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Power Systems

Power Systems
The Y bus matrix of 100 bus interconnected system is 90% sparse. Hence the number of transmission lines in the system must be

 450
 900
 250
 500

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Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 it is more conductive
 its tensile strength is more
 costlier
 it is cheaper and lighter

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 1 + j 4 A
 1 + j 2 A
 -2 - j 1 A
 5 + j 7 A

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Power Systems
Operator "a" rotates a vector

 nether 1 nor 2
 either 1 or 2
 clock wise direction
 anti clock wise direction

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Power Systems
A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix?

 0.4
 0.25
 0.5
 0.75

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Power Systems
Which of the following is/are the stator faults?

 Inter phase faults
 failure of excitation
 over current
All of these

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