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
Which of the following parameter can be neglected for a short line ?
(A) Inductance
(B) Capacitance
(C) Resistance
(D) Reactance
The under voltage relay can be used for______________?
(A) generators
(B) busbars
(C) transformers
(D) motors
(D) all of the above
For which of the following protection from negative sequence currents is provided ?
(A) Generators
(B) Motors
(C) Transmission line
(D) Transformers
Bus coupler is very essential in arrangement______________?
(A) single bus
(B) double bus, double breaker
(C) main and transfer bus
(D) all of the above
For cost and safety, the outdoor substations are installed for voltages above_________________?
(A) 11 kV
(B) 33 kV
(C) 60kV
(D) 110kV
Short-circuit currents are due to_______________?
(A) single phase to ground faults
(B) phase to phase faults
(C) two phase to ground faults
(D) three phase faults
(D) any of these
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
(D) none of the above
relays are used for phase faults on long line?
(A) Impedance
(B) Reactance
(C) Either of the above
(D) None of the above
relay is preferred for phase fault on short transmission line?
(A) Induction type
(B) Reactance
(C) Impedance
(D) None of the above