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Test: Power Systems- 5 - Question 1

A power system has 200 busses including 15 generator buses. For the load flow analysis using the Newton-Raphson method in polar coordinates, the size of the Jacobian is

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Test: Power Systems- 5 - Question 2

The Z_{bus} of a system is

If a 3 phase fault occurs at BUS – 2, the p.u. fault current in each phase is – (in pu)

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Test: Power Systems- 5 - Question 3

A single line diagram of a power system is shown in the figure. The per unit values of line impedances are given. The sum of diagonal elements of Y_{BUS} matrix is

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Test: Power Systems- 5 - Question 4

The power system network is having a 60 bus system. The YbusYbus of this power system network is having 70% of sparse. The minimum number of transmission lines that exist in the bus system___

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Test: Power Systems- 5 - Question 5

The single line diagram of a power system network having 3 buses and 4 lines is shown in the figure below. The line data is provided in the associated table. The values of the (2, 2) and (2,1) elements of the bus admittance matrix (Y_{BUS}) are

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Test: Power Systems- 5 - Question 6

For a Z bus system Z_{11} = j0.25,Z_{12} = j0.02,Z_{13} = j0.05,z_{14} = j0.04

There are 2 generators at bus 1 and 3 and their sub-transient reactance was induced while calculating Z bus. A three-phase fault occurs at bus 1. The magnitude of pu current supplied by generator 3 whose sub-transient reactance is j0.05 pu is___ (in pu)

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Test: Power Systems- 5 - Question 7

The bus admittance matrix for the network shown in the figure is

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Test: Power Systems- 5 - Question 8

Two generators G_{1} and G_{2} are connected with cable having a reactance of j3 PU and the load demand at two buses are SD_{1} = 20 + j20 PU and SD_{2} = 25 + j2.5 PU the total reactive power in PU at the generating station G_{1} when δ = 20° is ______ PU

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Test: Power Systems- 5 - Question 9

A generator is connected to an infinite bus through a double circuit line as shown

The admittance matrix Y is given by

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Test: Power Systems- 5 - Question 10

The bus impedance matrix of a 4 – bus power system network is given by

An element having an impedance of j 0.12 pu is connected b/n ref bus and bus 2. Calculate new value of Z_{22}.

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