For cost and safety, the outdoor substations are installed for voltages above_________________?

Related Mcqs:

1. Fault diverters are basically____________?

   A. fuses
   B. relays
   C. fast switches
   D. circuit breakers

2. Circuit breakers usually operate under______________?

   A. transient state of short-circuit current
   B. sub-transient state of short-circuit current
   C. steady state of short-circuit current
   D. after D.C. component has ceased

3. When a transmission line is energized, the wave that propagates on it is____________?

   A. current wave only
   B. voltage wave only
   C. Both (A) and (B)
   D. power factor wave only

4. 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

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

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

6. 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

7. Series reactors should have________________?

   A. low resistance
   B. high resistance
   C. low impedance
   D. high impedance

8. A short-circuit is identified by_____________?

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

9. The steady state stability of the power system can be increased by_____________?

   A. connecting lines in parallel
   B. connecting lines in series
   E. using machines of high impedance
   D. reducing the excitation of machines
   E. none 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