8 HCB Flashcards
1
Q
The plasma performs what essential function when breaking a circuit?
A
Flow between two open circuits(contacts)
2
Q
Plasma is defined as the state of matter in which electrons are removed from atoms or molecules, creating an electrically conducting gas. (T or F)
A
True
3
Q
Why must the air in the breaker high air pressure system be very dry?
A
Because its the insulating medium between contacts
4
Q
What is the purpose of SF6 gas in air-blast circuit breakers?
A
To insulate the support column current
5
Q
The purpose if the blast valve is to blow the air from the stationary fingers to the arcing probe. It also cools and lengthens the arc so it will be extinguished at the next current zero. (T or F)
A
True
