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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

 500
 450
 900
 250

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Power Systems
For 132 kV system, the reactance and capacitance up to the location of the CB is 3 Ω and 0.015 μF respectively. The maximum value of RRRV is

 12.2 kV / μs.
  9.01 kV / μs.
 2.0 kV / μs.
 10.01 kV / μs.

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Power Systems
A load centre is at an equidistant from the two thermal generating stations G1 and G2. The fuel cost characteristics of the generating stations are given by F1 = a + bP1 + cP²1 F2 = a + b P2 + 2cP²2 Where P1 and P2 are the generation in MW of G1 and G2, respectively. For most economic generation to meet 300 MW of load, P1 and P2 respectively, are

 150, 150
 200, 100
 100, 200
 175, 125

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Power Systems
Stock bridge dampers are used in case hill areas to over come the which problem?

All of these
 increase string efficiency
 unequal ice loading
 increase power factor

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Power Systems
The positive (Z1), negative (Z2) and zero sequence (Z0) impedances of a transmission line follows the relation

 (Z1 = Z2) < Z0
 (Z1 = Z2) > Z0
 any of the above
 Z1 = Z2 = Z0

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Power Systems
Frequencies must be same in which of the following line to exchange the power from one place to other place ?

 Synchronous line
 both 1 and 2
 Asynchronous line
 No need of same frequency for exchange of power

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