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Power Systems

Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LLL
 LLG
 LL
 LG

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Power Systems
The average thermal efficiency of a modern nuclear power plant is about

 40 %.
 80 %.
  30 %.
 60 %.

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Power Systems
Operating cost of thermal power station is

 less than that of hydroelectric power plant.
  less than that of diesel power plant.
 is the same as that of nuclear power plant.
 less than that of nuclear power plant.

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Power Systems
The steam power plant efficiency can be improved by

 burning large amount of coal.
 using large quantity of water.
 decreasing the load on the plant.
  using high temperature and high pressure steam.

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Power Systems
When a pumped storage power plant is operated in conjunction with a steam power plant

 chances of the tripping of the system decrease
All of these
 load factor of the steam plant is increased
 the operating cost of the steam plant become optimum

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Power Systems
The pickup value of relay is 6.5 Amp and fault current in relay coil is 39 Amp. Its plug setting multiplier is

  6 A.
 8 A.
 10 A.
 7 A.

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