Anna University Coimbatore 2009 B.E Electrical and Electronics Engineering / elecromagnetic theory - Question Paper

ANNA UNIVERSITY COIMBATORE
B.E./B.Tech. DEGREE EXAMINATION:DECEMBER 2009
REGULATION-2008
THIRD SEMESTER:Electrical and Electronics Engineering
080280017-ELECROMAGNETIC THEORY
Time : three hours Maximum : 100 marks
PART A — (20 * two = 40 marks)
1. describe vector and scalar field.Give an example.
2. state stroke's theorem.
3. write the matrix formula for convering circular coordinate into cartesian coordinate
4. describe unit vecto.
5. state coulomb's legal regulations
6. write any 2 application of Gauss's mlaw.
7. describe the energy density.
8. write the formula for capacitance of co axial cable.
9. state Ampere's legal regulations
10.what is meant by solenoid and toroid?
11.why flu density is called as solenoidal vector in a closed surface?
12.Give the energy relation in magnetic field.
13.state Faraday's legal regulations of electromagnetic induction.
14.write formula for transformer and motional EMF by using Faraday's legal regulations.
15.mention any 4 comparions ranging from field theory and circuit theory
16.Define mutual inductance of a coil.
17.State poyning theorem.
18.define skin depth.
19.define standing wave ratio
20.Write the wave formula in free space.

PART B — (5 * 12 = 60 marks)
21.State and verify divergence theorem for the vector A=4x i-2y^2 j+Z^2 k taken over the cube bounded by x=0,x=1,y=0,y=1.
22.derive an formula for electric field intensity of unifrmly charged wire of infinite length by using Gauss's legal regulations
23.a)state biot-savart's legal regulations of a current element and discuss it.
b)Derive an expression for inductance of a 2 wire line and also obtain the loop inductance
24.Develop Maxwell's formula in differential and integral forms Ampere's law,Fearday's legal regulations and Gauss"s legal regulations
25.a)How the power flow is referred by using poyning vector?Derive the formula for power flow using poyning theorem
b)Define plane waves and TEM waves
26.find an expression for magnetic field intensity'H' at the centre of a circular wire carrying a current 'I'in anti-clockwise direction.the radius of circle is 'a'and the wire is in XY plane.
27.A square coil withloop area0.01m^2 and50 turns is rotated about its axis at right angles to a uniform magnetic field B=1 Tesla.calculate the instantaneous value of the EMF induced in the coil when(i)the plane is at right angles to the field(ii) the plane is parallel to the field.
28.a)Deduce an expression for the capacitance of a parallel plate capacitor having 2 or more dielectric media
b)Obtain an expression for the energy stored in a capacitor

Attachment: anna-university-coimbatore-2009-b-e-electrical-and-electronics-engineering-695-1.txt

Earning:   Approval pending.