Switch Gear
The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to

insulate the contacts from switch body
All of these
lubricate the contacts
None of these
extinguish the arc

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Switch Gear
The material used for fuse must have

high melting point and low specific resistance
low melting point and any specific resistance
low melting point and high specific resistance
Low melting point and low specific resistance

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