1
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
For the $${Y_{bus}}$$ matrix of a $$4$$-bus system given in per unit, the buses having shunt elements are
$$${Y_{BUS}} = j\left[ {\matrix{
{ - 5} & 2 & {2.5} & 0 \cr
2 & { - 10} & {2.5} & 4 \cr
{2.5} & {2.5} & { - 9} & 4 \cr
0 & 4 & 4 & { - 8} \cr
} } \right]$$$
2
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
The Gauss Seidel load flow method has following disadvantages. Tick the incorrect student.
3
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
For a power system the admittance and impedance matrices for the fault studies are as follows.
$$$\eqalign{
& {Y_{bus}} = \left[ {\matrix{
{ - j8.75} & {j1.25} & {j2.50} \cr
{j1.25} & { - j6.25} & {j2.50} \cr
{j2.50} & {j2.50} & { - j5.00} \cr
} } \right] \cr
& {Z_{bus}} = \left[ {\matrix{
{j0.16} & {j0.08} & {j0.12} \cr
{j0.08} & {j0.24} & {j0.16} \cr
{j0.12} & {j0.16} & {j0.34} \cr
} } \right] \cr} $$$
The pre-fault voltages are $$1.0$$ $$p.u.$$ at all the buses. The system was unloaded prior to the fault. A solid $$3$$ phase fault takes place at bus $$2.$$
The per unit fault feeds from generators connected to buses $$1$$ and $$2$$ respectively are
4
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
For a power system the admittance and impedance matrices for the fault studies are as follows.
$$$\eqalign{
& {Y_{bus}} = \left[ {\matrix{
{ - j8.75} & {j1.25} & {j2.50} \cr
{j1.25} & { - j6.25} & {j2.50} \cr
{j2.50} & {j2.50} & { - j5.00} \cr
} } \right] \cr
& {Z_{bus}} = \left[ {\matrix{
{j0.16} & {j0.08} & {j0.12} \cr
{j0.08} & {j0.24} & {j0.16} \cr
{j0.12} & {j0.16} & {j0.34} \cr
} } \right] \cr} $$$
The pre-fault voltages are $$1.0$$ $$p.u.$$ at all the buses. The system was unloaded prior to the fault. A solid $$3$$ phase fault takes place at bus $$2.$$
The post fault voltages at buses $$1$$ and $$3$$ in per unit respectively are
Questions Asked from Load Flow Studies (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE EE Subjects
Electric Circuits
Electromagnetic Fields
Signals and Systems
Electrical Machines
Engineering Mathematics
General Aptitude
Power System Analysis
Electrical and Electronics Measurement
Analog Electronics
Control Systems
Power Electronics