1
GATE EE 2005
MCQ (Single Correct Answer)
+2
-0.6
The parameters of transposed overhead transmission line are given as: self reactance $${X_s} = 0.4\,\,\Omega /km$$ and Mutual reactance $$\,{X_m} = 0.1\,\,\Omega /km.\,\,$$ The positive sequence reactance $${X_1}$$ and zero sequence reactance $${X_0}$$ respectively in $$\Omega /km$$ are
A
$$0.3, 0.2$$
B
$$0.5, 0.2$$
C
$$0.5, 0.6$$
D
$$0.3, 0.6$$
2
GATE EE 2005
MCQ (Single Correct Answer)
+2
-0.6
At a $$220$$ kV substation of a power system, it is given that the three-phase fault level is $$4000$$ MVA and single-line to ground fault level is $$5000$$ MVA. Neglecting the resistance and the shunt susceptances of the system.

The positive sequence driving point reactance at the bus is

A
$$2.5\,\Omega $$
B
$$4.033\,\Omega $$
C
$$5.5\,\Omega $$
D
$$12.1\,\Omega $$
3
GATE EE 2005
MCQ (Single Correct Answer)
+2
-0.6
At a $$220$$ kV substation of a power system, it is given that the three-phase fault level is $$4000$$ MVA and single-line to ground fault level is $$5000$$ MVA. Neglecting the resistance and the shunt susceptances of the system.

The zero sequence driving point reactance at the bus is

A
$$2.2\,\Omega $$
B
$$4.84\,\Omega $$
C
$$18.18\,\Omega $$
D
$$22.72\,\Omega $$
4
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A $$3$$-phase generator rated at $$110$$ MVA, $$11$$ kV is connected through circuit breakers to a transformer. The generator is having direct axis sub-transient reactance $$X'{'_d} = 19\% ,\,\,$$ transient reactance $$X{'_d} = 26\% \,\,$$ and synchronous reactance $$=130$$%. The generator is operating at no load and rated voltage when a three phase short circuit fault occurs between the breakers and the transformer. The magnitude of initial symmetrical rims current in the breakers will be
A
$$4.44$$ kA
B
$$22.20$$ kA
C
$$30.39$$ kA
D
$$38.45$$ kA
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