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Power Systems

Power Systems
A gas turbine power plant is best suited for

 Emergency.
 Base load.
 Peak load.
 None of these.

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Power Systems
Which of the following power stations is mainly used to cover peak load on the system?

 gas based thermal power plant
 coal based thermal power plant
 nuclear plant
 pumped storage hydro power plant

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Power Systems
Two identical synchronous machines having same inertia constant are connected in parallel and swinging together. The effective inertia constant is 4 MJ/MVA. Then each machine has inertia constant of

 2 MJ/MVA
 4 MJ/MVA
 8 MJ/MVA
 16 MJ/MVA

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Power Systems
A penstock is used as a condition between

  the dam and the turbine in a hydro station.
 the turbine and discharge drain.
 the heat ex-changer and the turbine in nuclear power plant.
 none of above.

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

  Water.
  Air.
  Hydrogen.
  Liquid.

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Power Systems
A 200 MVA alternator operated at no load at frequency of 50 Hz, it has inertia constant of 5 MWsec/MVA and governing system has a time delay of 0.6 sec. If the load of 50 MW is suddenly applied then find the frequency deviation during this time?

 0.76 Hz
 -0.85 Hz
 -0.76 Hz
 0.85 Hz

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