Printed Pages: 02
Paper Id: 131412
Sub Code: REC402
--- Content provided by FirstRanker.com ---
Roll No.
B. TECH
(SEM-IV) THEORY EXAMINATION 2017-18
ELECTROMAGNETIC FIELD THEORY
Time: 3 Hours
--- Content provided by FirstRanker.com ---
Max. Marks: 70
Note: Be precise in your answer. In case of numerical problem assume data wherever not provided
SECTION – A
- Attempt all parts of the following questions: 2×7=14
- Write the Poisson's and Laplace equation.
- State point form of ohms law & Gauss's law.
- Explain Biot-Savart's Law.
- Give Maxwell's equations in differential and integral form.
- Give applications of Smith chart.
- Transform the point P(5,3,6) in cylindrical coordinate system.
- Explain Faraday's law.
--- Content provided by FirstRanker.com ---
--- Content provided by FirstRanker.com ---
SECTION – B
- Attempt any three parts of the following questions: 3×7=21
- Calculate the capacitance formed by two back to back cones separated by infinitely small distance.
- State and derive ampere circuital law. A single turn circle coil of 50 meters in diameter carries current 28 > 104 Amp. Determine the magnetic field intensity H at a point on the axis of coil and 100 meters from the coil. The relative permeability of free space surrounding the coil is unity.
- Prove that magneto static energy is given by
Wm = 1/2 ? B·H dv. - Determine the magnetic flux density B at a distance d meter from an infinite straight wire carrying current I. Also find out when the length of the wire is semi-infinite.
- A uniform plane wave propagating in good conductor. If the magnetic field intensity is given by H = 0.1e-15 cos(2p × 108t – 15z) i A/m, determine the conductivity and corresponding component of E field. Also calculate the average power loss in a block of unit area and thickness t.
--- Content provided by FirstRanker.com ---
SECTION C
- Attempt any One part of the following questions: 7×1=7
- State and explain Maxwell's equations for time varying fields in differential and integral forms and their significance.
- (i) Find the divergence of a vector A = 8x2ix + 5x2y2iy + xyz3iz and del ? of a scalar function x2yz.
(ii) Describe the gradient of a scalar field.
--- Content provided by FirstRanker.com ---
- Attempt any One part of the following questions: 7×1=7
- Point charges Q1 = 1nC, Q2 = -2nC, Q3 = 3nC and Q4 = -4nC are positioned one at a time in that order at (0,0,0), (1,0,0), (0,0,-1) and (0,0,1) respectively. Calculate the energy in the system after each charge is positioned.
- Explain Skin effect. Derive the expression for a and ß in a conducting medium.
- Attempt any One part of the following questions: 7×1=7
- Define propagation constant and characteristic Impedance. Derive the boundary conditions for electric field between two dielectrics having different permittivity interfaces.
- State Poynting theorem. Derive the mathematical expression for Poynting theorem.
--- Content provided by FirstRanker.com ---
- Attempt any One part of the following questions: 7×1=7
- A transmission line operating at 500 MHz has zo = 80 O, a = 0.04 NP/m, ß= 1.5 rad/m. Find the line parameters R, L, G, C.
- Explain the phenomena of polarization and its types.
- Attempt any One part part of the following questions: 7×1=7
- Find the potential function and electric field intensity for the region between two concentric right circular cylinders where V=V0 at r=a and V=0 at r=b (b>a)?
- Explain the reflection of plane wave for normal incidence. Discuss about Reflection and transmission coefficient for E and H.
--- Content provided by FirstRanker.com ---
For more, visit: FirstRanker.com
--- Content provided by FirstRanker.com ---
This download link is referred from the post: AKTU B-Tech Last 10 Years 2010-2020 Previous Question Papers || Dr. A.P.J. Abdul Kalam Technical University