1
GATE EE 2025
Numerical
+1
-0
The bus impedance matrix of a 3-bus system (in pu) is
$$ Z_{\text {bus }}=\left[\begin{array}{lll} j 0.059 & j 0.061 & j 0.038 \\ j 0.061 & j 0.093 & j 0.066 \\ j 0.038 & j 0.066 & j 0.110 \end{array}\right] $$
A symmetrical fault (through a fault impedance of $j 0.007$ p.u.) occurs at bus 2 . Neglecting pre-fault loading conditions, the voltage at bus 1 , during the fault is __________ p.u. (round off to three decimal places).
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2
GATE EE 2022
MCQ (Single Correct Answer)
+1
-0.33
The valid positive, negative and zero sequence impedances (in p.u.), respectively, for a 220 kV, fully transported three-phase transmission line, from the given choices are
3
GATE EE 2018
Numerical
+1
-0
The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV,
star-grounded, 50 Hz generator are ๐0.1 pu, j0.05 pu and j0.01 pu respectively on the
machine rating base. The machine is unloaded and working at the rated terminal voltage. If
the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current
for a b-phase to ground fault (in kA) is __________ (up to 2 decimal places).
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4
GATE EE 2018
Numerical
+1
-0
The series impedance matrix of a short three-phase transmission line in phase coordinates is
$$\left[ {\matrix{
{{Z_s}} & {{Z_m}} & {{Z_m}} \cr
{{Z_m}} & {{Z_s}} & {{Z_m}} \cr
{{Z_m}} & {{Z_m}} & {{Z_s}} \cr
} } \right]$$.
If the positive sequence impedance is (1 + ๐ 10) $$\Omega $$, and the zero sequence is (4 + ๐ 31) $$\Omega $$, then the imaginary part of Zm (in $$\Omega $$) is ______(up to 2 decimal places).
If the positive sequence impedance is (1 + ๐ 10) $$\Omega $$, and the zero sequence is (4 + ๐ 31) $$\Omega $$, then the imaginary part of Zm (in $$\Omega $$) is ______(up to 2 decimal places).
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