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Power Systems

Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Liquid.
  Hydrogen.
  Water.
  Air.

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

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

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 500/5. The plug setting multiplier for a fault current of 5 kA is

 6
 5
 2
 8

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Power Systems
The annual depreciation of hydro power plant is about

  0.5 - 1.5 %.
 10 - 15 %.
 15 - 20 %.
 20 - 25 %.

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Power Systems
Find the relation between sub transient (X"), transient (X') and synchronous reactance (X) ?

 X" < X' > X
 X" > X' < X
 X" < X' < X
 X" > X' >X

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Power Systems
Units of incremental cost is

 Rs/hr
 RsMW/hr
 MWhr/Rs
 Rs/MWhr

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