A three-phase line with an impedance of ( 0.2 + j 1.0 ) Ω / phase feeds three balanced three-phase loads connected in parallel. Load 1: Absorbs a total of 150 kW and 120 kvar. Load 2: Delta connected with an impedance of ( 15 0 − j 48 ) Ω / phase . Load 3: 120 kVA at 0.6 PF leading. If the line-to-neutral voltage at the load end of the line is 2000 v (rms), determine the magnitude of the line-to-line voltage at the source end of the line.
A three-phase line with an impedance of ( 0.2 + j 1.0 ) Ω / phase feeds three balanced three-phase loads connected in parallel. Load 1: Absorbs a total of 150 kW and 120 kvar. Load 2: Delta connected with an impedance of ( 15 0 − j 48 ) Ω / phase . Load 3: 120 kVA at 0.6 PF leading. If the line-to-neutral voltage at the load end of the line is 2000 v (rms), determine the magnitude of the line-to-line voltage at the source end of the line.
Solution Summary: The author explains the value of line to line voltage at source end and the expression for apparent power absorbed by load.
A three-phase line with an impedance of
(
0.2
+
j
1.0
)
Ω
/
phase feeds three balanced three-phase loads connected in parallel.
Load 1: Absorbs a total of 150 kW and 120 kvar.
Load 2: Delta connected with an impedance of
(
15
0
−
j
48
)
Ω
/
phase
.
Load 3: 120 kVA at 0.6 PF leading.
If the line-to-neutral voltage at the load end of the line is 2000 v (rms), determine the magnitude of the line-to-line voltage at the source end of the line.
Q2: 14/12 satellite has an elevation angle equal 70° with an altitude off 10,000 km
above the air service what impairment will happen if is height change to 8,000 km
with same velocity?
Q6/ (10 Marks)
For the system shown in Fig.3, determine the values of (K) and (a) so that the
maximum overshoot in unit-step response is (50% ) and the peak time is (5)
seconds.
R(s)
C(s)
ΟΙ
02
G3
G4
TI
Q1
H2
HI
Fig.1
A1
9 P
P1
Q2
h2'
A₂
3
9 R2
Q3
R(s)
Fig.2
K
S²
C(s)
1+ as
Fig.3
Examiner
2-2
Head of the Department
Dr. Hassanein Ibraheem
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