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 ?

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

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Power Systems
Critical mass is

 none of these.
 a mass of fissionable material required to stop a chain reaction.
  minimum mass of fissionable material required to sustain chain reaction.
 maximum mass of fissionable material required to sustain a chain reaction.

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