a) (2.9×103 ɭ)/I1.4 b) (2.9×104 ɭ)/I1.4 c) (2.9×104 ɭ)/I2 d) (2.9×104 ɭ)/I Ans: (a)
a) Interception alone b) Interception, conduction and dissipation c) Interception and conduction d) Conduction and dissipation Ans: (b)
a) Differential protection b) Cross-differential protection c) Negative sequence protection d) All of these Ans: (a)
a) 1 to 2 cycles b) 3 to 5 cycles c) 2 to 3 cycles d) 5 to 7 cycles Ans: (a)
a) Its operation does not depend upon the direction of power flow b) Correct relay action can be obtained by using series capacitors on the line c) It can operate even for low value of fault current d) None of these Ans: (c)
a) 10% b) 25% c) 41.6% d) None of above Ans: (c)
a) Earth fault current can be used to operate relays b) “Arcing ground” phenomenon is avoided c) It provides symmetry to the line impedances d) Both (a) and (b)above Ans: (c)
a) Low operating cost b) Free from pollution problems c) No fuel transportation problems d) All of the above. Ans: (d)
a) Transmission lines b) Alternators c) Switch gears d) Transformers Ans: (d)
a) Sodium as moderator and graphite as coolant b) Sodium as coolant and graphite as moderator c) A mixture of sodium and graphite as coolant d) A mixture of sodium and graphite as moderator. Ans: (b)