1
GATE EE 2007
+2
-0.6
$$230$$ $$V$$ (phase) $$50$$ Hz, three-phase, $$4$$-wire, system has a sequence $$ABC$$. A unity power-factor load of $$4$$ kW is connected between phase A and neutral $$N$$. It is desired to achieve zero neutral current through the use of a pure inductor and pure capacitor in the other two phases. The Value of inductor and capacitor is......
A
$$72.95$$ $$mH$$ in phase $$C$$ & $$139.02$$ $$\mu F$$ in Phase $$B$$
B
$$72.95$$ $$mH$$ in Phase $$B$$ & $$139.02$$ $$\mu F$$ in Phase $$C$$
C
$$42.12$$ $$mH$$ in Phase $$C$$ & $$240.79$$ $$\mu F$$ in Phase $$B$$
D
$$42.12$$ $$mH$$ in Phase $$B$$ & $$240.79$$ $$\mu F$$ in Phase $$C$$
2
GATE EE 2007
+2
-0.6
Single line diagram of a $$4$$-bus single source distribution system is shown below. Branches $${e_1},\,\,$$ $${e_2},\,\,$$ $${e_3}\,\,$$ and $${e_4}\,\,$$ have equal impedences. The load current values indicated in the figure are in per unit.

Distribution Company's policy requires radial system operation with minimum loss. This can be achieved by opening of the branch

A
$${e_1}$$
B
$${e_2}$$
C
$${e_3}$$
D
$${e_4}$$
3
GATE EE 2006
+2
-0.6
The $$A, B, C, D$$ constant of a $$220$$ $$kV$$ line are:
$$A = D = 0.94\,\angle \,10,\,\,\,B = 130\,\angle \,730,\,\,\,C = 0.001\,\angle \,900.\,\,$$ If the sending end voltage of the line for a given load delivered at nominal voltage is $$240$$ $$kV$$, the % voltage regulation of the line is
A
$$5$$
B
$$9$$
C
$$16$$
D
$$21$$
4
GATE EE 2005
+2
-0.6
At an industrial sub-station with a $$4$$ $$MW$$ load, a capacitor of $$2$$ MVAR is installed to maintain the load power factor at $$0.97$$ lagging. If the capacitor goes out of service, the load power factor becomes
A
$$0.85$$ lag
B
$$1.00$$ lag
C
$$0.80$$ lag
D
$$0.90$$ lag
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