Figure 2.26 shows three loads connected in parallel across a 1 000 -V ( RMS ) , 6 0 − Hz single-phase source. Load 1: Inductive load, 125 kVA , 0. 28PF lagging. Load 2: Capacitive load, 1 0 kW , 4 0 kvar . Load 3: Resistive load, 15 kW . (a) Determine the total kW, kvar, kva, and supply power factor. (b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in μ F . Comment on the magnitude of the supply current after adding the capacitor.
Figure 2.26 shows three loads connected in parallel across a 1 000 -V ( RMS ) , 6 0 − Hz single-phase source. Load 1: Inductive load, 125 kVA , 0. 28PF lagging. Load 2: Capacitive load, 1 0 kW , 4 0 kvar . Load 3: Resistive load, 15 kW . (a) Determine the total kW, kvar, kva, and supply power factor. (b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in μ F . Comment on the magnitude of the supply current after adding the capacitor.
Figure 2.26 shows three loads connected in parallel across a
1
000
-V
(
RMS
)
,
6
0
−
Hz
single-phase source.
Load 1: Inductive load,
125 kVA
,
0.
28PF
lagging.
Load 2: Capacitive load,
1
0
kW
,
4
0
kvar
.
Load 3: Resistive load,
15
kW
.
(a) Determine the total kW, kvar, kva, and supply power factor.
(b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in
μ
F
.
Comment on the magnitude of the supply current after adding the capacitor.
f. The figure below shows two stage RC coupled amplifier. If the input resistance Rin
of each stage is 1kN. (B = 100). Determine its overall voltage gain. (5 marks)
+15V
ΣΚΩ
kn
10kΩ
10ΚΩ
output
35 ΚΩ
2ΚΩ
5kЛ
2ΚΩ
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