Power Systems
Critical mass of the fuel is the amount required to make the multiplication factor

 0.5.
  equal to factor.
 less than 1.
 more than 1.

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Power Systems
The advantage of hydro electric power station over thermal power station is

 hydro electric station can be constructed at the place where the energy is required
 the operation cost of hydro electric power station is low
 hydro electric power station can supply the power throughout the year
 the initial cost of hydro electric power station is low

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