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Power Systems

Power Systems
Find the value of a729, where "a" is the operator

 α
 1
 0
 α²

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Power Systems
The rating of fuse wire is always expressed in

  ampere-volts.
  ampere-hours.
  amperes.
  kWh.

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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?

 LG
 LL
 LLL
 LLG

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Power Systems
A sort line with R/X ratio 1, the zero regulation is obtained when the power factor of the load is

 0 leading
 0.5
 unity
 0.707 leading

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Power Systems
If the load is short circuited, then reflection coefficient of voltage is

 1
 -2
 0
 -1

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Power Systems
The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

 0.0060
 0.60
 0.30
 0.0030

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