a) 20 secs. b) 5 secs. c) 10 secs. d) None of the above Ans: (b)
a) 130° b) 100° c) 25° d) None of the above Ans: (d)
a) Short line fault. b) Medium length line fault. c) Long line fault. d) None of these. Ans: (a)
a) Voltage restrained directional relay. b) Directional restrained over-current relay. c) Voltage restrained over-current relay. d) None of the above. Ans: (b)
a) Neutral of the system only. b) Ground only. c) For zero sequence neutral and for positive and negative the ground. d) None of the above. Ans: (d)
a) Z4>Z2>Z0 b) Z2>Z4>Z0 c) Z0>Z4>Z2 d) None of the above Ans: (a)
a) Sine and cosine comparators respectively b) Cosine and sine comparators respectively. c) Both are cosine comparators. d) Both are sing comparators. Ans: (b)
a) Chemical and ground rods only. b) Chemical and counterpoise only. c) Ground rod and counterpoise only. d) Chemical, ground rods and counterpoise. Ans: (c)
a) Type of circuit breaker. b) Inductance of the system only. c) Capacitance of the system only. d) Inductance and capacitance of the system Ans: (d)
a) 24.25 kV/cm. b) 20.2 kV/cm. c) 23 kV. d) 49.5 kV/cm. Ans: (d)