Power System lab viva

Front

What does the Y-bus matrix represent in power system analysis?

Back

Admittance matrix

Front

Which of the following statements is true about the Y-bus matrix? It is not always symmetric. It represents the total impedance of the power system. It is computed using Kirchhoff's voltage law (KVL) at each node. It contains both real and imaginary elements

Back

It contains both real and imaginary elements

Front

How is the Y-bus matrix affected when a new branch is added to the power system?

Back

Both diagonal and off-diagonal elements change.

Front

Which method is commonly used for Y-bus formation in power system analysis? Options: Admittance matrix method, Impedance matrix method, Nodal analysis method, Mesh analysis method

Back

Nodal analysis method

Front

What is the size of the Y-bus matrix for an N-bus power system?

Back

N x N

Front

the positive, negative and zero sequence reactance of an element of power system are 0.3, 0.3 and 0.8 respectively. Then the element would be

Back

transmission line

Front

The zero sequence fault currents are absent when the fault is: single line to ground, line to line, double line to ground, None

Back

line to line

Front

When a line-to-ground fault occurs the current in a faulted phase is 100 A. The zero sequence current in this case will be

Back

33.3 A

Front

the value of the expression a + a^2 is

Back

-1

Front

A balanced 3-phase system consists of

Back

positive sequence currents only