Power Systems - Interview Questions | Exam2Win

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51. Corona losses are minimized when

A. conductors size is reduced

B. smooth conductor is reduced

C. sharp points are provided in the line hardware

D. current density in conductors is reduced

Explanation:

52. The non-uniform distribution of voltage across the units in a string of suspention type insulators is due to

A. unequal self-capacitance of the units

B. non-uniform distance of separation of the units from the tower body

C. the existence of stray capacitance between the metallic junctions of the units and the tower body

D. non-uniform distance between the cross-arm and the units

Explanation:

53. For a long uncompensatedline the limit to the line loading ill governed by

A. thermal limit

B. voltage drop

C. stability limit

D. corona loss

Explanation:

54. The time taken for a surge to travel a 600 km long overhead transmission line is

A. 6s

B. 1s

C. 0.02s

D. 0.002s

Explanation:

55. With 100 % series compensation of line.

A. the circuit is series resonant at power frequency

B. low transient voltage

C. high transient current

D. both (a) and (c)

Explanation: