1
GATE EE 1998
+2
-0.6
A cable has the following characteristics. $$L = 0.201\,\,\mu H/m\,\,$$ and $$\,C = 196.2\,pF/m.\,$$ The velocity of wave propagation through the cable is
A
$$32$$ $$m/s$$
B
$$159.24$$ $$\mu /ms$$
C
$$0.0312$$ $$m/s$$
D
$$159.24$$ $$m$$/($$\mu$$-$$s$$)
2
GATE EE 1998
Subjective
+5
-0
Each conductor of a $$33$$ $$kV,$$ $$3$$ phase system is suspended by a string of three similar insulators. The ratio of shunt capacitance to mutual capacitance is $$0.1.$$ Calculate the voltage across each insulator, and the string efficiency.
3
GATE EE 1998
+2
-0.6
A power station consists of two synchronous generators A and B of ratings 250 MVA and 500 MVA with inertia constant 1.6 p.u. and 1.0 p.u., respectively on their own base MVA ratings. The equivalent p.u. inertia constant for the system on 100 MVA common base is
A
2.6
B
0.615
C
1.625
D
9.0
4
GATE EE 1998
Subjective
+5
-0
An alternator is connected to an infinite bus as shown in figure. It delivers 1.0 p.u. current at 0.8 p.f lagging at V = 1.0 p.u.. The reactance Xd of the alternator is 1.2 p.u. Determine the active power output and the steady state power limit. Keeping the active power fixed, if the excitation is reduced, find the critical excitation corresponding to operation at stability limit. GATE EE Papers
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Joint Entrance Examination