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Power Systems

Power Systems
A gas turbine power plant is best suited for

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

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Power Systems
A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

 12.
  24.
 6.
 16.

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Power Systems
Which of the following statements are true?

 nether 1 nor 2
 Bus impedance matrix is a full matrix
 Bus admittance matrix is a sparse matrix
 both 1 and 2

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Power Systems
Lightning arresters are made up of which material?

 any of the above
 silver
 silicon oxide
 copper

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Power Systems
The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

 225 electrical degrees/s²
 12.5 electrical degrees/s²
 22.5 electrical degrees/s²
 125 electrical degrees/s²

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

  Air.
  Water.
  Hydrogen.
  Liquid.

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