Applications of Circuit Breakers - MCQs with answersQ1. A thermal protection switch provides protection against what?
c. Short circuit.
d. Over voltageView Answer / Hide AnswerQ2. Which of the following circuit breakers is used for the railway electrification?
a. Air blast circuit breaker
c. Bulk oil circuit breaker
d. Minimum oil circuit breakerView Answer / Hide Answer
Q3. Which circuit breaker is preferred to be installed in extra high voltage ac system?
ANSWER: a. Air blast circuit breaker
a. Bulk oil type circuit breaker
b. Air blast circuit breaker
d. Vacuum circuit breakerView Answer / Hide Answer
Q4. Which among these circuit breakers produce the least arc energy?
ANSWER: c. SF6 circuit breaker
a. Plain oil
b. Minimum oil
c. Air blast
d. Air breakView Answer / Hide AnswerQ5. The rating of the circuit breaker is usually determined on the basis of ____________ fault.
b. Line to line
c. Single line to ground
d. Double line to groundView Answer / Hide AnswerQ6. Which of the following circuit breakers has the lowest operating voltage?
b. Air break
c. Air blast
d. Minimum oil circuit breakerView Answer / Hide AnswerQ7. Which of the following circuit breakers is highly reliable and has a least maintenance?
a. Oil circuit breakers
b. Air blast
c. Vacuum circuit breakers
circuit breakersView Answer / Hide Answer
Q8. Circuit breakers usually operate under
ANSWER: d. SF6 circuit breakers
a. Steady short circuit current
b. Sub transient state of short circuit current
c. Transient state of short circuit current
d. None of theseView Answer / Hide Answer
ANSWER: b. Sub transient state of short circuit current