1
GATE EE 2007
+1
-0.3
Consider the transformer connections in a part of a power system shown in the figure. The nature of transformer connections and phase shifts are indicated for all but one transformer. Which of the following connections, and the corresponding phase shift $$\theta ,$$ should be used for the transformer between $$A$$ and $$B$$?
A
Star $$-$$ $$\,\left( {\theta = {0^ \circ }} \right)$$
B
Star $$-$$ Delta $$\,\left( {\theta = {-30^ \circ }} \right)$$
C
Delta $$-$$ Star $$\,\left( {\theta = {30^ \circ }} \right)$$
D
Star $$-$$ Zigzag $$\,\left( {\theta = {30^ \circ }} \right)$$
2
GATE EE 2007
+1
-0.3
Consider a bundled conductor of an overhead line consisting of three identical sub-conductors placed at the corners of an equilateral triangle as shown in figure. If we neglect the charges on the other phase conductors and ground, and assume that spacing between sub-conductors is much larger than their radius, the maximum electric field intensity is experienced at
A
Point $$X$$
B
Point $$Y$$
C
Point $$Z$$
D
Point $$W$$
3
GATE EE 2006
+1
-0.3
The concept of an electricity short, medium and long line is primarily based on the
A
Nominal voltage of the line
B
Physical length of the line
C
Wavelength of the line
D
Power transmitted over the line
4
GATE EE 2006
+1
-0.3
A $$400$$ V, $$50$$ Hz, three phase balanced source supplies power to a star connected load whose rating is $$12\sqrt 3$$ kVA, $$0.8$$ pf(lag). The rating (in kVAR) of the delta connected (capacitive) reactive power bank neccessary to bring the pf to unity is
A
$$28.78$$
B
$$21.60$$
C
$$16.60$$
D
$$12.47$$
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