EE8402 Important Questions Transmission and Distribution
EE8402 Important Questions Transmission and Distribution Regulation 2017 Anna University free download. Transmission and Distribution Important 2 mark Questions EE8402 pdf free download.
Sample EE8402 Important Questions Transmission and Distribution:
37.Define inductance of a line.
It is defined as the loop inductance per unit length of the line .Its unit is henrys per meter. EE8402 important questions Transmission and distribution
38.Define capacitance of a line.
It is defined as shunt capacitance between the two wires per unit line length. Its unit is farads per meter.
39.What is skin effect?
The steady current when flowing through the conductor ,does not distribute uniformly, rather it has the tendency to concentrate near the surface of the conductor. This phenomenon is called skin effect. EE8402 important questions Transmission and distribution
40.Why skin effect is absent in dc system?
The steady current when flowing through a conductor distributes itself uniformly over the whole cross section of the conductor .That is why skin effect is absent in dc system.
41.What is the effect of skin effect on the resistance of the line?
Due to skin effect the effective area of cross section of the conductor through which current flow is reduced. Hence the resistance of the line is increased when ac current is flowing. EE8402 important questions Transmission and distribution
42.On what factors the skin effect depend?
Nature of the material, Diameter of the wire , Frequency and shape of the wire.
43.Define symmetrical spacing.
In 3 phase system when the line conductors are equidistant from each other then it is called symmetrical spacing. EE8402 important questions Transmission and distribution
44.What is the necessity for a double circuit line?
To reduce the inductance per phase and to increase the efficiency.
45.Mention the factors governing the inductance of a line.
Radius of the conductor and the spacing between the conductors.
46.Define a neutral plane.
It is a plane where electric field intensity and potential is zero. EE8402 important questions Transmission and distribution
47.Define proximity effect.
The alternating magnetic flux in a conductor caused by the current flowing in a neighbouring conductor gives rise to a circulating current which cause an apparent increase in the resistance of the conductor .This phenomenon is called as proximity effect.
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