Power Systems
Plug setting of a relay can be altered by varying

 none of these.
 no. of ampere-turns.
 air gap of magnetic path.
 adjustable back up stop.

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Power Systems
An impulse turbine

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

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