1
GATE EE 1999
Subjective
+5
-0
A 6.6 kV, 50 Hz single core lead sheathed cable has the following data:
Conductor diameter: 1.5 cm, length: 4 km. Internal diameter of the sheath : 3 cm
Resistivity of insulation : 1.3 $$\times$$ 1012 $$\Omega$$-m. Relative permittivity of insulation : 3.5 Calculate

(a) the insulation resistance
(b) the capacitance and
(c) the maximum electric stress in the insulation

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 1997
Subjective
+5
-0
A factory draws $$100$$ kW at $$0.7$$ p.f. lagging from a $$3$$-phase, $$11$$ kV supply. It is desired to the p.f. to $$0.95$$ lagging using series capacitors. Calculate the rating of the capacitor required.
4
GATE EE 1994
Fill in the Blanks
+5
-0
The increase in resistance due to non-uniform distribution of current in a conducto $$r$$ is known as _______effect
EXAM MAP
Medical
NEET