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Power Systems

Power Systems
Example of base load stations are

  both A and B.
  hydro.
  thermal.
  gas turbine.

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Power Systems
Condition for zero voltage regulation is

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

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Power Systems
Find the number of insulator discs required in string insulator, if operating voltage is 220 kV and maximum voltage of each disc is 11 kV?

 13
 21
 20
 10

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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 ?

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

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Power Systems
String chart is drawn between

 both 1 and 2
 T on Y-axis and S and T on on X-axis
 nether 1 nor 2
 temperature (T) on X- axis, sag(S) and tension (T) on Y-axis

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Power Systems
Find the characteristic impedance of a transmission line, if impedance is 16 Ω and admittance is 0.1 mâ„§?

 200 Ω
 320 Ω
 400 Ω
 160 Ω

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