High Voltage Engineering Multiple Choice Questions with Answers

Questions

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)

Answer: 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

View Answer

Answer: All of these

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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

View Answer

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

View Answer

Answer: Insulator

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

View Answer

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

View Answer

Answer: All of these

67 For applications in power cables, the dielectrics most commonly used is

A Polyolefins

B Mineral oil

C Benzene

D Diphenyl

View Answer

Answer: Polyolefins

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

View Answer

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

View Answer

Answer: Negligible

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