Power Systems
A penstock is used as a condition between

 the heat ex-changer and the turbine in nuclear power plant.
 the turbine and discharge drain.
  the dam and the turbine in a hydro station.
 none of above.

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Power Systems
An impulse turbine

 is most suited for low head and high discharge power plants.
 makes use of a draft tube.
 always operates submerged.
  operates by initial complete conversion to kinetic energy.

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