Power Systems
Which of following is a medium and low head turbines

  Francis and Kaplan turbines.
  Pelton and Kaplan turbines.
  None of above.
  Kaplan and Francis turbines.

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Power Systems
Half life is defined as

 the time required for full of atoms in a specimen disintegrate.
 the time required to spiliting of a heavy nucleus.
  the time required for one half of isotope to decay.
 none of above.

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