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Electrical Engineering Objective Questions { Power System }

176. For a 400kV transmission line, the switching over voltage crest in kV is
B. 400 5
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177. For a 400 kV transmission line, the number of standard disc used in practice are
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178. Compared to the insulation level of the station equipment, the line insulation is
A. the same
B. greater
C. less
D. not directly related
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179. The sag of a transmission line is affected by
A. its own weight and weight of the ice formed
B. temperature and wind condition
C. both (a) and (b) above
D. none of these
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180. In a transmission line, the shunt conductance results due to
A. axial current in the conductor
B. radial current in the conductor
C. leakage over the insulator
D. short circuiting of line by the load
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181. A three-phase line is spaced at the corner of an equilateral triangle having each side at D and each conductor has GMR of r. The inductance of each conductor in henrys per metre is3D
A. 2 x 10-7 In
B. 2 x 10-7 In ?r?3r
C. 4 x 10-7 In D/r
D. 2 x 10-7 In D/r
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182. Are voltage produced in ac circuit breaker is always
A. in phase opposition to the arc current
B. in phase with the arc current
C. leading the arc current by 900
D. lagging the arc current by 45?
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