Consider
the following quantities :
1.
Real power
2.
Reactive power
3.
Power factor
4.
Input current
5.
Bus voltage magnitude
6.
Bus voltage phase-angle
For
the purpose of the load flow studies of a power system, each bus or node is
associated with which one of the combination of the above four quantities?
1,3,4
and 5
1,2,
3 and 4
2, 3, 5 and 6
1,2,
5 and 6
1,2,
5 and 6
At
any bus of the system, these are four variables 
.
In
a load flow two out of the four quantities are specified and the remaining two
are required to obtained through the solution of the equation.
Hence,
the correct option is (D).
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