1
GATE EE 2017 Set 2
MCQ (Single Correct Answer)
+1
-0.3
The figure show the per-phase representation of a phase-shifting transformer connected between buses $$1$$ and $$2,$$ where $$\alpha $$ is a complex number with non-zero real and imaginary parts. GATE EE 2017 Set 2 Power System Analysis - Load Flow Studies Question 19 English
For the given circuit, $${Y_{bus}}$$ and $${Z_{bus}}$$ are bus admittance matrix and bus impedance matrix, respectively, each of size $$2\, \times \,2$$. Which one of the following statements is true?
A
Both $${Y_{bus}}$$ and $${Z_{bus}}$$ are symmetric
B
$${Y_{bus}}$$ is symmetric and $${Z_{bus}}$$ is unsymmetric
C
$${Y_{bus}}$$ is unsymmetric and $${Z_{bus}}$$ is symmetric
D
Both $${Y_{bus}}$$ and $${Z_{bus}}$$ are unsymmetric
2
GATE EE 2017 Set 2
Numerical
+1
-0
In a load flow problem solved by Newton-Raphson method with polar coordinates, the size of the Jacobian is $$\,100\,\, \times \,\,100.$$ If there are $$20$$ PV buses in addition to PQ buses and a slack bus, the total number of buses in the system is ________.
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3
GATE EE 2016 Set 1
Numerical
+1
-0
The magnitude of three-phase fault currents at buses A and B of a power system are 10 pu and 8 pu, respectively. Neglect all resistances in the system and consider the pre-fault system to be unloaded. The pre-fault voltage at all buses in the system is 1.0 pu. The voltage magnitude at bus B during a three-phase fault at bus A is 0.8 pu. The voltage magnitude at bus A during a three-phase fault at bus B in pu, is __________.
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4
GATE EE 2016 Set 1
MCQ (Single Correct Answer)
+1
-0.3
In a 100 bus power system, there are 10 generators. In a particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the PV buses are converted to PQ type. In this iteration.
A
the number of unknown voltage angles increases by two and the number of unknown voltage magnitudes increases by two.
B
the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes increases by two.
C
the number of unknown voltage angles increases by two and the number of unknown voltage magnitudes decreases by two.
D
the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes decreases by two
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