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Power Systems

Power Systems
For n bus power system size of Y bus matrix is

 n×n
 (n-1)×(n-2)
 (n-1)×(n-1)
 (n-2)×(n-2)

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Power Systems
If the inertia constant H = 8 MJ/MVA for a 50 MVA generator, the stored energy is

 200 MJ
 50 MJ
 8 MJ
 400 MJ

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Power Systems
Condition for zero voltage regulation is

 tanφ = X/R
 tanφ = R/X
 cosφ = R/X
 cosφ = X/R

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Power Systems
The flow duration curve at a given head of a hydroelectric plant is used to determine

  total power available at the site.
 diversity factor for the plant.
 total units of energy available.
 load factory at the plant.

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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

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

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Power Systems
Generation of of one watt needs about ______________ fission per second

 3.1 × 106.
 3.1.
 3.1 × 107.
  3.1 × 1010.

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