Power Systems
Find the relation between sub transient (X"), transient (X') and synchronous reactance (X) ?

 X" > X' >X
 X" > X' < X
 X" < X' > X
 X" < X' < X

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Power Systems
Per unit of any quantity is defined as

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

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Power Systems
Half life is defined as

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

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