GATE EE Power Systems PYQs & Answers — Page 4

Questions 31–40 of 64. Imported answers require independent review unless marked reviewed.

Two single-core power cables have total conductor resistances of 0.7 Ω and 0.5 Ω, respectively, and their insulation resistances (between core and sheath) are 600 MΩ and 900 MΩ, respectively. When the two cables are joined in series, the ratio of insulation resistance to conductor resistance is ________ × 10⁶.

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In the figure shown, self-impedances of the two transmission lines are 1.5j p.u each, and

p.u is the mutual impedance. Bus voltages shown in the figure are in p.u. Given that

, the maximum steady-state real power that can be transferred in p.u from Bus-1 to Bus-2 is

Diagram for Electrical Engineering question 34

Your answerChoose one option.

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A 3-Bus network is shown. Consider generators as ideal voltage sources. If rows 1, 2 and 3 of the

matrix correspond to Bus 1, 2 and 3, respectively, then

of the network is

Diagram for Electrical Engineering question 35

Your answerChoose one option.

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Suppose

and

are a set of unbalanced current phasors in a three-phase system. The phase-B zero-sequence current

p.u. If phase-A current

p.u and phase-C current

p.u, then

in p.u is

Your answerChoose one option.

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A lossless transmission line with 0.2 pu reactance per phase uniformly distributed along the length of the line, connecting a generator bus to a load bus, is protected up to 80 % of its length by a distance relay placed at the generator bus. The generator terminal voltage is 1 pu. There is no generation at the load bus. The threshold pu current for operation of the distance relay for a solid three phase-to-ground fault on the transmission line is closest to:

Your answerChoose one option.

1.00

3.61

5.00

6.25

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Out of the following options, the most relevant information needed to specify the real power (P) at the PV buses in a load flow analysis is

Your answerChoose one option.

solution of economic load dispatch

rated power output of the generator

rated voltage of the generator

base power of the generator

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A single 50 Hz synchronous generator on droop control was delivering 100 MW power to a system. Due to increase in load, generator power had to be increased by 10 MW, as a result of which, system frequency dropped to 49.5 Hz. Further increase in load in the system resulted in a frequency of 49.25 Hz. At this condition, the power in MW supplied by the generator is ________ (rounded off to 2 decimal places).

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Two buses,

and

, are connected with a transmission line of admittance

, at the two ends of which there are ideal transformers with turns ratios as shown. Bus admittance matrix for the system is:

Diagram for Electrical Engineering question 29

Your answerChoose one option.

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Bus 1 with voltage magnitude

pu is sending reactive power

towards bus 2 with voltage magnitude

pu through a lossless transmission line of reactance

. Keeping the voltage at bus 2 fixed at 1 pu, magnitude of voltage at bus 1 is changed, so that the reactive power

sent from bus 1 is increased by 20%. Real power flow through the line under both the conditions is zero. The new value of the voltage magnitude,

, in pu (rounded off to 2 decimal places), at bus 1 is ______.

Diagram for Electrical Engineering question 47

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The

matrix of a two-bus power system having two identical parallel lines connected between them in pu is given as

The magnitude of the series reactance of each line in pu (round off up to one decimal place) is __________.

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GATE EE Power Systems PYQs

Question 15

Question 34

Question 35

Question 36

Question 8

Question 9

Question 23

Question 29

Question 47

Question 21