Breakdown in gas 1

Ionisation is a process where a negative ion, an electron and a positive ion are produced

• Yes

• No

Electron avalanche is developed when the initial set of electrons travels from ____________

• cathode to anode
• anode to cathode

Which of the following processes is not part of primary electron ionisation?

• Photoionisation
• Photoelectric
• Ionisation by collision

When the energy obtained by electron during acceleration between collision exceeds the ionisation potential, what ionisation process will happen?

• Photo-ionization
• Positive ion impact
• Ionisation by collision

The average current in the gap is proportional to the number of electrons reaching the cathode

• Yes

• No

Attachment process will cause the number of free electrons to be reduced and more negative ions are produced

• Yes

• No

When dissociative attachment process happens on SF6 gas, the product will be _____

• SF-
• S- and F
• S and F-
• S- and F-

Streamer theory states that a spark developed from one electron avalanche in the space charge developed by the electron avalanche itself, transforms into a streamer discharge

• Yes

• No

According to streamer theory, from I-V curve, under-exponential current growth is due to _______

• Low space charge concentration
• Low applied voltage
• Low applied electric field

What is the main parameter that controls the occurrence of breakdown in gas?

• Applied current
• Applied electric field
• Applied power