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Power Systems

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

 0.5
 0.25
 0.75
 0.4

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Power Systems
For transmission line which one of the following relation is true?

 AD - BC = 0
 AD - BC = -1
 AD - BC = 1
 AD + BC = 0

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Power Systems
The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

 Zs = 0.2 pu, Zm =0.7 pu
 Zs = 0.6 pu, Zm =0.5 pu
 Zs = 0.5 pu, Zm =0.6 pu
 Zs = 0.7 pu, Zm =0.2 pu

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Power Systems
A diesel power station has fuel consumption of 0.28 Kg per kWh. The calorific value of fuel is being 10000 KCal / kg. Determine the overall efficiency

  30.7 %.
 40 %.
  30.26 %.
 40.85 %.

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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

 900
 250
 500
 450

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Power Systems
The Y bus matrix of a 100 bus interconnected system is 90% sparse. Then find the number of non zero elements in the Y bus matrix?

 10
 90
 1000
 9000

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