Applications of Circuit Breakers - MCQs with answers

Applications of Circuit Breakers - MCQs with answers

Q1. A thermal protection switch provides protection against what?

a. Overload
b. Temperature.
c. Short circuit.
d. Over voltage

View Answer / Hide Answer

Q2. Which of the following circuit breakers is used for the railway electrification?

a. Air blast circuit breaker
b. SF₆ circuit breaker
c. Bulk oil circuit breaker
d. Minimum oil circuit breaker

View Answer / Hide Answer

Q3. Which circuit breaker is preferred to be installed in extra high voltage ac system?

a. Bulk oil type circuit breaker
b. Air blast circuit breaker
c. SF₆ circuit breaker
d. Vacuum circuit breaker

View Answer / Hide Answer

Q4. Which among these circuit breakers produce the least arc energy?

a. Plain oil
b. Minimum oil
c. Air blast
d. Air break

View Answer / Hide Answer

Q5. The rating of the circuit breaker is usually determined on the basis of ____________ fault.

a. Symmetrical.
b. Line to line
c. Single line to ground
d. Double line to ground

View Answer / Hide Answer

Q6. Which of the following circuit breakers has the lowest operating voltage?

a. SF₆ circuit breaker
b. Air break
c. Air blast
d. Minimum oil circuit breaker

View Answer / Hide Answer

Q7. 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
d. SF₆ circuit breakers

View Answer / Hide Answer

Q8. Circuit breakers usually operate under

a. Steady short circuit current
b. Sub transient state of short circuit current
c. Transient state of short circuit current
d. None of these

View Answer / Hide Answer