Short-circuit currents are due to_______________?

Related Mcqs:

1. To reduce short circuit fault currents are used_____________?

   A. reactors B. resistors C. capacitors D. none of the above...

2. 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...

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

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

4. 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...

5. 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...

6. A short-circuit is identified by_____________?

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

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

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

8. Overheating of relay contacts or contact born out is due to_______________?

   A. slow making and breaking of load circuit contacts B. foreign matter on the contact surface C. too low contact pressure D. all of the above...

9. Circuit breakers are essentially______________?

   A. current carrying contacts called electrodes B. arc extinguishers C. circuits to break the system D. transformers to isolate the two systems E. any of the above...

10. A fuse in a motor circuit provides protection against__________?

    A. overload B. short-circuit and overload C. open circuit, short-circuit and overload D. none of the above...