1
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
An overhead line having a surge impedance of $$400$$$$\Omega $$ is connected in series with an underground cable having a surge impedance of $$100$$$$\Omega $$. If a surge of $$50$$ $$kV$$ travels from the line end towards the cable junctions, the value of the transmitted voltage wave at the junction is
A
$$30$$ kV
B
$$20$$ kV
C
$$80$$ kV
D
$$-30$$ kV
2
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
The load carrying capability of a long AC transmission line is
A
Always limited by the conductor size
B
Limited by stability considerations.
C
Reduced at a low ambient temperatures.
D
Decreased by the use of bundled conductors of single conductors.
3
GATE EE 1999
MCQ (Single Correct Answer)
+2
-0.6
For a single phase overhead line having solid copper conductors of diameter $$1$$ cm, spaced $$60$$ cm between centers, the inductance in $$mH/km$$ is
A
$$0.05+0.2$$ $$ln$$ $$60$$
B
$$0.2$$ $$ln$$ $$60$$
C
$$0.05+0.2$$ $$ln$$ $$(60/0.5)$$
D
$$0.2$$ $$ln$$ $$(60/0.5)$$
4
GATE EE 1999
MCQ (Single Correct Answer)
+2
-0.6
A 3-phase, 11 kV, 50 Hz, 200 kW load has a power factor of 0.8 lag. A delta connected 3-phase capacitor is used to improve the power factor to unity. The capacitance power phase of the capacitor in micro-farads is
A
3.948
B
1.316
C
0.439
D
11.844
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