A differential relay measures the vector difference between_________________?

Related Mcqs:

1. Admittance relay is __________ relay?

   A. impedance
   B. directional
   C. non-directional
   D. none of the above

2. Resistance grounding is used for voltage between_________________?

   A. 33kVto66kV
   B. HkVto33kV
   C. 3.3kVandllkV
   D. none of the above

3. In order that current should flow without causing excessive heating or voltage drop, the relay contacts should_________________?

   A. have low contact resistance
   B. be clean and smooth
   C. be of sufficient size and proper shape
   D. have all above properties

4. The relay operating speed depends upon_________________?

   A. the spring tension
   B. the rate of flux built up
   C. armature core air gap
   D. all of the above

5. Burden of a protective relay is the power______________?

   A. required to operate the circuit breaker
   B. absorbed by the circuit of relay
   C. developed by the relay circuit
   D. none of the above

6. 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

7. Induction cup relay is operated due to changes in________________?

   A. current
   B. voltage
   C. impedance
   D. all of the above

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

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

9. 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

10. If the fault occurs near the impedance relay, the VII ratio will be____________?

    A. constant for all distances
    B. lower than that of if fault occurs away from the relay
    C. higher than that of if fault occurs away from the relay
    D. none of the above