(A) Closing time
(B) Opening time
(C) Operating time
(D) Circuit breaker time
Answer: (B) Opening time
Explanation:
Opening time of the Circuit Breaker:
The time interval from the energization of the trip coil to the instant of contact separation is called the opening time of the circuit breaker.
Arcing Time:
The time from the separation of contact to the extinction of the arc is called the arcing time.
It depends on the magnitude of fault current as well as the voltage available to maintain the arc and upon the mechanism used for extinguishing the arc.
Total - Break Time:-
The Sum of Opening Time and Arcing Time is called Total Break Time.
1. Under over excitation synchronous phase modifier works as
2. The neutral of the power system may be connected to earth
3. The time to open the circuit breaker contact is called as
4. A 100 Ah capacity battery should deliver a current of 10 A for approximately _____ hrs.
5. For 400KV line, The Spacing Between phase conductor is around
6. Shunt capacitors in a sub-station
7. An alternator is said to be over excited when it is operating at
8. In case of transformer Buchholz relay is used to protect from
9. Series capacitors are used to
10. Disadvantage of low power factor is
11. The colour of neutral three core flexible cable is
12. The location of ground faults in underground cables can be found by
13. Fault location in an HV cable is done by
15. Which of the following is not a valid advantage of bundle conductor?
16. Star-star power transformer is protected by current transformer having
17. The surge resistance of cables is
18. Skin effect is only noticeable at _______ frequencies.
19. When transmission voltage is increased, the line losses are
20. Var compensators are used to
More E-Books
For More Transformer MCQs (Set of 400 Most Asked MCQs)