SRM V-Lab: Pre test

POWER SYSTEM SIMULATION LABORATORY

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Pre Test

A network has 7 elements connected across 5 buses. Its primitive admittance matrix has the dimension of

a : 5 x 5 b : 5 x 7 c : 7 x 5 d : 7 x 7

For a three-bus power network, the bus admittance matrix is
Y₁₁ = -j10
Y₁₂ = -j10
Y₁₃ = j2
Y₂₁ = j8
Y₂₂ = j2
Y₂₃ = -j15
Y₃₁ = j12
Y₃₂ = j8
Y₃₃ = -j20
Which one of the following is correct?

a : There is a shunt element at bus 1 alone b : There is a shunt element at bus 2 alone c : There is a shunt element at bus 3 alone d : There are shunt elements at buses 1 and 3

In an off-nominal transformer with off nominal setting a and bus k as the tap side and bus m as the load side, the two diagonal elements in the bus admittance representation are

a : y and (y/a²) corresponding to buses k and m respectively b : (y/a) and – y corresponding to buses k and m respectively c : – y and (y/a) corresponding to buses k and m respectively d : (y/a²) and y corresponding to buses k and m respectively

For n bus power system, the size of Ybus matrix is

a : (n-1)×(n-1) b : (n-2)×(n-2) c : n×n d : (n-1)×(n-2)

Bus admittance matrix of a network without mutual coupling is computed. The orientation of element 3-4 is changed. In the new bus admittance matrix

a : value of element Y₃₃ will change b : value of element Y₄₄ will change c : value of element Y₃₄ will change d : values remain unchanged

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