Power Systems
Alternate formation and breakage of bubbles are called

  cavitations.
All of these
  water hamming.
  surgfication.

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Power Systems
In boiler water reactor (BWR)

  all of above.
 enriched uranium is used as fuel.
 there is danger of radioactive contamination of steam.
 the feed water acts both coolant and a moderator.

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Power Systems
An hydro-graph indicates

 the maximum and minimum run off during the period.
 the discharge at any time during the period under consideration.
All of these
 the average run off during the period.

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