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CHAPTER 5 POWER SYSTEMS YEAR 2012 MCQ 5.1 The bus admittance matrix of a three-bus three-line system is R 13 10 5V W S Y = j S 10 18 10W S 5 10 13W W S T between theX two buses is represented by an If each transmission line equivalent -network, the magnitude of the shunt susceptance of the line connecting bus 1 and 2 is (A) 4 (B) 2 (C) 1 MCQ 5.2 (D) 0 A two-phase load draws the following phase currents : i1 (t) = Im sin ( t 1), i2 (t) = Im cos ( t 2). These currents are balanced if 1 is equal to. (A) 2 (B) 2 (C) ( /2 2) MCQ 5.3 ONE MARK (D) ( /2 + 2) The figure shows a two-generator system applying a load of PD = 40 MW , connected at bus 2. The fuel cost of generators G1 and G2 are : C1 (PG1) = 10000 Rs/MWh and C2 (PG2) = 12500 Rs/MWh and the loss in the 2 line is Ploss (pu) = 0.5PG1 (pu), where the loss coefficient is specified in pu on a 100 MVA base. The most economic power generation schedule in MW is (B) PG1 = 22, PG2 = 20 (A) PG1 = 20, PG2 = 22 (C) PG1 = 20, PG2 = 20 MCQ 5.4 (D) PG1 = 0, PG2 = 40 The sequence components of the fault current are as follows : I positive = j 1.5 pu, I negative = j 0.5 pu, I zero = j1 pu . The type of fault in the system is GATE Previous Year Solved Paper By RK Kanodia & Ashish Murolia Published by: NODIA and COMPANY Visit us at: www.nodia.co.in ISBN: 9788192276243

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