SF₆ - Sulphur Hexafluoride Circuit Breakers

SF₆ - Sulphur Hexafluoride Circuit Breakers

Q1. Why do the SF₆ gases have an excellent heat transfer property?

a. Low gaseous viscosity.
b. High dielectric strength.
c. Higher molecular weight.
d. Both(a) and (c)

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Q2. What is the major drawback of using SF₆ circuit breakers?

a. Sealing problems of the gas.
b. Ingress of moisture in the gas system – dangerous.
c. Deterioration of SF₆ gas with time.
d. Both (a) and (b)

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Q3. SF₆ is which type of gas?

a. Electro positive
b. Electro negative
c. Both (a) and (b)
d. Just a gas

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Q4. What is the normal pressure at which the SF₆ gas is maintained in the closed position of the breaker?

a. 2 kg / cm²
b. 2.5 kg /cm²
c. 2.8 kg / cm²
d. 3 kg / cm²

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Q5. What is the most important property which makes the SF₆ very efficient medium for circuit breaking?

a. Is non toxic and non inflammable.
b. Has a high dielectric constant.
c. Has a high breakdown strength
d. Is highly electronegative gas

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Q6. During arc extinction SF₆ gas gets converted to which among these?

a. Gets decomposed to SF₄ and SF₂
b. Gets decomposed to S and F
c. Gets reduced to SF₆
d. Gets oxidised

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Q7. SF₆ gas is imported in?

a. Air cylinders
b. Gas cylinders
c. Liquid form in cylinders
d. Solid form.

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