1
GATE EE 2007
MCQ (Single Correct Answer)
+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 $$B$$? GATE EE 2007 Power System Analysis - Parameters and Performance of Transmission Lines Question 5 English
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
MCQ (Single Correct Answer)
+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 GATE EE 2007 Power System Analysis - Parameters and Performance of Transmission Lines Question 4 English
A
Point $$X$$
B
Point $$Y$$
C
Point $$Z$$
D
Point $$W$$
3
GATE EE 2007
MCQ (Single Correct Answer)
+1
-0.3
The incremental cost curves in Rs/MWhr for two generators supplying a common load of $$700$$ MW are shown in the figures. The maximum and minimum generation limits are also indicated. The optimum generation schedule is: GATE EE 2007 Power System Analysis - Power Generation Cost Question 16 English
A
Generator A : $$400$$ MW,
Generator B : $$300$$ MW
B
Generator A : $$350$$ MW,
Generator B : $$350$$ MW
C
Generator A : $$450$$ MW,
Generator B : $$250$$ MW
D
Generator A : $$425$$ MW,
Generator B : $$275$$ MW
4
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
Consider a synchronous generator connected to an infinite bus by two identical parallel transmission lines. The transient reactance $$x'$$ of the generator $$0.1$$ pu. Due to some previous disturbance, the rotor angle $$(d)$$ is undergoing an undamped oscillation, with the maximum value of $$\delta \left( t \right)$$ equal to $$\,{130^ \circ }\,.$$ One of the parallel lines trip due to relay mal-operation at an instant $$\,\,\,\,\,$$ when $$\,\delta \left( t \right)\,\, = {130^ \circ }\,\,$$ as shown in the figure. The maximum value of the per unit line reactance $$x,$$ such that the system does not lose synchronism subsequent to this tripping is GATE EE 2007 Power System Analysis - Power System Stability Question 18 English
A
0.87
B
0.74
C
0.67
D
0.54
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