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

Related Mcqs:

1. The single phasing relays are used for the protection of_____________?

   A. single phase motors only B. two phase motors only C. two single phase motors running in parallel D. three phase motors...

2. Thermal overload relays are used to protect the motor against over current due to____________?

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

3. 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...

4. The relay with inverse time characteristic will operate within____________?

   A. 1.5 sec B. 5 to 10 sec C. 5 to 20 sec D. 20 to 30 sec E. none of the above...

5. Overload relays are of_______________type

   A. induction B. solid state C. thermal D. electromagnetic E. all above...

6. D.C. shunt relays are made of_____________?

   A. few turns of thin wire B. few turns of thick wire C. many turns of thin wire D. many turns of thick wire...

7. Directional relays are based on flow of____________?

   A. power B. current C. voltage wave D. all of the above...

8. Protective relays are devices that detect abnormal conditions in electrical circuits by measuring_____________?

   A. current during abnormal condition B. voltage during abnormal condition C. constantly the electrical quantities which differ during normal and abnormal conditions D. none of the above...

9. Relays can be designed to respond to changes in________________?

   A. resistance, reactance or impedance B. voltage and current C. light intensity D. temperature E. all above...

10. relays are used for phase faults on long line?

    A. Impedance B. Reactance C. Either of the above D. None of the above...