1
GATE EE 2010
+2
-0.6
A $$50$$ $$Hz$$ synchronous generator is initially connected to a long lossless transmission line which is open circuited at the receiving end. With the field voltage held constant, the generator is disconnected from the transmission line. Which of the following may be said about the steady state terminal voltage and field current of the generator?
A
The magnitude of terminal voltage decreases, and the field current does not change.
B
The magnitude of terminal voltage increases, and the field current does not change.
C
The magnitude of terminal voltage increases, and the field current increases.
D
The magnitude of terminal voltage does not change, and the field current decreases.
2
GATE EE 2010
+2
-0.6
Consider a three-phase, $$50Hz,$$ $$11$$ $$kV$$ distribution system. Each of the conductors is suspended by an insulator string having two identical porcelain insulators. The self capacitance of the insulator is $$5$$ times the shunt capacitance between the link an the ground, as shown in the figure. The voltage across the two insulators are
A
$${e_1} = 3.74\,kV,\,{e_2} = 2.61\,kV$$
B
$${e_1} = 3.46\,kV,\,{e_2} = 2.89\,kV$$
C
$${e_1} = 6.0\,kV,\,{e_2} = 4.23\,kV$$
D
$${e_1} = 5.5\,kV,\,{e_2} = 5.5\,kV$$
3
GATE EE 2010
+2
-0.6
The zero-sequence circuit of the three phase transformer shown in the figure is
A
B
C
D
4
GATE EE 2010
+2
-0.6
A three-phase, $$33$$ kV oil circuit breaker is rated $$1200$$ A, $$2000$$ MVA, $$3$$s. The symmetrical breaking current is
A
$$1200$$ A
B
$$3600$$ A
C
$$35$$ kA
D
$$104.8$$ kA
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