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Free download in PDF High Voltage Engineering Multiple Choice Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
61
Which theory explains the mechanism for breakdown under different conditions?
[A]
Townsend theory
[B]
Streamer theory
[C]
Clump theory
[D]
Only (a) and (b)
62
Inelastic collisions are those in which internal changes in energy take place within an atom or a molecule at the expenses of total kinetic energy of the colliding particle. Suitable example for inelastic collisions is/are
[A]
Ionization
[B]
Attachment
[C]
Excitation
[D]
All of these
63
Druyesteynian distribution applies when the ion energy is much
[A]
Greater than the thermal energy
[B]
Lesser than the thermal energy
[C]
Equal to the thermal energy
[D]
None of these
Answer: Greater than the thermal energy
64
A gas in normal state is almost a perfect
[A]
Conductor
[B]
Insulator
[C]
Semi-conductor
[D]
Dielectric
65
The Townsend mechanism explains the phenomenon of breakdown
[A]
Only at low pressure
[B]
Only at high pressure
[C]
Only at very high pressure
[D]
Only bat very low pressure
Answer: Only at low pressure
66
Liquids dielectrics are mainly used as
[A]
Impregnants in high voltage cables
[B]
In capacitors
[C]
For filling up transformers
[D]
All of these
67
For applications in power cables, the dielectrics most commonly used is
[A]
Polyolefins
[B]
Mineral oil
[C]
Benzene
[D]
Diphenyl
68
High temperature hydrocarbons have
[A]
Higher boiling point and low viscosity
[B]
Lower boiling point and high viscosity
[C]
Lower boiling point and low viscosity
[D]
Higher boiling point and high viscosity
Answer: Higher boiling point and high viscosity
69
Compared to copper and iron losses, dielectric loss in transformer oil is
[A]
Negligible
[B]
Equal
[C]
High
[D]
Very high
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