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Power Systems

Power Systems
Most commonly used material for insulator is

 porcelain
All of these
 mica
 glass

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Power Systems
Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be

 0.25 pu
 0.05 pu
 0.45 pu
 0.15 pu

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Power Systems
In a thermal power plants, pressure in the working fluid cycle is developed by

 turbine.
  feed water pump.
 condenser.
 superheater.

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Power Systems
The overall efficiency of a steam power plant equal to

 regenerative cycle.
 binary vapor cycle.
  product of boiler efficiency, turbine efficiency and generator efficiency.
 the Rankine cycle.

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Power Systems
Incremental cost of two generators Ic1 = 0.2 P1+60, Ic2 = 0.3 P2+40 and the ratings of the generator are 150 and 250 MW. Find the load sharing of each generator for a load of 200 MW?

 P1 = 80 MW, P2 = 120 MW
 P1 = 120 MW, P2 = 80 MW
 P1 = 60 MW, P2 = 140 MW
 P1 = 100 MW, P2 = 100 MW

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Power Systems
A generated station has a maximum demand of 30 MW, a load factor of 60% and a plant capacity factor of 50%. The reserve capacity of the plant is

 6 MW
 5 MW
 10 MW
 12 MW

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