1
GATE EE 2007
MCQ (Single Correct Answer)
+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
MCQ (Single Correct Answer)
+2
-0.6
The total reactance and total susceptance of a lossless overhead $$EHV$$ line, operating at $$50$$ $$Hz,$$ are given by $$0.045$$ pu and $$1.2$$ pu respectively. If the velocity of wave propagation is $$3\,\, \times \,\,{10^5}$$ km/s, then the approximate length of line is
A
$$122$$ $$km$$
B
$$172$$ $$km$$
C
$$222$$ $$km$$
D
$$272$$ $$km$$
3
GATE EE 2006
MCQ (Single Correct Answer)
+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
MCQ (Single Correct Answer)
+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
GATE EE Subjects
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