Power Systems
Which of the following statements are true?

 both 1 and 2
 nether 1 nor 2
 Bus impedance matrix is a full matrix
 Bus admittance matrix is a sparse matrix

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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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