An efficient and a well designed protective relaying should have_____________?

Related Mcqs:

1. The material used for fuse must have_____________?

   A. low melting point and high specific resistance
   B. low melting point and -low specific resistance
   C. high melting point and low specific resistance
   D. low melting point and any specific resistance

2. 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

3. 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

4. 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

5. Air blast circuit breakers for 400 kV power system are designed to operate in_______________?

   A. 100 microsecond
   B. 50 millisecond
   C. 0.5 sec
   D. 0.1 sec

6. The reflection co-efficient at the open circuited end of a transmission line___________?

   A. zero
   B. infinity
   C. unity
   D. none of the above

7. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?

   A. Zero
   B. Unity
   C. Infinity
   D. None of the above

8. Large internal faults are protected by_______________?

   A. merz price percentage differential protection
   B. mho and ohm relays
   C. horn gaps and temperature relays
   D. earth fault and positive sequence relays

9. A.C. network analyser is used to solve problems of_______________?

   A. load flow
   B. load flow and short-circuit
   C. load flow and stability
   D. load flow, short-circuit and stability
   E. none of the above

10. The torque produced in induction type relay (shaded pole structure) is_____________?

    A. inversely proportional to the current
    B. inversely proportional to the square of the current
    C. proportional to the current
    D. proportional to square of the current