Protection by fuses is generally not used beyond__________?

Related Mcqs:

1. The delay fuses are used for the protection of ___________?

   A. motors B. power outlet circuits C. fluorescent lamps D. light circuits...

2. H.R.C. fuses provide best protection against________________?

   A. overload B. reverse current C. open-circuits D. short-circuits...

3. A thermal protection switch can protect against_____________?

   A. short-circuit B. temperature C. overload D. over voltage...

4. For the protection of power station buildings against direct strokes the requirements are___________?

   A. interception B. interception and conduction C. interception, conduction and dissipation D. interception, conduction, dissipation and reflection E. none of the above...

5. Which of the following is the least expensive protection for overcurrent is low voltage system ?

   A. Rewireable fuse B. Isolator C. Oil circuit breaker D. Air break circuit breaker E. None of the above...

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

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

7. 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...

8. Over voltage protection is recommended for______________?

   A. hydro-electric generators B. steam turbine generators C. gas turbine generators D. all of the above E. none of the above...

9. Overfluxing protection is recommended for_____________?

   A. distribution transformer B. generator transformer of the power plant C. auto-transformer of the power plant D. station transformer of the power plant...

10. For which of the following ratings of the transformer differential protection is recommended ?

    A. above 30 kVA. B. equal to and above 5 MVA C. equal to and above 25 MVA D. none of the above...