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GATE 2020 || Power Systems || Quiz 5
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Question 1
The parameters of a transposed overhead transmission line are given as:
Self reactance Xs = 0.5 p.u. and Mutual reactance Xm = 0.1 p.u. Calculate positive sequence reactance and zero sequence reactance respectively (in p.u.) are
Question 2
In a nominal T – Model of transmission line Z = 150 Ω and Y = 5× 10-3 Ω (Resistance of the line is negligible). find the value of ‘A’ parameter –
Question 3
A dc distribution system is shown in Figure with load currents as marked. The two ends of the feeder are fed by voltage sources such that VP – VQ = 3V. The value of the voltage VP for a minimum voltage of 220 V at any point along the feeder is
Question 4
The nominal- π circuit of a transmission line is shown in the figure.
Impedance Z=100∠80o-Ω and reactance X=3300-Ω. The magnitude of the characteristic impedance of the transmission line, in Ω, is _______________. (Give the answer up to one decimal place.)
Impedance Z=100∠80o-Ω and reactance X=3300-Ω. The magnitude of the characteristic impedance of the transmission line, in Ω, is _______________. (Give the answer up to one decimal place.)
Question 5
A single phase ring distributor ABC is fed at A. The loads at B and C are 20 A at 0.8 pf lagging and 15 A at 0.6 pf lagging respectively, both expressed with reference to voltage at A. The total impedance of the section AB, BC and CA are (1 + j1), (1 + j2) and (1 + j3) ohm's respectively. The current in section BC, IBC is
Question 6
Consider the model shown in the following figure, of a transmission line with a series capacitor at its mid-point. The maximum voltage on the line is at the location 
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Sep 10ESE & GATE EE
