Power System - II (3150911) MCQs

MCQs of Corona

Showing 31 to 40 out of 47 Questions
1 2 3 4 5
31.
The effect of corona is
(a) Increased loss
(b) Increased reactance
(c) Increased inductance
(d) All of above
Answer:

Option (a)

32.
Charging current in transmission line increases due to corona effect because corona increases
(a) Line current
(b) Line voltage
(c) Power loss in line
(d) Conductor diameter
Answer:

Option (d)

33.
Chances of occurrence of corona are maximum during
(a) Humid weather
(b) Dry weather
(c) Winter
(d) Summer
Answer:

Option (a)

34.
Corona is likely to occur maximum in case of
(a) Distribution lines
(b) Transmission lines
(c) Domestic wiring
(d) Service  mains
Answer:

Option (b)

35.
Corona is affected by
(a) Size of conductor
(b) Shape and surface condition of the conductor
(c) Operating voltage
(d) All of above
Answer:

Option (d)

36.
The only advantage of corona is that it
(a) Producers a pleasing luminous glow
(b) Makes line current sinusoidal
(c) Works as safety value for surface
(d) Ozone gas is produced
Answer:

Option (c)

37.
Presence of ozone owning to corona
(a) Improves the power factor
(b) Reduces the power factor
(c) Corrodes the material
(d) Improves regulation
Answer:

Option (c)

38.
Corona has the disadvantage of
(a) Power loss
(b) Interference with communication lines
(c) Introducing the harmonics
(d) All of above
Answer:

Option (d)

39.
Dielectric strength of air under normal condition is
(a) 30 kV/cm
(b) 100 kV/cm
(c) 150 kV/cm
(d) 200 kV/cm
Answer:

Option (a)

40.
Dielectric strength of air is
(a) Proportional to barometric pressure
(b) Proportional to absolute temperature
(c) Inversely proportional to barometric pressure
(d) None of above
Answer:

Option (a)

Showing 31 to 40 out of 47 Questions
1 2 3 4 5