1
GATE EE 2011
+2
-0.6
A lossy capacitor $${C_x}$$, rated for operation at $$5$$ $$kV,$$ $$50$$ $$Hz$$ is represented by an equivalent circuit with an ideal capacitor $${C_p}$$ in parallel with a resistor $${R_p}$$. The value $${C_p}$$ is found to be $$0.102$$ $$\mu F$$ and the value of $${R_p}$$ $$=$$ $$1.25$$ $$M\Omega .$$ Then the power loss and $$tan\delta$$ of the lossy capacitor operating at the rated voltage, respectively, are
A
$$10$$ $$W$$ and $$0.0002$$
B
$$10$$ $$W$$ and $$0.0025$$
C
$$20$$ $$W$$ and $$0.025$$
D
$$20$$ $$W$$ and $$0.04$$
2
GATE EE 2010
+2
-0.6
Consider a three-core, three phase, $$50$$ $$Hz$$, $$11$$ $$kV$$ cable whose conductors are denoted as $$R, Y$$ and $$B$$ in the figure. The inter-phase capacitance $$\left( {{C_1}} \right)$$ between each pair of conductors is $$0.2$$ $$\mu F$$ and the capacitance between each line conductor and the sheath is $$0.4$$ $$\mu F$$ . The per-phase charging current is A
$$2.0$$ $$A$$
B
$$2.4$$ $$A$$
C
$$2.7$$ $$A$$
D
$$3.5$$ $$A$$
3
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.
4
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
$${e_1} = 5.5\,kV,\,{e_2} = 5.5\,kV$$
GATE EE Subjects
Electric Circuits
Electromagnetic Fields
Signals and Systems
Electrical Machines
Engineering Mathematics
General Aptitude
Power System Analysis
Electrical and Electronics Measurement
Analog Electronics
Control Systems
Power Electronics
Digital Electronics
EXAM MAP
Joint Entrance Examination