Three-Phase Systems in Power Applications - Engineering

Q1:

In a -connected source feeding a Y-connected load,

A each phase voltage equals the difference of the corresponding load voltages

B each phase voltage equals the corresponding load voltage

C each phase voltage is one-third the corresponding load voltage

D each phase voltage is 60° out of phase with the corresponding load voltage

ANS:A - each phase voltage equals the difference of the corresponding load voltages

Tthe difference of the corresponding load voltage means:
Vab = Va - Vb.
So phase voltage is Vab.
The difference of load voltages is Va - Vb.