Understanding Load kVA and Power Factor in Three Phase Transformers

[yecko]

Homework Statement

see pic 1-3

Relevant Equations

load kVA = load/power factor

For question 2.28, the load kVA requires the use of power factor before calculating the line current, while eg 2.7 do not. May I ask why do they have the difference of using PF or not? Thank you.

 

[NascentOxygen]

In 2.28 you are given the load in kW. In 2.27 you are given the load in kVA.