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Power Systems

Power Systems
Location of a surge tank, in an hydro electric power station is near

 dam.
 tail race.
  turbine.
 reservoir.

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Power Systems
A gas turbine power plant is best suited for

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

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Power Systems
Example of base load stations are

  hydro.
  gas turbine.
  thermal.
  both A and B.

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Power Systems
A transmission line has a surge impedance of 400 Ω for a length of the line of 200 km. If the length of line is increased to 400 km, then its surge impedance is

 0 Ω
 400 Ω
 800 Ω
 200 Ω

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Power Systems
How to find the total number of strands (N) when number of layers (x) are given

 Total number of strands N = 3x² + 3x - 1
 Total number of strands N = 3x² + 3x + 1
 Total number of strands N = 3x² - 3x + 1
 Total number of strands N = 3x² - 3x - 1

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Power Systems
A fault occurring at the terminals of an unloaded synchronous generator operating at its rated voltage has resulted in the following values of currents and voltages. IR0 = j 2.37 pu IR1 = -j 3.05 pu IR2 = j 0.68 pu VR0 = VR1 = VR2 = 0.237 pu. Which of the following faults has occurred?

 LLG
 LL
 LG
 LLL

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