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?