a) Proportional to square of current b) Proportional to the current c) Inversely proportional to the square of the current d) Inversely proportional to the current Ans: (c)
a) true b) false Ans: (a)
a) Lower than that of if fault occurs away from the relay b) Higher than that of if the fault occurs away from the relay c) Constant for all distances d) None of the above Ans: (a)
a) The directional relay b) The none directional relay c) The impedance relay d) None of the above Ans: (a)
a) true b) false Ans: (a)
a) true b) false Ans: (a)
a) 4 henrys b) 4.3 henrys c) 5 henrys d) 2 henrys Ans: (b)
a) To avoid the harmonics in the transformers b) To provide artificial neutral earthing where the neutral points of the three phase system are not accessible c) To improve the current capacity of the neutral wire d) None of the above Ans: (b)
a) Overheating of generator only b) Overheating of generator and neutral resistors of earthing transformer c) Overheating of earthing transformer only d) None of the above Ans: (b)
a) 15 mA b) 25 mA c) 5 mA d) 9 mA Ans: (d)