MCQ 4 HVE

The simplest and the most commonly found dielectrics are

• solid

• gases

• liquid

• none of the above

The transition of non sustaining discharge into self sustaining discharge is called

• ionisation

• collision

• spark breakdown

• vacuum breakdown

The buildup of high currents in a breakdown is due to the process known as

• ionization

• collision

• breakdown

• discharge

A gas in its normal state is almost a perfect

• insulator

• conductor

• semiconductor

• resistor

The process of liberating an electron from a gas molecule with the simultaneous production of a positive ion is called

• ionisation

• collision

• breakdown

• none of the above

The phenomena associated with ionisation by radiation, involves the interaction of radiation with matter is called

• light radiation

• photo ionisation

• photo emission

• photo radiation

The Townsends current growth equation, the average current in the gap, which is equal to the number of electrons travelling per second will be

• I = I₀ X exp (α d)

• I = I₀ exp (α d)

• I = I₀ - (α d)

• none of the above

The development of a spark discharge directly from a single avalanche in which the space charge developed by the avalanche itself is said to be

• Townsends theory

• Streamer theory

• Meek and Loeb theory

• none of the above

V = f(pd) is known as

• Townsend's ionisation equation

• Paschen's law

• Newton's ionisation law

• streamer equation

In a Townsend's discharge the current increases gradually as a function of the

• applied charges

• applied voltage

• applied current

• none of the above