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Power Systems

Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LLL
 LLG
 LL
 LG

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Power Systems
The function of draft tube is reaction turbine is to

 all of above.
  convert kinetic energy of water.
 reduce water hammer.
 increase flow rate of water.

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Power Systems
Which type of connection is employed for current transformers for the protection of star- delta connected 3-phase transformer?

 star-star
 star-delta
 delta-delta
 delta-star

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Power Systems
The specific speed ( NS ) of turbine is given by

 P√( N ) / H3/2.
 none of these.
  N√( P ) / H1.25.
 N√( P ) / H2/3.

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Power Systems
The equation of area control error(ACE) is

 ACE = ΔPtie +1/ b.Δf
 ACE = ΔPtie + b.Δf
 ACE = ΔPtie - b.Δf
 ACE = ΔPtie - 1/b.Δf

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Power Systems
The fact that current density is higher at the surface when compared to centre is known as

 proximity effect
 skin effect
 carona
All of these

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