe the characteristics of fuse?

problem 3: Why does an arc form when the contact of CB separators?

problem 4: Describe different methods of extinguishing the arc.

problem 5: prepare brief notes:

a) Restricting voltage.
b) Recovery voltage.
c) Current chopping.

problem 6: What are the draw backs of O.C.B?

problem 7: Why VCB become popular than O.C.B and what are their advantages.

problem 8: Describe the important properties of SF6.

problem 9: describe in detail the constants features of A.B.C.B?

problem 10: What are the specifications to be given to procure C.B. from the market?

problem 11: What is a universal torque equation of relay and how is O.C. directional and differential relay characteristics obtained?

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