December 2020
Intermediate to advanced
545 pages
15h 57m
English
book
Modern Power System Analysis with MATLAB® Applications by Pearson
by R. Jegatheesan, K. Vijayakumar
Content preview from Modern Power System Analysis with MATLAB® Applications by Pearson
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Modern Power System Analysis with MATLAB Applications
34
7. Corresponding to a load power of (P
L
+ j Q
L
) per-unit and a load voltage of V
L
per-unit, the
per-unit load impedance is
(a)
PjQ
V
LL
−
2
(b)
PjQ
V
LL
+
2
(c)
V
Pj
Q
L
LL
2
+
(d)
V
PjQ
L
LL
2
−
8. For an alternator in a three-phase system, base MVA is 100 and base voltage is 20 kV.
Determine its base current.
(a) 5,000 A (b)
3
×
5,000 A
(c)
3
×
5 A (d)
5 000
3
,
A
9. An alternator in a three-phase system has a reactance of 0.15 per-unit. When its terminal volt-
age is 0.9
∠
0° per-unit, it supplies a current of 0.5
∠
-36.87° per-unit. It’s internal voltageis
(a) (0.945 + j 0.06) per-unit (b) (0.855 – j 0.06) ...
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