Power System - II (3150911) MCQs

MCQs of Corona

Showing 41 to 47 out of 47 Questions
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41.
Visual critical voltage is
(a) Lower than disruptive critical voltage
(b) Higher than disruptive critical voltage
(c) Equal to disruptive critical voltage
(d) None of above
Answer:

Option (b)

42.
Power loss due to corona is directly proportional to
(a) Spacing between conductors
(b) Radius of conductor
(c) Supply frequency
(d) None of above
Answer:

Option (c)

43.
Critical voltage limit of transmission line is increased by
(a) Increasing the radius of conductors
(b) Increasing the spacing between conductors
(c) Reducing the spacing between conductors
(d) Reducing the radius of conductors
Answer:

Option (a)

44.
The maximum permissible value of fair weather corona loss for HV line is
(a) 0.6 kW/phase/km
(b) 1.2 kW/phase/km
(c) 0.3 kW/phase/km
(d) 2.4 kW/phase/km
Answer:

Option (d)

45.
Corona losses are minimized when
(a) Conductor size is reduced
(b) Smooth conductor is used
(c) Sharp points are provided in line hardware
(d) Current density in conductors is reduced
Answer:

Option (b)

46.
Corona loss on a particular system  at 50 Hz is 1 kw/phase/km. Corona loss at 60 Hz will be
(a) 1 kW/phase/km
(b) 0.83 kW/phase/km
(c) 1.2 kW/phase/km
(d) 1.13 kW/phase/km
Answer:

Option (c)

47.
Disruptive corona begins in  smooth cylindrical conductor in air at NTP if the electric field intensity at the conductor surface goes up to
(a) 21.1 kVrms/cm
(b) 21.1 kVpeak/cm
(c) 21.1 kVaverage/cm
(d) 21.1 kVrms/m
Answer:

Option (a)

Showing 41 to 47 out of 47 Questions
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