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Power Systems

Power Systems
The angular moment of 10 MVA generator is 0.2. Find the new value of angular moment for 20 MVA base?

 0.2 pu
 0.4 pu
 0.25 pu
 0.1 pu

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Power Systems
Earth fault relay uses the which of the following sequence currents?

 positive sequence
 zero sequence
 any of the above
 negative sequence

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the incident current?

 100 A
 200 A
 2500 A
 250 A

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Power Systems
Main bus bar protection scheme is /are

  differential protection.
  none of these.
  both fault bus and differential protection.
  fault bus protection.

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Power Systems
In a three-phase system, when the loads are perfectly balanced, the neutral current is

  one - third of maximum.
  two - thirds of maximum.
  one - third of minimum.
  zero.

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Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Hydrogen.
  Water.
  Air.
  Liquid.

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