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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

 900
 250
 450
 500

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Power Systems
The arc voltage produced in an AC circuit breaker is always

 in phase opposition with the arc current.
 leading the arc current by 90°.
 lagging the arc current by 90°.
  in phase with the arc current.

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Power Systems
A transmission line has a reactance of 1 Pu is operating at Vs = Vr = 1 Pu. The generator is connected at source end which is delivering 0.5 Pu of active power. Find the load angle?

 30°
 35°
 45°
 60°

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Power Systems
The commercial sources of energy are

 wood, animal wastes and agricultural wastes.
 none of above.
 solar, wind, biomass.
  fossile fuels and radioactive substances.

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Power Systems
The function of reflector is to

 stop the chain reaction.
  bounce back most of the neutrons that escape from the fuel core.
 reduce the speed of the neutrons.
 none of above.

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Power Systems
The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

 j9 pu
 j3 pu
 j1 pu
 j6 pu

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