Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in different units
 base value of quantity /actual value of quantity in same units
 actual value of quantity /base value of quantity in same units

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Power Systems
A thermal power station needs space

 less than that required by atomic power station of the same output.
  less than that required by hydro-power station of same capacity.
 less than that required by a gas turbine power plant of same output.
 less than that required by the diesel power station of same output.

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