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Power Systems

Power Systems
Condition for zero voltage regulation is

 tanφ = X/R
 cosφ = X/R
 tanφ = R/X
 cosφ = R/X

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Power Systems
Advantages of pumped storage plants is/are

All of these
 most economical as a peak load supply plant
 operating time is minimum
 used as load frequency control

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Power Systems
What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ?

  100 : 5 / √3.
 150 : 4 / √3.
 120 : 6 / √3.
  200 : 5 / √3.

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Power Systems
India 1st nuclear plant was set up at

  Bhaba.
  Rana pratap sagar.
  Tarapur.
  Kalpakkam.

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Power Systems
A cable has inductance of 0.22 mH per km and capacitance of 0.202 µF per km. The surge impedance of the cable is

 28 Ω
 40 Ω
 33 Ω
 52 Ω

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Power Systems
Surge impedance loading of a 3-phase, 400 kV transmission line is 400 Ω. The surge impedance loading is

 400 MW
 800 MW
 200 MW
 1600 MW

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