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Power Systems

Power Systems
Fault calculations using computer are usually done by

 either 1 or 2
None of these
 Z bus method
 Y bus method

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Power Systems
A transmission line has (2 + j4)Ω impedance, 100 MVA and base voltage is 10 KV. Find the per unit impedance value of transmission line?

 (2 + j4 ) pu
 (0.5 + j1 ) pu
 (4 + j8 ) pu
 (1 + j2 ) pu

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Power Systems
In thermal power plants the size of coal after crushing

  300 mm.
 40 mm.
  20 - 25 mm.
 200 - 205 mm.

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Power Systems
The ground capacitance existing between transmission line and ground is 4µF. Find the inductive reactance of the peterson coil for compensation of arcing grounds?

 265.25 Ω
 855.26 Ω
 625.35 Ω
 0.844 Ω

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Power Systems
Corona is accompanied by

 power loss and interference
All of these
 violet visible light
 hissing sound

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Power Systems
If the frequency is increased, then skin effect will

 increases
 remains unaffected
 any of the above
 decreases

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