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

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

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Switch Gear
The material used for fuse must have

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

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