Sulfur Hexafluoride (SF₆) Circuit Breaker Objective Type Questions and answers

36.  SF₆ gas has excellent heat transfer properties because of its

   A. Low gaseous viscosity

   B. High dielectric strength

   C. Higher molecular weight

   D. Both A and C

37.  SF₆ gas is transported in

   A. Air cylinders

   B. Gas cylinders

   C. Liquid form in cylinders

   D. Solid form

38.  During arc extension SF₆ gas gets

   A. Decomposed into SF4 and SF2

   B. Decomposed into S and F ions

   C. Reduced to SF2

   D. Oxidised

39.  The single most important property that makes SF₆ a very efficiant medium for circuit breaking is

   A. It is non-toxic and non-inflammable

   B. It has high dielectric constant

   C. It has high break down strength

   D. It is highly electronegative in character

40.  The current chopping tendency is minimised by using SF₆ gas at relatively

   A. Low pressure and high viscosity

   B. Low pressure and low viscosity

   C. High pressure and low viscosity

   D. High pressure and high viscosity

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