Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

 7.25 pu
 4.28 pu
 3.75 pu
 2.5 pu

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Power Systems
Per unit of any quantity is defined as

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

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Power Systems
Half life is defined as

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

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