Oil Circuit Breaker - MCQs with answers

Oil Circuit Breaker - MCQs with answers

Q1. When does the arc interruption in oil circuit breaker take place?

a. Contacts apart.
b. Voltages becomes zero
c. Current goes through zero
d. All of the above

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Q2. What is the advantage of using oil as the arc quenching medium?

a. Good cooling properties.
b. High dielectric strength.
c. Acts as an insulator.
d. All of these.

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Q3. What is the main purpose of oil in oil circuit breakers?

a. Provide insulation
b. Quenching arc.
c. Provide cooling of contacts.
d. None of the above

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4. What is/are the main disadvantage(s) of using oil as the quenching medium in the circuit breakers?

a. Need periodical replacement.
b. Risk of formation of explosive mixture with air.
c. Possibility of causing fire hazards.
d. All of the above.

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5. A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3s. What is its symmetrical breaking current?

a. 1200 A
b. 3600 A
c. 35 kA
d. 104.8 kA

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