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Power Systems

Power Systems
Proximity effect is more in case of

 over head lines
 same in both cases
None of these
 power cables

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

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

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Power Systems
The specific speed of water turbine is the speed at which the turbine develops

 unit horse power at all heads.
 maximum horse power.
 a minimum horse power.
  unit horse power at unit head.

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Power Systems
A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum and zero voltage regulation?

 0.8 lag and 0.6 lead
 0.6 lag and 0.8 lead
 0.8 lag and 0.8 lead
 0.6 lag and 0.6 lead

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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?

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

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Power Systems
Which material is used in controlling chain reaction in a nuclear reactor

  Boron.
 Thorium.
 Beryllium.
 Heavy water.

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