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The current chopping tendency is minimised by using the SF6 gas at relatively
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- high pressure and low velocity
- high pressure and high velocity
- low pressure and low velocity
- low pressure and high velocity
Correct Option: C
SF6 has excellent heat transfer properties as it have a high molecular weight and low gaseous viscosity enabling it to transfer heat by connection more effectively than the common gases. Thus arc can be better interrupted by slowing down the electrons by cooling in case of SF6. Also as, thermal line constant of SF6 is low, the pressures at which it should be stored and used are relatively smaller compared to air.
