Vacuum Circuit Breakers - MCQs with answers

Vacuum Circuit Breakers - MCQs with answers

Q1. To limit current chopping in vacuum circuit breakers, the contact material employed should have the properties of

a. Low conductivity and high vapour pressure.
b. Low conductivity and low vapour pressure.
c. High conductivity and high vapour pressure.
d. High conductivity and low vapour pressure.

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Q2. Keeping in view the cost and the overall effectiveness, which of the following circuit breaker is best suited for capacitor bank switching?

a. Vacuum circuit breaker
b. Air blast CB
c. SF₆
d. Oil CB

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Q3. For rural electrification in India, which circuit breaker is generally used?

a. Oil
b. SF₆
c. Vacuum
d. Air blast

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