Power Systems
Per unit of any quantity is defined as

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

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Power Systems
ACSR means

 Aluminium core steel reinforced
 Aluminium copper steel reinforced
 Aluminium conductor steel reinforced
 all conductor steel reinforced

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 if both 2 and 3 are satisfied
 always
 if the mutual couplings between transmission lines are absent
 if the shunt admittances at the buses are ignored

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