1
GATE EE 2017 Set 1
+1
-0.3
A $$3$$-bus power system is shown in the figure below, where the diagonal elements of $$Y$$-bus matrix are: $${Y_{11}} = - j12\,pu,\,\,\,{Y_{22}} = - j15\,pu\,\,$$ and $$\,{Y_{33}} = - j7\,pu.$$

The per unit values of the line reactance's $$p, q$$ and $$r$$ shown in the figure are

A
$$p = - 0.2,\,\,q = - 0.1,\,\,r = - 0.5$$
B
$$p = 0.2,\,\,q = 0.1,\,\,r = 0.5$$
C
$$p = - 5,\,\,q = - 10,\,\,r = - 2$$
D
$$p = 5,\,\,q = 10,\,\,r = 2$$
2
GATE EE 2017 Set 1
Numerical
+1
-0
A 10-bus power system consists of four generator buses indexed as G1, G2, G3, G4 and six load buses indexed as L1, L2, L3, L4, L5, L6. The generator bus G1 is considered as slack bus, and the load buses L3 and L4 are voltage controlled buses. The generator at bus G2 cannot supply the required reactive power demand, and hence it is operating at its maximum reactive power limit. The number of non-linear equations required for solving the load flow problem using Newton-Raphson method in polar form is ____________.
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 __________.
4
GATE EE 2016 Set 1
+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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