CL wadhwa bits solutions (29-35)

Lesson 6 of 21 • 50 upvotes • 13:26mins

Anvesh Sameer

29. For rural electrification in a country like India with complex network it is preferable to use: (a) Air break C.B. (b) Oil C.B. (c) Vacuum C.B. (d) M.O. C.B. 30. The current chopping tendency is minimised by using the SF6 gas at relatively: (a) High pressure and low velocity (b) High pressure and high velocity (c) Low pressure and low velocity (d) Low pressure and high velocity. 31. SF6 gas has excellent heat transfer properties because of its: (a) Higher molecular weight (b) Low gaseous viscosity (c) Higher dielectric strength (d) A combination of (a) and (b) (e) A combination of (b) and (c). 32. A fault is more severe from the view point of RRRV if it is a: (a) Short line fault (b) Medium length line fault (c) Long line fault (d) None of the above. 33. The most suitable C.B. for short line fault without switching resistor is: (a) Air blast C.B. (b) M.O.C.B. (c) SF6 Breaker (d) None of the above. 34. The voltages at the two ends of a line are 132 kV and its reactance is 40 ohms. The capacity of the line is: (a) 435.6 MW (b) 217.5 MW (c) 251.5 MW (d) 500 MW. 35. An overhead line with series compensation is protected using: (a) Impedance relay (b) Reactance relay (c) Mho relay (d) None of the above.