Power Systems
Which of following power plants is free from environmental problem

 Diesel engine.
  Hydroelectric.
 Steam.
 Nuclear.

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 always
 if the shunt admittances at the buses are ignored
 if the mutual couplings between transmission lines are absent
 if both 2 and 3 are satisfied

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Power Systems
Critical mass is

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

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