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Power Systems

Power Systems
In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines?

 2
 5
 8
 4

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Power Systems
The area under a flow duration curve represents

 total power available.
  total quantity of run-off during that period.
 total of units of energy available.
 maximum rate of run-off during the period.

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

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Power Systems
The capacitance of an overhead transmission line increases with

 increase in height of conductors above ground
 neither 1 nor 2
 both 1 and 2
 increase in mutual geometrical mean distance

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the transmitted voltage?

 30.6 Kv
 100 kV
 18.18 kV
 36. 36 kV

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Power Systems
Transmission line has a length of 300 km, operating at sending end voltage Vs = 1 pu, find the receiving end voltage(Vr) at no load?

 1.098 pu
 1 pu
 0.98 pu
 0.098 pu

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