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Power Systems

Power Systems
For load flow studies, What are the quantities specified at load bus are

 V and δ
 δ and Q
 P and Q
 P and V

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Power Systems
Which of the following represents the transmission or reflection coefficient of voltage Tv? (Zl = Surge impedance of load, Zs = Surge impedance of line)

 2Zl/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)
 2Zs/(Zs + Zl)
 (Zs - Zl)/(Zs + Zl)

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Power Systems
The commercial sources of energy are

  fossile fuels and radioactive substances.
 solar, wind, biomass.
 wood, animal wastes and agricultural wastes.
 none of above.

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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

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

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Power Systems
Isolator in sub station is open under ------------- condition?

 short circuit
 any of the above
 no load
 full load

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Power Systems
One atomic mass unit is equivalent to

 251.2 MeV.
 180.5 MeV.
 120.4 MeV.
  931.4 MeV.

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