a) Above 50 kV b) Equal to and above 5 MVA c) Equal to and above 20 MVA d) Either of the above cases Ans: (b)
a) An under-voltage relay connected across the resistor b) An over-voltage relay connected across the resistor c) An over-current relay connected to the current CT d) Any ground fault relay Ans: (c)
a) True b) False Ans: (a)
a) Steam turbine generators b) Hydro-electric generators c) Gas turbine generators d) All the above e) None of the above Ans: (d)
a) MHO relays b) Reactance relays c) Impedance relays d) Split-phase relays Ans: (a)
a) Reactance relay b) Impedance relay c) MHO relay d) Induction type relay Ans: (a)
a) True b) False Ans: (a)
a) The exciting current by 10% b) The exciting current by 30% c) The exciting current by 50% d) The exciting current by 14.4% e) The primary voltage by 10% Ans: (c)
a) Fail to interrupt heavy short circuit currents b) Are not economically justified c) Are not available d) Require more care and maintenance e) Take more time to clear the fault Ans: (b)
a) True b) False Ans: (a)