To reduce short circuit fault currents are used_____________?

Related Mcqs:

1. Short-circuit currents are due to_______________?

   A. single phase to ground faults
   B. phase to phase faults
   C. two phase to ground faults
   D. three phase faults
   E. any of these

2. The information to the circuit breaker under fault conditions is provided by____________?

   A. relay
   B. rewirable fuse
   C. H.R.C. only
   D. all of the above

3. relay is preferred for phase fault on short transmission line?

   A. Induction type
   B. Reactance
   C. Impedance
   D. None of the above

4. Interruption of large currents by relay requires______________?

   A. arc suppressing blow out coils
   B. wide separation of the opened contacts
   C. high speed opening of contacts
   D. all of the above

5. For which of the following protection from negative sequence currents is provided ?

   A. Generators
   B. Motors
   C. Transmission line
   D. Transformers

6. The short circuit in any winding of the transformer is the result of______________?

   A. mechanical vibration
   B. insulation failure
   C. loose connection
   D. impulse voltage

7. The short circuit in any winding of the transformer is the result of_______________?

   A. mechanical vibration
   B. insulation failure
   C. loose connection
   D. impulse voltage

8. A short-circuit is identified by_____________?

   A. no current flow
   B. heavy current flow
   C. voltage drop
   D. voltage rise

9. To limit short-circuit current in a power system are used______________?

   A. earth wires
   B. isolators
   C. H.R.C. fuses
   D. reactors

10. The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?

    A. heavy loads
    B. internal short-circuits
    C. external short-circuits
    D. all of the above